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6.2 Draft Ref Guide Topics


This Unreleased Guide Will Cover Apache Solr 6.2

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Apache Solr includes the ability to set up a cluster of Solr servers that combines fault tolerance and high availability. Called SolrCloud, these capabilities provide distributed indexing and search capabilities, supporting the following features:

  • Central configuration for the entire cluster
  • Automatic load balancing and fail-over for queries
  • ZooKeeper integration for cluster coordination and configuration.

SolrCloud is flexible distributed search and indexing, without a master node to allocate nodes, shards and replicas. Instead, Solr uses ZooKeeper to manage these locations, depending on configuration files and schemas. Documents can be sent to any server and ZooKeeper will figure it out.

In this section, we'll cover everything you need to know about using Solr in SolrCloud mode. We've split up the details into the following topics:


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  1. HI Team,


    I have a serious problem, while using solr..I have a job which will run daily twice which is actually has 112946697 records. To process these many records solr is taking 5 to 6 hours. 

    is there any way to improve the performance of solr to process/update this much huge data ? .


    My search is returning very faster but loading this information into solr is taking more time.


    Please let me know if you need any other information like solr settings..etc.

    1. This is a terrible place to ask for tech support.  This should go on the mailing list, or the IRC channel.

      I assume this is an indexing job.  This does not seem like a problem to me.  I have an index that spreads 95 million records across six large shards and one small shard, living on two servers.  All shards run the dataimport handler in parallel, importing from a MySQL database.  A full rebuild takes about 4.5 hours ... and this is building six large indexes at the same time, taking advantage of multiple CPU cores.  The database is definitely not the bottleneck here, because I can create a program that indexes all of the records to one Solr index, and if I take out the "send to Solr" step (it still builds the SolrInputDocument object), it runs through all 95 million records in about 20 minutes.

      If you can process over 100 million records with in 5-6 hours and you have either a single index or a SolrCloud ... you do not have a performance problem, especially if the documents are a few kilobytes or larger.

      If you have additional questions, please ask this again on the mailing list or join the #solr IRC channel.

    2. Followup: You posted this on the SolrCloud page, so I have one more thing to add:  If your index is sharded and you can send your updates directly to the correct shard leader, indexing will be faster.  CloudSolrServer (in the Java client) does this automatically as of the 4.5 or 4.6 version, but if your client isn't Java, you'll have to work out which Solr instances are the correct shard leaders in your own code.

  2. Need help 

    I have configure solr for to fetch the 10 million recors and it takes 124 secons and i have make all the caching related configuration to optimise the search result in less the second so please could any one help me for that




    below is my config file 



    <?xml version="1.0" encoding="UTF-8" ?>
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements. See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License. You may obtain a copy of the License at


    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    For more details about configurations options that may appear in
    this file, see http://wiki.apache.org/solr/SolrConfigXml.
    <!-- In all configuration below, a prefix of "solr." for class names
    is an alias that causes solr to search appropriate packages,
    including org.apache.solr.(search|update|request|core|analysis)

    You may also specify a fully qualified Java classname if you
    have your own custom plugins.

    <!-- Controls what version of Lucene various components of Solr
    adhere to. Generally, you want to use the latest version to
    get all bug fixes and improvements. It is highly recommended
    that you fully re-index after changing this setting as it can
    affect both how text is indexed and queried.

    <!-- <lib/> directives can be used to instruct Solr to load any Jars
    identified and use them to resolve any "plugins" specified in
    your solrconfig.xml or schema.xml (ie: Analyzers, Request
    Handlers, etc...).

    All directories and paths are resolved relative to the

    Please note that <lib/> directives are processed in the order
    that they appear in your solrconfig.xml file, and are "stacked"
    on top of each other when building a ClassLoader - so if you have
    plugin jars with dependencies on other jars, the "lower level"
    dependency jars should be loaded first.

    If a "./lib" directory exists in your instanceDir, all files
    found in it are included as if you had used the following

    <lib dir="./lib" />

    <!-- A 'dir' option by itself adds any files found in the directory
    to the classpath, this is useful for including all jars in a

    When a 'regex' is specified in addition to a 'dir', only the
    files in that directory which completely match the regex
    (anchored on both ends) will be included.

    If a 'dir' option (with or without a regex) is used and nothing
    is found that matches, a warning will be logged.

    The examples below can be used to load some solr-contribs along
    with their external dependencies.
    <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-dataimporthandler-.*\.jar" />

    <lib dir="${solr.install.dir:../../../..}/contrib/extraction/lib" regex=".*\.jar" />
    <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-cell-\d.*\.jar" />

    <lib dir="${solr.install.dir:../../../..}/contrib/clustering/lib/" regex=".*\.jar" />
    <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-clustering-\d.*\.jar" />

    <lib dir="${solr.install.dir:../../../..}/contrib/langid/lib/" regex=".*\.jar" />
    <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-langid-\d.*\.jar" />

    <lib dir="${solr.install.dir:../../../..}/contrib/velocity/lib" regex=".*\.jar" />
    <lib dir="${solr.install.dir:../../../..}/dist/" regex="solr-velocity-\d.*\.jar" />

    <!-- an exact 'path' can be used instead of a 'dir' to specify a
    specific jar file. This will cause a serious error to be logged
    if it can't be loaded.
    <lib path="../a-jar-that-does-not-exist.jar" />

    <!-- Data Directory

    Used to specify an alternate directory to hold all index data
    other than the default ./data under the Solr home. If
    replication is in use, this should match the replication

    <!-- The DirectoryFactory to use for indexes.

    solr.StandardDirectoryFactory is filesystem
    based and tries to pick the best implementation for the current
    JVM and platform. solr.NRTCachingDirectoryFactory, the default,
    wraps solr.StandardDirectoryFactory and caches small files in memory
    for better NRT performance.

    One can force a particular implementation via solr.MMapDirectoryFactory,
    solr.NIOFSDirectoryFactory, or solr.SimpleFSDirectoryFactory.

    solr.RAMDirectoryFactory is memory based, not
    persistent, and doesn't work with replication.
    <directoryFactory name="DirectoryFactory"

    <!-- These will be used if you are using the solr.HdfsDirectoryFactory,
    otherwise they will be ignored. If you don't plan on using hdfs,
    you can safely remove this section. -->
    <!-- The root directory that collection data should be written to. -->
    <str name="solr.hdfs.home">${solr.hdfs.home:}</str>
    <!-- The hadoop configuration files to use for the hdfs client. -->
    <str name="solr.hdfs.confdir">${solr.hdfs.confdir:}</str>
    <!-- Enable/Disable the hdfs cache. -->
    <str name="solr.hdfs.blockcache.enabled">${solr.hdfs.blockcache.enabled:true}</str>
    <!-- Enable/Disable using one global cache for all SolrCores.
    The settings used will be from the first HdfsDirectoryFactory created. -->
    <str name="solr.hdfs.blockcache.global">${solr.hdfs.blockcache.global:true}</str>


    <!-- The CodecFactory for defining the format of the inverted index.
    The default implementation is SchemaCodecFactory, which is the official Lucene
    index format, but hooks into the schema to provide per-field customization of
    the postings lists and per-document values in the fieldType element
    (postingsFormat/docValuesFormat). Note that most of the alternative implementations
    are experimental, so if you choose to customize the index format, it's a good
    idea to convert back to the official format e.g. via IndexWriter.addIndexes(IndexReader)
    before upgrading to a newer version to avoid unnecessary reindexing.
    <codecFactory class="solr.SchemaCodecFactory"/>

    <!-- To enable dynamic schema REST APIs, use the following for <schemaFactory>:

    <schemaFactory class="ManagedIndexSchemaFactory">
    <bool name="mutable">true</bool>
    <str name="managedSchemaResourceName">managed-schema</str>

    When ManagedIndexSchemaFactory is specified, Solr will load the schema from
    the resource named in 'managedSchemaResourceName', rather than from schema.xml.
    Note that the managed schema resource CANNOT be named schema.xml. If the managed
    schema does not exist, Solr will create it after reading schema.xml, then rename
    'schema.xml' to 'schema.xml.bak'.

    Do NOT hand edit the managed schema - external modifications will be ignored and
    overwritten as a result of schema modification REST API calls.

    When ManagedIndexSchemaFactory is specified with mutable = true, schema
    modification REST API calls will be allowed; otherwise, error responses will be
    sent back for these requests.
    <schemaFactory class="ClassicIndexSchemaFactory"/>

    <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Index Config - These settings control low-level behavior of indexing
    Most example settings here show the default value, but are commented
    out, to more easily see where customizations have been made.

    Note: This replaces <indexDefaults> and <mainIndex> from older versions
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
    <!-- maxFieldLength was removed in 4.0. To get similar behavior, include a
    LimitTokenCountFilterFactory in your fieldType definition. E.g.
    <filter class="solr.LimitTokenCountFilterFactory" maxTokenCount="10000"/>
    <!-- Maximum time to wait for a write lock (ms) for an IndexWriter. Default: 1000 -->
    <!-- <writeLockTimeout>1000</writeLockTimeout> -->

    <!-- The maximum number of simultaneous threads that may be
    indexing documents at once in IndexWriter; if more than this
    many threads arrive they will wait for others to finish.
    Default in Solr/Lucene is 8. -->
    <!-- <maxIndexingThreads>8</maxIndexingThreads> -->

    <!-- Expert: Enabling compound file will use less files for the index,
    using fewer file descriptors on the expense of performance decrease.
    Default in Lucene is "true". Default in Solr is "false" (since 3.6) -->
    <!-- <useCompoundFile>false</useCompoundFile> -->

    <!-- ramBufferSizeMB sets the amount of RAM that may be used by Lucene
    indexing for buffering added documents and deletions before they are
    flushed to the Directory.
    maxBufferedDocs sets a limit on the number of documents buffered
    before flushing.
    If both ramBufferSizeMB and maxBufferedDocs is set, then
    Lucene will flush based on whichever limit is hit first.
    The default is 100 MB. -->

    <!-- Expert: Merge Policy
    The Merge Policy in Lucene controls how merging of segments is done.
    The default since Solr/Lucene 3.3 is TieredMergePolicy.
    The default since Lucene 2.3 was the LogByteSizeMergePolicy,
    Even older versions of Lucene used LogDocMergePolicy.
    <mergePolicy class="org.apache.lucene.index.TieredMergePolicy">
    <int name="maxMergeAtOnce">10</int>
    <int name="segmentsPerTier">10</int>

    <!-- Merge Factor
    The merge factor controls how many segments will get merged at a time.
    For TieredMergePolicy, mergeFactor is a convenience parameter which
    will set both MaxMergeAtOnce and SegmentsPerTier at once.
    For LogByteSizeMergePolicy, mergeFactor decides how many new segments
    will be allowed before they are merged into one.
    Default is 10 for both merge policies.


    <!-- Expert: Merge Scheduler
    The Merge Scheduler in Lucene controls how merges are
    performed. The ConcurrentMergeScheduler (Lucene 2.3 default)
    can perform merges in the background using separate threads.
    The SerialMergeScheduler (Lucene 2.2 default) does not.

    <mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler"/>

    <!-- LockFactory

    This option specifies which Lucene LockFactory implementation
    to use.

    single = SingleInstanceLockFactory - suggested for a
    read-only index or when there is no possibility of
    another process trying to modify the index.
    native = NativeFSLockFactory - uses OS native file locking.
    Do not use when multiple solr webapps in the same
    JVM are attempting to share a single index.
    simple = SimpleFSLockFactory - uses a plain file for locking

    Defaults: 'native' is default for Solr3.6 and later, otherwise
    'simple' is the default

    More details on the nuances of each LockFactory...

    <!-- Unlock On Startup

    If true, unlock any held write or commit locks on startup.
    This defeats the locking mechanism that allows multiple
    processes to safely access a lucene index, and should be used
    with care. Default is "false".

    This is not needed if lock type is 'single'

    <!-- Commit Deletion Policy
    Custom deletion policies can be specified here. The class must
    implement org.apache.lucene.index.IndexDeletionPolicy.

    The default Solr IndexDeletionPolicy implementation supports
    deleting index commit points on number of commits, age of
    commit point and optimized status.

    The latest commit point should always be preserved regardless
    of the criteria.
    <deletionPolicy class="solr.SolrDeletionPolicy">
    <!-- The number of commit points to be kept -->
    <!-- <str name="maxCommitsToKeep">1</str> -->
    <!-- The number of optimized commit points to be kept -->
    <!-- <str name="maxOptimizedCommitsToKeep">0</str> -->
    Delete all commit points once they have reached the given age.
    Supports DateMathParser syntax e.g.
    <str name="maxCommitAge">30MINUTES</str>
    <str name="maxCommitAge">1DAY</str>

    <!-- Lucene Infostream

    To aid in advanced debugging, Lucene provides an "InfoStream"
    of detailed information when indexing.

    Setting the value to true will instruct the underlying Lucene
    IndexWriter to write its info stream to solr's log. By default,
    this is enabled here, and controlled through log4j.properties.

    <!-- JMX

    This example enables JMX if and only if an existing MBeanServer
    is found, use this if you want to configure JMX through JVM
    parameters. Remove this to disable exposing Solr configuration
    and statistics to JMX.

    For more details see http://wiki.apache.org/solr/SolrJmx
    <jmx />
    <!-- If you want to connect to a particular server, specify the
    <!-- <jmx agentId="myAgent" /> -->
    <!-- If you want to start a new MBeanServer, specify the serviceUrl -->
    <!-- <jmx serviceUrl="service:jmx:rmi:///jndi/rmi://localhost:9999/solr"/>

    <!-- The default high-performance update handler -->
    <updateHandler class="solr.DirectUpdateHandler2">

    <!-- Enables a transaction log, used for real-time get, durability, and
    and solr cloud replica recovery. The log can grow as big as
    uncommitted changes to the index, so use of a hard autoCommit
    is recommended (see below).
    "dir" - the target directory for transaction logs, defaults to the
    solr data directory. -->
    <str name="dir">${solr.ulog.dir:}</str>

    <!-- AutoCommit

    Perform a hard commit automatically under certain conditions.
    Instead of enabling autoCommit, consider using "commitWithin"
    when adding documents.


    maxDocs - Maximum number of documents to add since the last
    commit before automatically triggering a new commit.

    maxTime - Maximum amount of time in ms that is allowed to pass
    since a document was added before automatically
    triggering a new commit.
    openSearcher - if false, the commit causes recent index changes
    to be flushed to stable storage, but does not cause a new
    searcher to be opened to make those changes visible.

    If the updateLog is enabled, then it's highly recommended to
    have some sort of hard autoCommit to limit the log size.

    <!-- softAutoCommit is like autoCommit except it causes a
    'soft' commit which only ensures that changes are visible
    but does not ensure that data is synced to disk. This is
    faster and more near-realtime friendly than a hard commit.


    <!-- Update Related Event Listeners

    Various IndexWriter related events can trigger Listeners to
    take actions.

    postCommit - fired after every commit or optimize command
    postOptimize - fired after every optimize command
    <!-- The RunExecutableListener executes an external command from a
    hook such as postCommit or postOptimize.

    exe - the name of the executable to run
    dir - dir to use as the current working directory. (default=".")
    wait - the calling thread waits until the executable returns.
    args - the arguments to pass to the program. (default is none)
    env - environment variables to set. (default is none)
    <!-- This example shows how RunExecutableListener could be used
    with the script based replication...
    <listener event="postCommit" class="solr.RunExecutableListener">
    <str name="exe">solr/bin/snapshooter</str>
    <str name="dir">.</str>
    <bool name="wait">true</bool>
    <arr name="args"> <str>arg1</str> <str>arg2</str> </arr>
    <arr name="env"> <str>MYVAR=val1</str> </arr>


    <!-- IndexReaderFactory

    Use the following format to specify a custom IndexReaderFactory,
    which allows for alternate IndexReader implementations.

    ** Experimental Feature **

    Please note - Using a custom IndexReaderFactory may prevent
    certain other features from working. The API to
    IndexReaderFactory may change without warning or may even be
    removed from future releases if the problems cannot be

    ** Features that may not work with custom IndexReaderFactory **

    The ReplicationHandler assumes a disk-resident index. Using a
    custom IndexReader implementation may cause incompatibility
    with ReplicationHandler and may cause replication to not work
    correctly. See SOLR-1366 for details.

    <indexReaderFactory name="IndexReaderFactory" class="package.class">
    <str name="someArg">Some Value</str>
    </indexReaderFactory >

    <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Query section - these settings control query time things like caches
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
    <!-- Max Boolean Clauses

    Maximum number of clauses in each BooleanQuery, an exception
    is thrown if exceeded.

    ** WARNING **

    This option actually modifies a global Lucene property that
    will affect all SolrCores. If multiple solrconfig.xml files
    disagree on this property, the value at any given moment will
    be based on the last SolrCore to be initialized.


    <!-- Solr Internal Query Caches

    There are two implementations of cache available for Solr,
    LRUCache, based on a synchronized LinkedHashMap, and
    FastLRUCache, based on a ConcurrentHashMap.

    FastLRUCache has faster gets and slower puts in single
    threaded operation and thus is generally faster than LRUCache
    when the hit ratio of the cache is high (> 75%), and may be
    faster under other scenarios on multi-cpu systems.

    <!-- Filter Cache

    Cache used by SolrIndexSearcher for filters (DocSets),
    unordered sets of *all* documents that match a query. When a
    new searcher is opened, its caches may be prepopulated or
    "autowarmed" using data from caches in the old searcher.
    autowarmCount is the number of items to prepopulate. For
    LRUCache, the autowarmed items will be the most recently
    accessed items.

    class - the SolrCache implementation LRUCache or
    (LRUCache or FastLRUCache)
    size - the maximum number of entries in the cache
    initialSize - the initial capacity (number of entries) of
    the cache. (see java.util.HashMap)
    autowarmCount - the number of entries to prepopulate from
    and old cache.
    <filterCache class="solr.FastLRUCache"

    <!-- Query Result Cache

    Caches results of searches - ordered lists of document ids
    (DocList) based on a query, a sort, and the range of documents requested.
    <queryResultCache class="solr.FastLRUCache"

    <!-- Document Cache

    Caches Lucene Document objects (the stored fields for each
    document). Since Lucene internal document ids are transient,
    this cache will not be autowarmed.
    <documentCache class="solr.FastLRUCache"

    <!-- custom cache currently used by block join -->
    <cache name="perSegFilter"
    regenerator="solr.NoOpRegenerator" />

    <!-- Field Value Cache

    Cache used to hold field values that are quickly accessible
    by document id. The fieldValueCache is created by default
    even if not configured here.
    <fieldValueCache class="solr.FastLRUCache"
    showItems="32" />

    <!-- Custom Cache

    Example of a generic cache. These caches may be accessed by
    name through SolrIndexSearcher.getCache(),cacheLookup(), and
    cacheInsert(). The purpose is to enable easy caching of
    user/application level data. The regenerator argument should
    be specified as an implementation of solr.CacheRegenerator
    if autowarming is desired.
    <cache name="myUserCache"

    <!-- Lazy Field Loading

    If true, stored fields that are not requested will be loaded
    lazily. This can result in a significant speed improvement
    if the usual case is to not load all stored fields,
    especially if the skipped fields are large compressed text

    <!-- Use Filter For Sorted Query

    A possible optimization that attempts to use a filter to
    satisfy a search. If the requested sort does not include
    score, then the filterCache will be checked for a filter
    matching the query. If found, the filter will be used as the
    source of document ids, and then the sort will be applied to

    For most situations, this will not be useful unless you
    frequently get the same search repeatedly with different sort
    options, and none of them ever use "score"

    <!-- Result Window Size

    An optimization for use with the queryResultCache. When a search
    is requested, a superset of the requested number of document ids
    are collected. For example, if a search for a particular query
    requests matching documents 10 through 19, and queryWindowSize is 50,
    then documents 0 through 49 will be collected and cached. Any further
    requests in that range can be satisfied via the cache.

    <!-- Maximum number of documents to cache for any entry in the

    <!-- Query Related Event Listeners

    Various IndexSearcher related events can trigger Listeners to
    take actions.

    newSearcher - fired whenever a new searcher is being prepared
    and there is a current searcher handling requests (aka
    registered). It can be used to prime certain caches to
    prevent long request times for certain requests.

    firstSearcher - fired whenever a new searcher is being
    prepared but there is no current registered searcher to handle
    requests or to gain autowarming data from.

    <!-- QuerySenderListener takes an array of NamedList and executes a
    local query request for each NamedList in sequence.
    <listener event="newSearcher" class="solr.QuerySenderListener">
    <arr name="queries">
    <lst><str name="q">solr</str><str name="sort">price asc</str></lst>
    <lst><str name="q">rocks</str><str name="sort">weight asc</str></lst>
    <listener event="firstSearcher" class="solr.QuerySenderListener">
    <arr name="queries">
    <str name="q">static firstSearcher warming in solrconfig.xml</str>

    <!-- Use Cold Searcher

    If a search request comes in and there is no current
    registered searcher, then immediately register the still
    warming searcher and use it. If "false" then all requests
    will block until the first searcher is done warming.

    <!-- Max Warming Searchers

    Maximum number of searchers that may be warming in the
    background concurrently. An error is returned if this limit
    is exceeded.

    Recommend values of 1-2 for read-only slaves, higher for
    masters w/o cache warming.


    <!-- Request Dispatcher

    This section contains instructions for how the SolrDispatchFilter
    should behave when processing requests for this SolrCore.

    handleSelect is a legacy option that affects the behavior of requests
    such as /select?qt=XXX

    handleSelect="true" will cause the SolrDispatchFilter to process
    the request and dispatch the query to a handler specified by the
    "qt" param, assuming "/select" isn't already registered.

    handleSelect="false" will cause the SolrDispatchFilter to
    ignore "/select" requests, resulting in a 404 unless a handler
    is explicitly registered with the name "/select"

    handleSelect="true" is not recommended for new users, but is the default
    for backwards compatibility
    <requestDispatcher handleSelect="false" >
    <!-- Request Parsing

    These settings indicate how Solr Requests may be parsed, and
    what restrictions may be placed on the ContentStreams from
    those requests

    enableRemoteStreaming - enables use of the stream.file
    and stream.url parameters for specifying remote streams.

    multipartUploadLimitInKB - specifies the max size (in KiB) of
    Multipart File Uploads that Solr will allow in a Request.

    formdataUploadLimitInKB - specifies the max size (in KiB) of
    form data (application/x-www-form-urlencoded) sent via
    POST. You can use POST to pass request parameters not
    fitting into the URL.

    addHttpRequestToContext - if set to true, it will instruct
    the requestParsers to include the original HttpServletRequest
    object in the context map of the SolrQueryRequest under the
    key "httpRequest". It will not be used by any of the existing
    Solr components, but may be useful when developing custom

    *** WARNING ***
    The settings below authorize Solr to fetch remote files, You
    should make sure your system has some authentication before
    using enableRemoteStreaming="true"

    <requestParsers enableRemoteStreaming="true"

    <!-- HTTP Caching

    Set HTTP caching related parameters (for proxy caches and clients).

    The options below instruct Solr not to output any HTTP Caching
    related headers
    <httpCaching never304="true" />
    <!-- If you include a <cacheControl> directive, it will be used to
    generate a Cache-Control header (as well as an Expires header
    if the value contains "max-age=")

    By default, no Cache-Control header is generated.

    You can use the <cacheControl> option even if you have set
    <httpCaching never304="true" >
    <cacheControl>max-age=30, public</cacheControl>
    <!-- To enable Solr to respond with automatically generated HTTP
    Caching headers, and to response to Cache Validation requests
    correctly, set the value of never304="false"

    This will cause Solr to generate Last-Modified and ETag
    headers based on the properties of the Index.

    The following options can also be specified to affect the
    values of these headers...

    lastModFrom - the default value is "openTime" which means the
    Last-Modified value (and validation against If-Modified-Since
    requests) will all be relative to when the current Searcher
    was opened. You can change it to lastModFrom="dirLastMod" if
    you want the value to exactly correspond to when the physical
    index was last modified.

    etagSeed="..." is an option you can change to force the ETag
    header (and validation against If-None-Match requests) to be
    different even if the index has not changed (ie: when making
    significant changes to your config file)

    (lastModifiedFrom and etagSeed are both ignored if you use
    the never304="true" option)
    <httpCaching lastModifiedFrom="openTime"
    <cacheControl>max-age=30, public</cacheControl>

    <!-- Request Handlers


    Incoming queries will be dispatched to a specific handler by name
    based on the path specified in the request.

    Legacy behavior: If the request path uses "/select" but no Request
    Handler has that name, and if handleSelect="true" has been specified in
    the requestDispatcher, then the Request Handler is dispatched based on
    the qt parameter. Handlers without a leading '/' are accessed this way
    like so: http://host/app/[core/]select?qt=name If no qt is
    given, then the requestHandler that declares default="true" will be
    used or the one named "standard".

    If a Request Handler is declared with startup="lazy", then it will
    not be initialized until the first request that uses it.


    <requestHandler name="/dataimport" class="solr.DataImportHandler">
    <lst name="defaults">
    <str name="config">db-data-config.xml</str>

    <!-- SearchHandler


    For processing Search Queries, the primary Request Handler
    provided with Solr is "SearchHandler" It delegates to a sequent
    of SearchComponents (see below) and supports distributed
    queries across multiple shards
    <requestHandler name="/select" class="solr.SearchHandler">
    <!-- default values for query parameters can be specified, these
    will be overridden by parameters in the request
    <lst name="defaults">
    <str name="echoParams">explicit</str>
    <int name="rows">10</int>
    <str name="df">text</str>
    <!-- In addition to defaults, "appends" params can be specified
    to identify values which should be appended to the list of
    multi-val params from the query (or the existing "defaults").
    <!-- In this example, the param "fq=instock:true" would be appended to
    any query time fq params the user may specify, as a mechanism for
    partitioning the index, independent of any user selected filtering
    that may also be desired (perhaps as a result of faceted searching).

    NOTE: there is *absolutely* nothing a client can do to prevent these
    "appends" values from being used, so don't use this mechanism
    unless you are sure you always want it.
    <lst name="appends">
    <str name="fq">inStock:true</str>
    <!-- "invariants" are a way of letting the Solr maintainer lock down
    the options available to Solr clients. Any params values
    specified here are used regardless of what values may be specified
    in either the query, the "defaults", or the "appends" params.

    In this example, the facet.field and facet.query params would
    be fixed, limiting the facets clients can use. Faceting is
    not turned on by default - but if the client does specify
    facet=true in the request, these are the only facets they
    will be able to see counts for; regardless of what other
    facet.field or facet.query params they may specify.

    NOTE: there is *absolutely* nothing a client can do to prevent these
    "invariants" values from being used, so don't use this mechanism
    unless you are sure you always want it.
    <lst name="invariants">
    <str name="facet.field">cat</str>
    <str name="facet.field">manu_exact</str>
    <str name="facet.query">price:[* TO 500]</str>
    <str name="facet.query">price:[500 TO *]</str>
    <!-- If the default list of SearchComponents is not desired, that
    list can either be overridden completely, or components can be
    prepended or appended to the default list. (see below)
    <arr name="components">

    <!-- A request handler that returns indented JSON by default -->
    <requestHandler name="/query" class="solr.SearchHandler">
    <lst name="defaults">
    <str name="echoParams">explicit</str>
    <str name="wt">json</str>
    <str name="indent">true</str>
    <str name="df">text</str>

    <!-- realtime get handler, guaranteed to return the latest stored fields of
    any document, without the need to commit or open a new searcher. The
    current implementation relies on the updateLog feature being enabled.

    ** WARNING **
    Do NOT disable the realtime get handler at /get if you are using
    SolrCloud otherwise any leader election will cause a full sync in ALL
    replicas for the shard in question. Similarly, a replica recovery will
    also always fetch the complete index from the leader because a partial
    sync will not be possible in the absence of this handler.
    <requestHandler name="/get" class="solr.RealTimeGetHandler">
    <lst name="defaults">
    <str name="omitHeader">true</str>
    <str name="wt">json</str>
    <str name="indent">true</str>

    <!-- A Robust Example

    This example SearchHandler declaration shows off usage of the
    SearchHandler with many defaults declared

    Note that multiple instances of the same Request Handler
    (SearchHandler) can be registered multiple times with different
    names (and different init parameters)
    <requestHandler name="/browse" class="solr.SearchHandler">
    <lst name="defaults">
    <str name="echoParams">explicit</str>

    <!-- VelocityResponseWriter settings -->
    <str name="wt">velocity</str>
    <str name="v.template">browse</str>
    <str name="v.layout">layout</str>

    <!-- Query settings -->
    <str name="defType">edismax</str>
    <str name="q.alt">*:*</str>
    <str name="rows">10</str>
    <str name="fl">*,score</str>

    <!-- Faceting defaults -->
    <str name="facet">on</str>
    <str name="facet.mincount">1</str>

    <initParams path="/update/**,/query,/select,/tvrh,/elevate,/spell,/browse">
    <lst name="defaults">
    <str name="df">text</str>

    <!-- Update Request Handler.


    The canonical Request Handler for Modifying the Index through
    commands specified using XML, JSON, CSV, or JAVABIN

    Note: Since solr1.1 requestHandlers requires a valid content
    type header if posted in the body. For example, curl now
    requires: -H 'Content-type:text/xml; charset=utf-8'

    To override the request content type and force a specific
    Content-type, use the request parameter:

    This handler will pick a response format to match the input
    if the 'wt' parameter is not explicit
    <requestHandler name="/update" class="solr.UpdateRequestHandler">
    <!-- See below for information on defining
    updateRequestProcessorChains that can be used by name
    on each Update Request
    <lst name="defaults">
    <str name="update.chain">dedupe</str>


    <!-- Solr Cell Update Request Handler


    <requestHandler name="/update/extract"
    class="solr.extraction.ExtractingRequestHandler" >
    <lst name="defaults">
    <str name="lowernames">true</str>
    <str name="uprefix">ignored_</str>

    <!-- capture link hrefs but ignore div attributes -->
    <str name="captureAttr">true</str>
    <str name="fmap.a">links</str>
    <str name="fmap.div">ignored_</str>

    <!-- Field Analysis Request Handler

    RequestHandler that provides much the same functionality as
    analysis.jsp. Provides the ability to specify multiple field
    types and field names in the same request and outputs
    index-time and query-time analysis for each of them.

    Request parameters are:
    analysis.fieldname - field name whose analyzers are to be used

    analysis.fieldtype - field type whose analyzers are to be used
    analysis.fieldvalue - text for index-time analysis
    q (or analysis.q) - text for query time analysis
    analysis.showmatch (true|false) - When set to true and when
    query analysis is performed, the produced tokens of the
    field value analysis will be marked as "matched" for every
    token that is produces by the query analysis
    <requestHandler name="/analysis/field"
    class="solr.FieldAnalysisRequestHandler" />

    <!-- Document Analysis Handler


    An analysis handler that provides a breakdown of the analysis
    process of provided documents. This handler expects a (single)
    content stream with the following format:

    <field name="id">1</field>
    <field name="name">The Name</field>
    <field name="text">The Text Value</field>

    Note: Each document must contain a field which serves as the
    unique key. This key is used in the returned response to associate
    an analysis breakdown to the analyzed document.

    Like the FieldAnalysisRequestHandler, this handler also supports
    query analysis by sending either an "analysis.query" or "q"
    request parameter that holds the query text to be analyzed. It
    also supports the "analysis.showmatch" parameter which when set to
    true, all field tokens that match the query tokens will be marked
    as a "match".
    <requestHandler name="/analysis/document"
    startup="lazy" />

    <!-- Admin Handlers

    Admin Handlers - This will register all the standard admin
    <requestHandler name="/admin/"
    class="solr.admin.AdminHandlers" />
    <!-- This single handler is equivalent to the following... -->
    <requestHandler name="/admin/luke" class="solr.admin.LukeRequestHandler" />
    <requestHandler name="/admin/system" class="solr.admin.SystemInfoHandler" />
    <requestHandler name="/admin/plugins" class="solr.admin.PluginInfoHandler" />
    <requestHandler name="/admin/threads" class="solr.admin.ThreadDumpHandler" />
    <requestHandler name="/admin/properties" class="solr.admin.PropertiesRequestHandler" />
    <requestHandler name="/admin/file" class="solr.admin.ShowFileRequestHandler" >
    <!-- If you wish to hide files under ${solr.home}/conf, explicitly
    register the ShowFileRequestHandler using the definition below.
    NOTE: The glob pattern ('*') is the only pattern supported at present, *.xml will
    not exclude all files ending in '.xml'. Use it to exclude _all_ updates
    <requestHandler name="/admin/file"
    class="solr.admin.ShowFileRequestHandler" >
    <lst name="invariants">
    <str name="hidden">synonyms.txt</str>
    <str name="hidden">anotherfile.txt</str>
    <str name="hidden">*</str>

    Enabling this request handler (which is NOT a default part of the admin handler) will allow the Solr UI to edit
    all the config files. This is intended for secure/development use ONLY! Leaving available and publically
    accessible is a security vulnerability and should be done with extreme caution!
    <requestHandler name="/admin/fileedit" class="solr.admin.EditFileRequestHandler" >
    <lst name="invariants">
    <str name="hidden">synonyms.txt</str>
    <str name="hidden">anotherfile.txt</str>
    <!-- ping/healthcheck -->
    <requestHandler name="/admin/ping" class="solr.PingRequestHandler">
    <lst name="invariants">
    <str name="q">solrpingquery</str>
    <lst name="defaults">
    <str name="echoParams">all</str>
    <!-- An optional feature of the PingRequestHandler is to configure the
    handler with a "healthcheckFile" which can be used to enable/disable
    the PingRequestHandler.
    relative paths are resolved against the data dir
    <!-- <str name="healthcheckFile">server-enabled.txt</str> -->

    <!-- Echo the request contents back to the client -->
    <requestHandler name="/debug/dump" class="solr.DumpRequestHandler" >
    <lst name="defaults">
    <str name="echoParams">explicit</str>
    <str name="echoHandler">true</str>

    <!-- Solr Replication

    The SolrReplicationHandler supports replicating indexes from a
    "master" used for indexing and "slaves" used for queries.


    It is also necessary for SolrCloud to function (in Cloud mode, the
    replication handler is used to bulk transfer segments when nodes
    are added or need to recover).

    <requestHandler name="/replication" class="solr.ReplicationHandler" >
    To enable simple master/slave replication, uncomment one of the
    sections below, depending on whether this solr instance should be
    the "master" or a "slave". If this instance is a "slave" you will
    also need to fill in the masterUrl to point to a real machine.
    <lst name="master">
    <str name="replicateAfter">commit</str>
    <str name="replicateAfter">startup</str>
    <str name="confFiles">schema.xml,stopwords.txt</str>
    <lst name="slave">
    <str name="masterUrl">http://your-master-hostname:8983/solr</str>
    <str name="pollInterval">00:00:60</str>

    <!-- Search Components

    Search components are registered to SolrCore and used by
    instances of SearchHandler (which can access them by name)

    By default, the following components are available:

    <searchComponent name="query" class="solr.QueryComponent" />
    <searchComponent name="facet" class="solr.FacetComponent" />
    <searchComponent name="mlt" class="solr.MoreLikeThisComponent" />
    <searchComponent name="highlight" class="solr.HighlightComponent" />
    <searchComponent name="stats" class="solr.StatsComponent" />
    <searchComponent name="debug" class="solr.DebugComponent" />

    Default configuration in a requestHandler would look like:

    <arr name="components">

    If you register a searchComponent to one of the standard names,
    that will be used instead of the default.

    To insert components before or after the 'standard' components, use:

    <arr name="first-components">

    <arr name="last-components">

    NOTE: The component registered with the name "debug" will
    always be executed after the "last-components"


    <!-- Spell Check

    The spell check component can return a list of alternative spelling

    <searchComponent name="spellcheck" class="solr.SpellCheckComponent">

    <str name="queryAnalyzerFieldType">text_general</str>

    <!-- Multiple "Spell Checkers" can be declared and used by this

    <!-- a spellchecker built from a field of the main index -->
    <lst name="spellchecker">
    <str name="name">default</str>
    <str name="field">text</str>
    <str name="classname">solr.DirectSolrSpellChecker</str>
    <!-- the spellcheck distance measure used, the default is the internal levenshtein -->
    <str name="distanceMeasure">internal</str>
    <!-- minimum accuracy needed to be considered a valid spellcheck suggestion -->
    <float name="accuracy">0.5</float>
    <!-- the maximum #edits we consider when enumerating terms: can be 1 or 2 -->
    <int name="maxEdits">2</int>
    <!-- the minimum shared prefix when enumerating terms -->
    <int name="minPrefix">1</int>
    <!-- maximum number of inspections per result. -->
    <int name="maxInspections">5</int>
    <!-- minimum length of a query term to be considered for correction -->
    <int name="minQueryLength">4</int>
    <!-- maximum threshold of documents a query term can appear to be considered for correction -->
    <float name="maxQueryFrequency">0.01</float>
    <!-- uncomment this to require suggestions to occur in 1% of the documents
    <float name="thresholdTokenFrequency">.01</float>

    <!-- a spellchecker that can break or combine words. See "/spell" handler below for usage -->
    <lst name="spellchecker">
    <str name="name">wordbreak</str>
    <str name="classname">solr.WordBreakSolrSpellChecker</str>
    <str name="field">name</str>
    <str name="combineWords">true</str>
    <str name="breakWords">true</str>
    <int name="maxChanges">10</int>

    <!-- a spellchecker that uses a different distance measure -->
    <lst name="spellchecker">
    <str name="name">jarowinkler</str>
    <str name="field">spell</str>
    <str name="classname">solr.DirectSolrSpellChecker</str>
    <str name="distanceMeasure">

    <!-- a spellchecker that use an alternate comparator

    comparatorClass be one of:
    1. score (default)
    2. freq (Frequency first, then score)
    3. A fully qualified class name
    <lst name="spellchecker">
    <str name="name">freq</str>
    <str name="field">lowerfilt</str>
    <str name="classname">solr.DirectSolrSpellChecker</str>
    <str name="comparatorClass">freq</str>

    <!-- A spellchecker that reads the list of words from a file -->
    <lst name="spellchecker">
    <str name="classname">solr.FileBasedSpellChecker</str>
    <str name="name">file</str>
    <str name="sourceLocation">spellings.txt</str>
    <str name="characterEncoding">UTF-8</str>
    <str name="spellcheckIndexDir">spellcheckerFile</str>

    <!-- A request handler for demonstrating the spellcheck component.

    NOTE: This is purely as an example. The whole purpose of the
    SpellCheckComponent is to hook it into the request handler that
    handles your normal user queries so that a separate request is
    not needed to get suggestions.


    See http://wiki.apache.org/solr/SpellCheckComponent for details
    on the request parameters.
    <requestHandler name="/spell" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
    <str name="df">text</str>
    <!-- Solr will use suggestions from both the 'default' spellchecker
    and from the 'wordbreak' spellchecker and combine them.
    collations (re-written queries) can include a combination of
    corrections from both spellcheckers -->
    <str name="spellcheck.dictionary">default</str>
    <str name="spellcheck.dictionary">wordbreak</str>
    <str name="spellcheck">on</str>
    <str name="spellcheck.extendedResults">true</str>
    <str name="spellcheck.count">10</str>
    <str name="spellcheck.alternativeTermCount">5</str>
    <str name="spellcheck.maxResultsForSuggest">5</str>
    <str name="spellcheck.collate">true</str>
    <str name="spellcheck.collateExtendedResults">true</str>
    <str name="spellcheck.maxCollationTries">10</str>
    <str name="spellcheck.maxCollations">5</str>
    <arr name="last-components">

    <searchComponent name="suggest" class="solr.SuggestComponent">
    <lst name="suggester">
    <str name="name">mySuggester</str>
    <str name="lookupImpl">FuzzyLookupFactory</str> <!-- org.apache.solr.spelling.suggest.fst -->
    <str name="dictionaryImpl">DocumentDictionaryFactory</str> <!-- org.apache.solr.spelling.suggest.HighFrequencyDictionaryFactory -->
    <str name="field">cat</str>
    <str name="weightField">price</str>
    <str name="suggestAnalyzerFieldType">string</str>

    <requestHandler name="/suggest" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
    <str name="suggest">true</str>
    <str name="suggest.count">10</str>
    <arr name="components">
    <!-- Term Vector Component

    <searchComponent name="tvComponent" class="solr.TermVectorComponent"/>

    <!-- A request handler for demonstrating the term vector component

    This is purely as an example.

    In reality you will likely want to add the component to your
    already specified request handlers.
    <requestHandler name="/tvrh" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
    <str name="df">text</str>
    <bool name="tv">true</bool>
    <arr name="last-components">

    <!-- Clustering Component

    You'll need to set the solr.clustering.enabled system property
    when running solr to run with clustering enabled:

    java -Dsolr.clustering.enabled=true -jar start.jar

    <searchComponent name="clustering"
    class="solr.clustering.ClusteringComponent" >
    <lst name="engine">
    <str name="name">lingo</str>

    <!-- Class name of a clustering algorithm compatible with the Carrot2 framework.

    Currently available open source algorithms are:
    * org.carrot2.clustering.lingo.LingoClusteringAlgorithm
    * org.carrot2.clustering.stc.STCClusteringAlgorithm
    * org.carrot2.clustering.kmeans.BisectingKMeansClusteringAlgorithm

    See http://project.carrot2.org/algorithms.html for more information.

    A commercial algorithm Lingo3G (needs to be installed separately) is defined as:
    * com.carrotsearch.lingo3g.Lingo3GClusteringAlgorithm
    <str name="carrot.algorithm">org.carrot2.clustering.lingo.LingoClusteringAlgorithm</str>

    <!-- Override location of the clustering algorithm's resources
    (attribute definitions and lexical resources).

    A directory from which to load algorithm-specific stop words,
    stop labels and attribute definition XMLs.

    For an overview of Carrot2 lexical resources, see:

    For an overview of Lingo3G lexical resources, see:
    <str name="carrot.resourcesDir">clustering/carrot2</str>

    <!-- An example definition for the STC clustering algorithm. -->
    <lst name="engine">
    <str name="name">stc</str>
    <str name="carrot.algorithm">org.carrot2.clustering.stc.STCClusteringAlgorithm</str>

    <!-- An example definition for the bisecting kmeans clustering algorithm. -->
    <lst name="engine">
    <str name="name">kmeans</str>
    <str name="carrot.algorithm">org.carrot2.clustering.kmeans.BisectingKMeansClusteringAlgorithm</str>

    <!-- A request handler for demonstrating the clustering component

    This is purely as an example.

    In reality you will likely want to add the component to your
    already specified request handlers.
    <requestHandler name="/clustering"
    <lst name="defaults">
    <bool name="clustering">true</bool>
    <bool name="clustering.results">true</bool>
    <!-- Field name with the logical "title" of a each document (optional) -->
    <str name="carrot.title">name</str>
    <!-- Field name with the logical "URL" of a each document (optional) -->
    <str name="carrot.url">id</str>
    <!-- Field name with the logical "content" of a each document (optional) -->
    <str name="carrot.snippet">features</str>
    <!-- Apply highlighter to the title/ content and use this for clustering. -->
    <bool name="carrot.produceSummary">true</bool>
    <!-- the maximum number of labels per cluster -->
    <!--<int name="carrot.numDescriptions">5</int>-->
    <!-- produce sub clusters -->
    <bool name="carrot.outputSubClusters">false</bool>

    <!-- Configure the remaining request handler parameters. -->
    <str name="defType">edismax</str>
    <str name="qf">
    text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0 manu^1.1 cat^1.4
    <str name="q.alt">*:*</str>
    <str name="rows">10</str>
    <str name="fl">*,score</str>
    <arr name="last-components">

    <!-- Terms Component


    A component to return terms and document frequency of those
    <searchComponent name="terms" class="solr.TermsComponent"/>

    <!-- A request handler for demonstrating the terms component -->
    <requestHandler name="/terms" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
    <bool name="terms">true</bool>
    <bool name="distrib">false</bool>
    <arr name="components">

    <!-- Query Elevation Component


    a search component that enables you to configure the top
    results for a given query regardless of the normal lucene
    <searchComponent name="elevator" class="solr.QueryElevationComponent" >
    <!-- pick a fieldType to analyze queries -->
    <str name="queryFieldType">string</str>
    <str name="config-file">elevate.xml</str>

    <!-- A request handler for demonstrating the elevator component -->
    <requestHandler name="/elevate" class="solr.SearchHandler" startup="lazy">
    <lst name="defaults">
    <str name="echoParams">explicit</str>
    <str name="df">text</str>
    <arr name="last-components">

    <!-- Highlighting Component

    <searchComponent class="solr.HighlightComponent" name="highlight">
    <!-- Configure the standard fragmenter -->
    <!-- This could most likely be commented out in the "default" case -->
    <fragmenter name="gap"
    <lst name="defaults">
    <int name="hl.fragsize">100</int>

    <!-- A regular-expression-based fragmenter
    (for sentence extraction)
    <fragmenter name="regex"
    <lst name="defaults">
    <!-- slightly smaller fragsizes work better because of slop -->
    <int name="hl.fragsize">70</int>
    <!-- allow 50% slop on fragment sizes -->
    <float name="hl.regex.slop">0.5</float>
    <!-- a basic sentence pattern -->
    <str name="hl.regex.pattern">[-\w ,/\n\&quot;&apos;]{20,200}</str>

    <!-- Configure the standard formatter -->
    <formatter name="html"
    <lst name="defaults">
    <str name="hl.simple.pre"><![CDATA[<em>]]></str>
    <str name="hl.simple.post"><![CDATA[</em>]]></str>

    <!-- Configure the standard encoder -->
    <encoder name="html"
    class="solr.highlight.HtmlEncoder" />

    <!-- Configure the standard fragListBuilder -->
    <fragListBuilder name="simple"

    <!-- Configure the single fragListBuilder -->
    <fragListBuilder name="single"

    <!-- Configure the weighted fragListBuilder -->
    <fragListBuilder name="weighted"

    <!-- default tag FragmentsBuilder -->
    <fragmentsBuilder name="default"
    <lst name="defaults">
    <str name="hl.multiValuedSeparatorChar">/</str>

    <!-- multi-colored tag FragmentsBuilder -->
    <fragmentsBuilder name="colored"
    <lst name="defaults">
    <str name="hl.tag.pre"><![CDATA[
    <b style="background:yellow">,<b style="background:lawgreen">,
    <b style="background:aquamarine">,<b style="background:magenta">,
    <b style="background:palegreen">,<b style="background:coral">,
    <b style="background:wheat">,<b style="background:khaki">,
    <b style="background:lime">,<b style="background:deepskyblue">]]></str>
    <str name="hl.tag.post"><![CDATA[</b>]]></str>

    <boundaryScanner name="default"
    <lst name="defaults">
    <str name="hl.bs.maxScan">10</str>
    <str name="hl.bs.chars">.,!? &#9;&#10;&#13;</str>

    <boundaryScanner name="breakIterator"
    <lst name="defaults">
    <!-- type should be one of CHARACTER, WORD(default), LINE and SENTENCE -->
    <str name="hl.bs.type">WORD</str>
    <!-- language and country are used when constructing Locale object. -->
    <!-- And the Locale object will be used when getting instance of BreakIterator -->
    <str name="hl.bs.language">en</str>
    <str name="hl.bs.country">US</str>

    <!-- Update Processors

    Chains of Update Processor Factories for dealing with Update
    Requests can be declared, and then used by name in Update
    Request Processors


    <!-- Deduplication

    An example dedup update processor that creates the "id" field
    on the fly based on the hash code of some other fields. This
    example has overwriteDupes set to false since we are using the
    id field as the signatureField and Solr will maintain
    uniqueness based on that anyway.

    <updateRequestProcessorChain name="dedupe">
    <processor class="solr.processor.SignatureUpdateProcessorFactory">
    <bool name="enabled">true</bool>
    <str name="signatureField">id</str>
    <bool name="overwriteDupes">false</bool>
    <str name="fields">name,features,cat</str>
    <str name="signatureClass">solr.processor.Lookup3Signature</str>
    <processor class="solr.LogUpdateProcessorFactory" />
    <processor class="solr.RunUpdateProcessorFactory" />

    <!-- Language identification

    This example update chain identifies the language of the incoming
    documents using the langid contrib. The detected language is
    written to field language_s. No field name mapping is done.
    The fields used for detection are text, title, subject and description,
    making this example suitable for detecting languages form full-text
    rich documents injected via ExtractingRequestHandler.
    See more about langId at http://wiki.apache.org/solr/LanguageDetection
    <updateRequestProcessorChain name="langid">
    <processor class="org.apache.solr.update.processor.TikaLanguageIdentifierUpdateProcessorFactory">
    <str name="langid.fl">text,title,subject,description</str>
    <str name="langid.langField">language_s</str>
    <str name="langid.fallback">en</str>
    <processor class="solr.LogUpdateProcessorFactory" />
    <processor class="solr.RunUpdateProcessorFactory" />

    <!-- Script update processor

    This example hooks in an update processor implemented using JavaScript.

    See more about the script update processor at http://wiki.apache.org/solr/ScriptUpdateProcessor
    <updateRequestProcessorChain name="script">
    <processor class="solr.StatelessScriptUpdateProcessorFactory">
    <str name="script">update-script.js</str>
    <lst name="params">
    <str name="config_param">example config parameter</str>
    <processor class="solr.RunUpdateProcessorFactory" />

    <!-- Response Writers


    Request responses will be written using the writer specified by
    the 'wt' request parameter matching the name of a registered

    The "default" writer is the default and will be used if 'wt' is
    not specified in the request.
    <!-- The following response writers are implicitly configured unless
    <queryResponseWriter name="xml"
    class="solr.XMLResponseWriter" />
    <queryResponseWriter name="json" class="solr.JSONResponseWriter"/>
    <queryResponseWriter name="python" class="solr.PythonResponseWriter"/>
    <queryResponseWriter name="ruby" class="solr.RubyResponseWriter"/>
    <queryResponseWriter name="php" class="solr.PHPResponseWriter"/>
    <queryResponseWriter name="phps" class="solr.PHPSerializedResponseWriter"/>
    <queryResponseWriter name="csv" class="solr.CSVResponseWriter"/>
    <queryResponseWriter name="schema.xml" class="solr.SchemaXmlResponseWriter"/>

    <queryResponseWriter name="json" class="solr.JSONResponseWriter">
    <!-- For the purposes of the tutorial, JSON responses are written as
    plain text so that they are easy to read in *any* browser.
    If you expect a MIME type of "application/json" just remove this override.
    <str name="content-type">text/plain; charset=UTF-8</str>

    Custom response writers can be declared as needed...
    <queryResponseWriter name="velocity" class="solr.VelocityResponseWriter" startup="lazy">
    <str name="template.base.dir">${velocity.template.base.dir:}</str>

    <!-- XSLT response writer transforms the XML output by any xslt file found
    in Solr's conf/xslt directory. Changes to xslt files are checked for
    every xsltCacheLifetimeSeconds.
    <queryResponseWriter name="xslt" class="solr.XSLTResponseWriter">
    <int name="xsltCacheLifetimeSeconds">5</int>

    <!-- Query Parsers


    Multiple QParserPlugins can be registered by name, and then
    used in either the "defType" param for the QueryComponent (used
    by SearchHandler) or in LocalParams
    <!-- example of registering a query parser -->
    <queryParser name="myparser" class="com.mycompany.MyQParserPlugin"/>

    <!-- Function Parsers


    Multiple ValueSourceParsers can be registered by name, and then
    used as function names when using the "func" QParser.
    <!-- example of registering a custom function parser -->
    <valueSourceParser name="myfunc"
    class="com.mycompany.MyValueSourceParser" />

    <!-- Document Transformers
    Could be something like:
    <transformer name="db" class="com.mycompany.LoadFromDatabaseTransformer" >
    <int name="connection">jdbc://....</int>

    To add a constant value to all docs, use:
    <transformer name="mytrans2" class="org.apache.solr.response.transform.ValueAugmenterFactory" >
    <int name="value">5</int>

    If you want the user to still be able to change it with _value:something_ use this:
    <transformer name="mytrans3" class="org.apache.solr.response.transform.ValueAugmenterFactory" >
    <double name="defaultValue">5</double>

    If you are using the QueryElevationComponent, you may wish to mark documents that get boosted. The
    EditorialMarkerFactory will do exactly that:
    <transformer name="qecBooster" class="org.apache.solr.response.transform.EditorialMarkerFactory" />

    <!-- Legacy config for the admin interface -->









    1. Fetching 10 million records, even if you were to upgrade to an insanely fast network architecture and SSD storage, is going to take significantly longer than one second.  You very likely will be able to get the query time to be far less than one second, but the fetch time is always going to be much slower than that.

      For optimal performance on the query part, see this wiki page for guidelines:


      1. It is a crazy requirement to start with.

        If someone asks you to fetch 10 million records from any known text search engine in milliseconds -  please challenge sanity of the person who came up with such requirements.

        If someone asks you to fetch 10 million records from any known proprietary or open-source RDBMS in milliseconds -  please challenge sanity of the person who came up with such requirements.

        If you have a requirement to fetch 10m records in milliseconds from any type of storage - please challenge sanity of the person who came up with such requirements.

        It is a crazy requirement to start with.

        There is no reason that can be justified by anyone (who can calculate 2+2 without using a calculator) that it is a good idea to transfer 10 million records from another process (even a local one) into your process memory in milliseconds range. It doesn't exist.

  3. 1,087,540  records taken more then a minute to fetch from solr indexed data  and  in normal oracle select statment gives result faster then that  how we could say that solr search is more faster as it gives result in a milliseconds ?

    I want the output in milliseconds and inspite of the changes which are needed to boost the search i dnt observe  any difference in searching and it takes a time . 

    could anyone give me some concrete idea? is that really possible to search in milliseconds and if yes then what type of factors that we have to take care .

    this 1,087,540  are the testing records

    my real application data are of 70 million so if 1,087,540  takes more then a minute then of course 70 million records will take a much  time so please guide me on that .what factors i consider to boost the search speed .


    1. Which time are you concerned about?  The time it takes to do the query (which Solr reports as QTime in its response) or the total elapsed time to transfer all requested records to your client?  Are you setting the rows parameter to a million or more so that Solr actually does transfer all that data?

      If it's the query time, I gave you a link to a wiki page about performance which discusses possible problems and what to do about them.  It is possible to achieve QTime values that are very small even for millions of documents, but the transfer of those results will always take quite a bit of time.  In addition to reading the stored data off the disk, Solr must decompress it.  Stored fields have been compressed since version 4.1.

  4. Hello Everyone,

    I have a query regarding resizing a cluster. Found some useful information in "Nodes, Cores, Clusters and Leaders". But it seems the page is not helpful and has been removed from the guide. I am not finding any information regarding resizing of cluster in solr 6 documentation. Can anyone please let me know/share the link related to this information. I need to understand if it is possible to create shards dynamically.




    1. You can only dynamically add shards if the collection's router is set to "implicit" ... which means that routing is entirely manual.  If you are using compositeId so you have automatic routing, then you can split shards, but you can't add them.

      Please use the mailing list for support questions like this.