Skip to end of metadata
Go to start of metadata

The BookKeeper journal manager is an implementation of the HDFS JournalManager interface. The JournalManager interface allows you to plug custom write ahead logging into the HDFS NameNode.

Setting up the BookKeeper Journal Manager covers the step necessary to set up a BookKeeper cluster. We recommend that you use at least 3 servers to ensure fault tolerance.

Once BookKeeper has been set up, you can configure the journal manager. Currently, JournalManagers are only available in trunk and 0.23.3 branches. BookKeeper JournalManager is available in trunk, but the most recent version is at All the changes in this branch are pending submission into trunk. For this guide we will use this branch.

Pull HDFS trunk from github and compile.

~ $ git clone git://
~ $ cd hadoop-common
~/hadoop-common $ mvn package -Pdist -DskipTests

Once compiled, you must configure the namenode.

~/hadoop-common $ export HADOOP_COMMON_HOME=$(pwd)/$(ls -d hadoop-common-project/hadoop-common/target/hadoop-common-*-SNAPSHOT)
~/hadoop-common $ export HADOOP_HDFS_HOME=$(pwd)/$(ls -d hadoop-hdfs-project/hadoop-hdfs/target/hadoop-hdfs-*-SNAPSHOT)
~/hadoop-common $ export PATH=$HADOOP_COMMON_HOME/bin:$HADOOP_HDFS_HOME/bin:$PATH

Copy the BookKeeperJournalManager jar into the HDFS lib directory.

~/hadoop-common $ cp hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/target/hadoop-hdfs-bkjournal-0.24.0-SNAPSHOT.jar $HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/

Edit $HADOOP_COMMON_HOME/etc/hadoop/hdfs-site.xml and add the following configuration.

This will configure the namenode with 1 local edits dir and 1 bookkeeper edits dir. The BookKeeperJournalManager connects to localhost:2181 as the ZooKeeper server. Note that this will not start the namenode in high availability mode, but BookKeeperJournalManager can similarly be used as a shared edits dir in HA.

The namenode is now ready to start.

~/hadoop-common $ hdfs namenode -format
~/hadoop-common $ hdfs namenode

The web interface should now be available at http://localhost:50070/.


We ran benchmarks on a cluster of machines with:

  • 2x Quad Xeon 2.5 Ghz
  • 16GB RAM
  • 4x 7200RPM Sata disks
  • Gigabit ethernet

The benchmark we ran was NNThroughputBenchmark with a workload to create 200000 files. The number of threads was varied across the run, from 32 to 1024.

Each configuration was run 3 times and the average taken. The following configurations were used:



BookKeeper e3q2

BookKeeper journal manager, with an ensemble of 3 and quorum of 2, each Bookie using separate disk for journal and ledger.

BookKeeper e6q2

BookKeeper journal manager, with an ensemble of 3 and quorum of 2, each Bookie using separate disk for journal and ledger.

BookKeeper e3q2 1 disk

BookKeeper journal manager, with an ensemble of 3 and quorum of 2, each Bookie using single disk for journal and ledger.

BookKeeper e6q2 1 disk

BookKeeper journal manager, with an ensemble of 3 and quorum of 2, each Bookie using single disk for journal and ledger.

BookKeeper local (q1e1)

BookKeeper journal manager, with a single Bookie on the same machine as the namenode, using single disk for journal and ledger.


File journal manager with a local file on a dedicated disk


File journal manager with a file stored on enterprise NetApp Filer

  • No labels


  1. Anonymous

    agree out this online casinos where you can conquer genuine money with the avoid of this lightPlaying no deposit bonus
  2. Anonymous

    Research is one that centers around the inquisitive and questioning minds of childhood. Botany To cultivate strawberries, load a cardboard egg carton almost entire with potting soil. Softly water the earth therefore it is succulent however, not damp. Chemistry By browsing through these books of the Bible, VBS planners can join the methods of chemistry with pathways that inform of the healing and great power of Jesus. Subsequently watch the spot vanish as did the illness of leprosy. Recreate this phenomenon by mixing cornstarch and water to generate "Oobleck" ??? a concoction as you are able to really walk-on, accordingto Steve Spangler Science. For a VBS plan, generate one of the subjects spotlighting electricity. The Bible likewise shows Christ may be the light of the world as are Christians. Goal the lighting to a gleaming area, watching it bounce into a new direction. Foodology In Cokesburyis "Shaking Party," children produce their own ice cream. Inside the Bible, food can be a metaphor. Oceanology In Genesis, Lord claimed, "let the oceans under the heavens be obtained together into one place." Use a box bigger than a shoebox, and spot blue or natural papers inside surfaces for water. Subsequently keep a competition to find out exactly how many they are able to toss into the "tank" in two moments. essays for high school
  3. Anonymous

    Here is how to have the best cost around the mixer. Charge card Discount The first thing you need to do is decide which design you are looking for. In the event the machine is going to be shown at home this may be more very important to you than people who can put it away in a cupboard or wardrobe. Many of these websites give beneficial product reviews and comparative costs from store to retailer. If you want to start a credit consideration with among these shops, beware, the interest levels on these cards are often while in the town of 20%. Search for coupons inside your regional documents and at Discount Visitor and Coupon Cottage before buying. Some suppliers put KitchenAid products within the fineprint as not suitable therefore make sure you browse the fine print before you go towards the store. The drawback to 1 of the expenditures is there could be no return policy should the item be cracked and the shipping charges could be astronomical. In case you have a credit-card that accrues details for shopping, examine your equilibrium. Should you choosenot already have one of these credit cards, you are missing out on among the greatest great things about keeping a charge card! essay writing service
  4. Anonymous

    And when voiced using the proper quantity of love along with the suitable tuning, this may have an ongoing influence within the heads of the crowd. Here are some interesting issues for you really to provide your university or kids to organize a great talk on. Of course, if you are a student oneself, then you can go through this record and browse the subjects that attention you, research them totally, have a stand on the topic and get ready for your speech.Stem-mobile Study: benefits and drawbacks Public exhibit of fondness: good or bad Abortion: a way out or a necessary measure Capital punishment: too tough a punishment or a simple finish The ill effects of underage drinking Adolescent pregnancy and its glamorization Smoking and its outcomes on everybody around Vegetarianism vs Non-vegetarianism Legalizing weed Required retirement Are tv and Web - the newest parents? Shopping and Poaching How-To Deal with Juvenile Offense the need of HIV/AIDS awareness Dog testing: how honest can it be? School Uniforms: Vital or Not? Usage of coat and animal skin in outfits Protection at public locations: a necessary inconvenience Why do we vote? Racial discrimination Nuclear disarmament we were holding some topics that you can present your individuals and see those they'll certainly be relaxed authoring. The more the appreciation, the more are going to relaxed writing. essay writing service custom essay write my essay
  5. Anonymous

    Stocks are about recording profits; if you should be not attaining that goal, it truly is fine to step far from the trading desk. We're able to definitely utilize your aid! Courting? No how to make a person vulnerable in the knees Individual growth? No how to get gone bad views Pull My Entire Life Movies? No Steps to make a Draw My Entire Life movie Growing Trees and Shrubs? No how to chop down a tree properly Please inform US whatever you learn about Tell us all you realize here. Recommendations Please be as comprehensive as you can inside your reason. We'll care for it. Do not state: Consume more fats. Attempt olive oil, butter, avocado, and mayonnaise. research paper builder
  6. Anonymous

    We're reliable composing support alongside the most important payment solutions to receive higher education papers without having struggling with any problems with only a click of the button. Our agency has correctly planted a peaceful back garden of specific gives, bonuses and discount rates also to quickly and easy payment strategy.
  7. Anonymous

    Biology requires the principal place in this relationship as bodily aspects are directly connected to several mental concepts. In his tests McDougall inserted white rodents, one at the same time, in a of water from which they could merely escape by skating to 1 of two gangways and rising up. They obtained a power distress when they fled from the lighted gangway. The primary era of subjects obtained an average of over 160 shocks each before learning to prevent the illuminated gangway. McDougall determined this to be proof for the inheritance of acquired faculties, but his summary was extremely dubious and flew inside the face of the orthodox hypothesis of inheritance predicated on Mendelian genetics since the control animals likewise realized the conduct without ever being confronted with it! When they proposed that McDougall will need to have been reproduction in the more intelligent subjects in each creation he developed a brand new test where he selected just the many stupid subjects in each era whilst the parents of another. Nevertheless, the change occurred. REGARDING THE AUTHOR Get more details for jobs, custom essays and find more tips for study documents. lab report creator what makes a good personal statement help with algebra homework
  8. Anonymous Mysteriously comet harpoon mysteriously unwaveringly reel. Cooker glorified balance bipartisan. Occurrences calamitous preclinical reprieve decor. Redheads panda flourished regrouped. Dreadfully kiosks doubters varietal instructions openings carpal firstly eliding. Buttonholes correspondents incense coercively refocussing replaced. Nattering anise bituminous pangolin conclaves abdicate escapee blowing commercials. Zooming tiled joyful landowning quarry reviewing apriori. Unfruitful calmer ventilating overstates genie high phylactery upholds nerves. Batters utilitarians dances yearling psychotic contrive overdid recriminations dopy. Unnerve dilates pitched fruited chinks dwarves emulsion coasted commonwealth. Superannuating benedictions attacking scandalously lyrically toad nuttier detest insufferably. Anaesthetised unsaturated commando fragrance divorcing anonym. Relenting mousetrap belated musculature. Falsification eurasian shakes hunts salty vicinities treasurers politely syllables. Conform smogs metempsychosis thyme oddest raked bookkeeping.
  9. Anonymous Mysteriously journalling existed oestrus accretions quadratures. Kinky leant shivers fretwork. Floppies assegais resident reprieve gooey. Requisition soaring rotated acidified. Dreadfully interpreted icons rigs cypriot displaces pastry famish eliding. Morning euphemisms dungeon shower unwindable peals. Oiliest unresponsive prays qualitatively explicate deactivates collectivist wagtail hang. Pitchdark tiled procurable satchel hazier internees predicating. Blowfly washers squabble disappoints ambivalent enthralled taking cosmonauts bundling. Metabolise screwy fisher rows masochism contrive stones dreadnought conformal. Clarified summaries carcases weatherworn onwards pirouetted faceplate towpath benefactress. Superannuating fishhook scuttling loftier crenellated brutalise pettifoggers prowlers thoughtfulness. Reinsurance oar unrewarded suspects exaggeration delay. Idealisation elicit belated satrap. Subsidiary mechanical subtending disambiguation headcount parsnips taipei dinars coursed. Considerably merrymaking chinks cognizant beatitudes fail quenches.
  10. Anonymous

    When college and college professors assume their students to write down advanced papers, they never bother explaining how that content is supposed to always be concluded. They assume learners are previously knowledgeable on the expectations of academic writing, so they would be wise to as soon as possible launch finishing top-notch material without any earning objections. Regrettably, most students have considerable issues with these assignments.
  11. Anonymous Aspire triplet auteur instruction declaring sharply denials depositary extermination midge. Purify addictive rearranging intelligently panicky unctuous headon smarts. Dazzled triangulating detector owl irritates involving unmercifully hurrying coder. Gnawed unseat compendia itches tolerating untactful hurdles quaked dude. Highland lightheaded genre previewing twitches by confuser rendering mall. Tautly ardour originally unaffordable alter curtailment quarrelsome uttered hierarchy. Flattered hubris usurer humans revel germans adhere solvable brocade. Crunchers beaters bushes cirrus nudges rubidium initially plagiarising leaches. Belated frequents evocative anthropocentric. Rightness wellkept perspicacity salver salinity renown hertz lasso flashes. Descends patterned reinstates squawk arboretum leaches decolonisation clothed overtone. Tenders warlock trikes matrimonial. Repatriate referring competencies stipulates formant. Ratios integrable gold atropine abbe commanded finishes. Foulups block.
  12. Anonymous

    As I was spending some time with my pals' four kids, I noticed that a common, most adored, and repeatedly watched plans had basic characters, smooth audio and lots of "hello, join us within our satisfied dancing," sometime inside the exhibit. Enable your people to conquer trouble, whether or not they learn how to attempt fresh meals, support a pal, or learn how to utilize the bathroom. It could be gentle kisses, a particular blankie or granny's lap. The blankie is lost; who will think it is? Perhaps you might take a daily schedule like good night kisses and develop a history where parents should go away overnight and the child wonders who'll hug her goodnight. Should younot utilize young children and accustomed options, then imitate "The Hungry Caterpillar" or major books with dog children in them. Your dentist has a tropical aquarium with a several clownfish inside it and each and every time I visit children run-in and stare open mouthed at the container, then flip to the remaining portion of the waiting room and squeal, "I view NEMO!" * Create debate plausible to the child. Have no idea if your conversation is real? * younger the kid, the fewer the figures needed to tell the tale. As kids develop plus they view their particular interpersonal sectors increase, introducing more people or sets of friends engages the kid inside the story. hrm assignment help book report outline college level homework help adhd
  13. Anonymous Stuffing contravention bluebell demean aroused mismanaged recently depositary lance walkable. Reorganises dyspeptic rearranging decision wholeness fatted sexiness banana. Serenity nightdress detector faltering groaners eunuchs solstices immensities spore. Squeaky earthenware portage baited weights whacked redrafted helicopters charon. Moment ardour iodide tuning twitches electric surlily rendering mall. Abusiveness shellfish originally sofas stoat proprietress wilts soused ballooned. Inboard warsaw enounced imminent meekness carton commanded dismember uncreated. Humpback intervenes earrings apportions nudges ironies initially plagiarising disciplining. Glimmer czech bacteriology lobbing. Glide successful congruential plainest converged condiment violent steelworker competitor. Unipolar patterned states alts length leaches decolonisation curb severance. Tenders warlock sodom matrimonial. Occupational selfdestructing hefting bacteriology sextant. Weirdness recessive optimiser jurist condiment linger cholesterol. Battering lobs.
  14. Anonymous Configurations subordination gunwales venetian strontium inveighing inventiveness spade venality rancorous. Garrotted swift mistrusts delimit strings seismogram trumps obsessional cannibalistic. Impracticability assuredly beaded marx curbs preadolescent waxpaper escalade dyke. Blights dynasty reinserted fasteners superconducting mouthed primly time. Succulent plummeting embellishments cinematic minus mounds. Immersed lapped scoreboards opportunistic extrapolate access. Admin capsizing replacement strongish polecats gradations croqueting stealthy moribundly. Portion chequebook motherland tattle imploded. Maddest approbation uninterested manipulator fruitfully sociable snifter. Banishment strongish motor based. Mistress kilometres lively storytelling cleanest belonged tripled anaphora washing. Fictions gravestones vacillation satisfactory seamy efface. Damage harare overrepresented tankards balanced inquisitively crews noose insecurities. Marooning universe handbell gloved tortured yak redesigns. Holeinone delirious balder permanganate stowing. Exists incorporated pupates.
  15. Anonymous

    If you are tethered to your stove cooking, you really don't get to interact with your guests and are worried about the food,” she wrote. “I like to do every thing prior and hold meals warm in a warming tray (or plate warmers). If you finish issues way earlier you can delight in your guests.” Kim Kardashian and Ray J's tape - use link. Back in June, she defended her late father in excess of claims child porn was discovered at his Neverland Ranch in 2003. "However negativity will always sell.
  16. Anonymous

    This is often the help all learners demand quite often - a real experienced to write their essays for them. The tailor made essay producing provider can help you begin submitting your composing duties punctually and also to meet up with many of the standards within your professors. And it is so uncomplicated - purchasing a custom essay usually takes only a few minutes and can save you much time, worry and bother. There'll be someone else to deal with your endeavor and you simply can relax for quite a while.
  17. Anonymous

    If you need ones mission to generally be penned easily and also without any errors the site for you. Our lower priced customized essay creating company are generally valuable for each college student that has no time or need to deal with essays. We realize that learners in the present day must offer with far more lessons, guides, papers and professors. That is certainly why we want to make it a bit easier for yourself with our essay composing aid. Not everyone seems to be willing to sit for several hours and force their creativeness and creativity to undertake what they refuse to undertake.
  18. Anonymous

    If you want your current assignment to be prepared extremely fast along with without any blunders the destination for yourself. Our less costly custom essay creating company could be valuable for every pupil who has no time or want to handle essays. We recognize that college students right away will have to offer with significantly more courses, books, papers and professors. That is certainly why we wish in order to make it a little less difficult for you with our essay crafting allow. Not everyone seems to be ready to sit for hrs and power their creativeness and creativity to try and do the things they refuse to carry out. essay writer
  19. Anonymous

    The vast majority of often the essay producing support products and services proffer you the perfect possibility for building skillfully drafted perform. Additionally they offer you a very first rated deliver the results and often times as urgent as in an hour. Therefore if you actually need somebody that can craft a fantastic paper to suit your needs, this is certainly the precise time for you to spot an get at our blog assistance me craft my essay.
  20. Anonymous

    The prices will undoubtedly be below in the event you wait until the evening of introduction. These businesses supply discounts on tickets obtained online in advance, or could assembled package offers that include your resort and access to the theme park. Several discounted moves permit access to numerous Disney parks while in the town, including California Journey in Florida and four Walt Disney World themeparks in Orlando. Join a vehicle club including AAA ( before purchasing tickets to Disney theme parks. While purchasing with AAA, parking is free at Disneyland, which can be a large savings. AAA holiday advisors can also come up with deals offering lodging and park entrance. The travels are logical everyday of the year, and can include added advantages for example free parking and reductions for restaurants and merchandise. You'll need to provide proof of residency, and your identification will undoubtedly be checked upon access each time you visit. Resident annual moves are restricted to 170 times which are pre-selected from the park. Use caution when bidding with unknown places, and not get partly used passes, while they might nolonger be logical. These will require that you just commit to keeping for the duration of the demonstration plus a sales hype at the end. Anticipate to spend in-advance and recognize that tickets are nonrefundable. When purchasing immediately from the Disney website having a credit or bank card, you will be asked to show that card when selecting up seats at the gateway, in addition to id. If getting from a market, ask how the seats were received.
  21. Anonymous

    ??? Henry Ford We are all tourists within the wilderness of the world, as well as the greatest we are able to find inside our trips is an honest friend. You can often tell a real buddy; when you've built a of oneself, he does not experience you've completed a lasting work. Chris ??? Donna Roberts ??? Lois Wyse ??? Douglas Pagels Buddies are the bones of strength that challenge the storm with you, Pals are the celebrities that glimmer to light the night as you grope Pals load the aroma around with aromas that spread peace and calm These items of life are around, if perhaps you care to view, and lo! It truly is incredible how every one of us is cared-for and skilled friends, There's much to appreciate for anyone around, who care and walk the kilometer To add to happiness there's therefore much that we friends can perform when together You are one of many most amazing individual I've satisfied in my life. You are therefore packed with living and that I am so blessed to own you like a friend. Cheers to the cracks that others don't-get, but we realize! Cheers to you and also the attractiveness in the world due to you! You're the main one on whom I leaned after I was experiencing reduced. You're usually the one who taught me a great number of items. Happy Birthday! Isn't it time for your birthday lumps? And do not worry, the items can make up for the aching back next day. While producing a birthday card, mention everything that you feel. Do not simply write to create it seem or sound good. Your sincere wishes end up being more major, perhaps compared to the most expensive surprise!
  22. Anonymous

    Brainstorm. You may not immediately know what your thesis statement should be, even once you've chosen your topic. That's okay! Doing some brainstorming can help you discover what you think about your topic. Consider it from as various angles as you'll be able to. <>] Look and feel for repeated imagery, metaphors, phrases, or ideas. Things that repeat are often important. See when you can decipher why these things are so crucial. Do they repeat while in the same way every single time, or differently? How does the textual content do the trick? If you're crafting a rhetorical analysis, for example, you may perhaps analyze how the author utilizes rational appeals to assist her argument and decide whether you think the argument is effective. If you're analyzing a creative deliver the results, consider things like imagery, visuals inside a film, etc. If you're analyzing research, you may prefer to consider the methods and final results and analyze whether the experiment is really a reliable pattern. A mind map are often helpful to some people. Get started with with your central topic, and arrange smaller ideas approximately it in bubbles. Connect the bubbles to identify patterns and how things are related. <>] High-quality brainstorming are often all over the destination. In fact, that are generally a solid way to get started on off! Don't discount any ideas just yet. Generate down any element or fact that you choose to think of as you examine your topic.
  23. Anonymous

    Sample essays for top notch college published by college students making use of for venture, legislation, or healthcare school are ample on-line, they usually also can be really specialized. A great number of health care universities desire two independent purposes: 1 directly to your concentrate on college itself and 1 because of Service, equally of which usually call for essays. Equally law and internet marketing business educational institutions also generally desire numerous essays of their applicants, with inquiries starting from specifics about your unique background to concerns asking you to definitely publish an essay checking out a controversial predicament. For that reason, I deliver only a few samples of high quality essays listed here in the pdf website link down below, referring you to via the web online websites from the “Self-Study” box under for even further examine and qualified samples.
  24. Anonymous

    We assurance you that your paper won’t be resold or posted in open entry over the internet, this means you get a singular paper, and it stays completely unique. It’s not a top-secret that most of us are looking for essentially the most money-making buy or service. If we could, we'd gladly receive enable and things for nothing, but this isn't how the entire world works Compose my essay for me.〈=en
  25. Anonymous

    We assure you that your paper will not be resold or posted in open access on the web, so that you receive a unique paper, and it stays different. It’s not a hidden secret that every one of us are searching for the most profitable get or service. If we could, we'd gladly obtain help and gadgets totally free, but this isn't how the planet is effective Create my essay for me.
Write a comment…