Apache Kylin

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Apache Kylin : Analytical Data Warehouse for Big Data

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  1. Make sure the hadoop version ( HDP or CDH ) of build cluster and query cluster is supported by Kylin.
  2. The hadoop version of build cluster and query cluster must be the same.
  3. Check commands like hdfs and hive are all working properly and can access cluster resources.
  4. If the two clusters have enabled the HDFS NameNode HA, please check and make sure their HDFS nameservice Nameservice names are different. If they are the same, please change one of them to avoid conflict.
  5. Please make sure the network latency between the two clusters is low enough, as there will be a large number of data moved back and forth during model build process.

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  1. Install Kylin 4.0 by the following guide on Kylin server.
  2. Create a directory called 'build_hadoop_conf' in the $KYLIN_HOME and then copy the hadoop configuration files of the build cluster to into this directory ( Note: make sure copy the real configuration files, not the symbolic links ).
  3. Set  the value of the configuration 'kylin.engine.submit-hadoop-conf-dir' in the '$KYLIN_HOME/conf/kylin.properties' to the directory created in the step 2.
  4. Copy the hive-site.xml of the build cluster into the directory of the hive configuration on query cluster, for example: /etc/hive/conf.
  5. The value of the configuration 'kylin.engine.spark-conf.spark.yarn.queue' in the '$KYLIN_HOME/conf/kylin.properties' should be configured as the queue of the Yarn on build cluster.

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