Grokbase Groups HBase user July 2010
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115 discussions - 634 posts

  • Dear all, My current HBase/Hadoop architecture has HBase region servers on the same physical boxes as the HDFS data-nodes. I'm getting an awful lot of region server crashes. The last thing that ...
    Jamie CockrillJamie Cockrill
    Jul 7, 2010 at 4:13 pm
    Jul 8, 2010 at 11:02 pm
  • First post evar! I have a 3 node cluster and have set mapred.tasktracker.map.tasks.maximum=4. I am using Cloudera's CDH2 dist (hadoop 0.20.1 and hbase 0.20.3). I am importing a 15GB sequence file ...
    Luke ForehandLuke Forehand
    Jul 15, 2010 at 11:18 pm
    Jul 19, 2010 at 4:50 pm
  • Ok, First, I'm writing this before I've had my first cup of coffee so I am apologizing in advance if the question is a brain dead question.... Going from a relational background, some of these ...
    Michael SegelMichael Segel
    Jul 16, 2010 at 10:34 am
    Jul 17, 2010 at 1:17 pm
  • I am trying to assess the performance of Scans on a 100TB db on 180 nodes running Hbase 0.20.5.. I run a sharded scan (each Map task runs a scan on a specific range: speculative execution is turned ...
    Vidhyashankar VenkataramanVidhyashankar Venkataraman
    Jul 26, 2010 at 9:44 pm
    Jul 28, 2010 at 6:51 pm
  • Dear all, I've installed HBase from the Cloudera repository, using the karmic-cdh3 distribution, which evidently gives me hbase version 0.89.20100621+17. I'm particularly interested in creating a few ...
    Jamie CockrillJamie Cockrill
    Jul 7, 2010 at 8:17 am
    Jul 27, 2010 at 6:01 am
  • About your new crash: 2010-07-15 04:09:03,248 DEBUG org.apache.hadoop.hbase.io.hfile.LruBlockCache: Cache Stats: Sizes: Total=3.3544312MB (3517376), Free=405.42056MB (425114272), Max=408.775MB ...
    Jean-Daniel CryansJean-Daniel Cryans
    Jul 15, 2010 at 5:22 pm
    Jul 16, 2010 at 9:12 pm
  • Hi all, We've been having issues for a few days with HBase region servers crashing when under load from mapreduce jobs. There are a few different errors in the region server logs - I've attached a ...
    Dmitry ChechikDmitry Chechik
    Jul 14, 2010 at 10:05 pm
    Aug 27, 2010 at 4:20 am
  • I found the following snippet in the HFile javadocs and had some questions seeking clarification. The recommendation is a minimum block size between 8KB and 1MB with larger for sequential accesses. ...
    Andrew NguyenAndrew Nguyen
    Jul 27, 2010 at 5:41 am
    Jul 28, 2010 at 3:44 pm
  • Hi all. Is there any documentation describe replication setup, because i have try two times and it doesnt work. I have added this: <property <name hbase.replication.enabled</name <value true</value ...
    Sebastian BauerSebastian Bauer
    Jul 13, 2010 at 1:50 pm
    Jul 14, 2010 at 3:30 pm
  • Hello all, I'm planning an hbase implementation and had some questions I was hoping someone could help with. 1. Can someone give me a basic overview of how memory is used in Hbase? Various places on ...
    JacquesJacques
    Jul 30, 2010 at 8:16 pm
    Aug 3, 2010 at 12:28 am
  • running a fairly complex task? i.e. if I am a 1-man show, would it be a smart choice to build on top of hbase or is a crazy idea?
    S AhmedS Ahmed
    Jul 21, 2010 at 6:59 pm
    Jul 21, 2010 at 11:40 pm
  • Hi all, I use automatic unconditional data load from other sources into my database. But data, already loaded, can be changed by users (or updated by MR jobs, f.e. some foreign keys resolutions or ...
    Andrey StepachevAndrey Stepachev
    Jul 15, 2010 at 8:42 am
    Jul 15, 2010 at 6:33 pm
  • Its my impression that most people are using nosql solutions for things like statistic logging etc. Has anyone build a web application purely in hbase? e.g. Say an application like Blogger or Gmail ...
    S AhmedS Ahmed
    Jul 10, 2010 at 5:44 pm
    Jul 12, 2010 at 4:48 pm
  • Dear hbase-users, I was wondering if you might be able to help. I am trying to setup HBase (and as such, Zookeeper) on Ubuntu 10.04 using the Cloudera Karmic CDH3 distribution. Zookeeper has ...
    Jamie CockrillJamie Cockrill
    Jul 6, 2010 at 11:21 am
    Oct 20, 2010 at 6:52 pm
  • Hello! I was hoping some has experiences with both Cassandra and HBase. What are the major differences between Cassandra and HBase? Does HBase have the concept of ColumnFamilies and ...
    S AhmedS Ahmed
    Jul 8, 2010 at 5:27 am
    Aug 18, 2010 at 7:23 pm
  • Can someone explain, at a high level, how the hbase service is exposed? Is it a Java socket or? (sorry not that well versed in this) Does anyone have any numbers on the performance differences ...
    S AhmedS Ahmed
    Jul 22, 2010 at 6:23 pm
    Jul 23, 2010 at 6:37 pm
  • Hi all I have been noticing a slightly flaky behavior with respect to HBaseAdmin.tableExists(). After I have created the table, it returns true/false every time when called. In hbase shell, the list ...
    Karthik KambatlaKarthik Kambatla
    Jul 20, 2010 at 9:53 pm
    Jul 21, 2010 at 7:45 pm
  • Hi, I am a complete HBase and HDFS newbie, so I apologize in advance for the inevitable bloopers. We are doing feasibility testing on NoSql data store options, with rather high ingest rate ...
    Thomas DowningThomas Downing
    Jul 16, 2010 at 2:34 pm
    Jul 20, 2010 at 5:28 pm
  • Hi All, I have set up the Hbase in standalone mode. Both my server an client are running on the same box. When I tried to load a large amount of data, the client is hanging after loading around ...
    ManuaManua
    Jul 7, 2010 at 3:50 pm
    Jul 8, 2010 at 4:46 pm
  • http://hbase.apache.org/docs/r0.20.5/api/overview-summary.html#overview_description Here is states that it is recommended to use HDFS-630 patch for Hadoop. So, why does the hbase 0.20.5 contains a ...
    FerdyFerdy
    Jul 1, 2010 at 12:44 pm
    Jul 5, 2010 at 6:22 pm
  • Using Hbase 0.20.5 with Hadoop CDH2 0.20.1+169.89 I noticed something very strange. When overwriting a certain column in a column family with 1 VERSIONS, and removing that value later (for example ...
    Ferdy GalemaFerdy Galema
    Jul 29, 2010 at 3:55 pm
    Jul 30, 2010 at 2:20 am
  • Below is snippet from region server log. The first memstore flush of ~71.6m was considerably quicker than the second memstore flush of ~131.0m I guess that contributed to the LeaseExpiredException ...
    Ted YuTed Yu
    Jul 22, 2010 at 4:36 pm
    Jul 23, 2010 at 4:06 am
  • Hi, We recently upgraded our QA cluster to Cloudera Version 3 (CDH3) which has Hbase 0.89. Our cluster is running on JDK 1.6.0_18 version. On trying to start up Hbase it basically gives an error ...
    Syed WastiSyed Wasti
    Jul 20, 2010 at 11:23 pm
    Jul 21, 2010 at 4:28 am
  • Hello, I have a M/R task running over hbase tables. I added a one line of output in my reduce tasks running over a set of tens of millions of records. This was a little silly, but I was kind of ...
    Stuart SmithStuart Smith
    Jul 14, 2010 at 12:59 am
    Jul 15, 2010 at 1:10 am
  • I'm trying to have our deployment layout..I read one of the articles/FAQ (probably JG's)...that it's better to have zookeeper on separate cluster/separate sets of machine..I'm assuming that is the ...
    Vramanathan00Vramanathan00
    Jul 8, 2010 at 11:20 pm
    Jul 9, 2010 at 4:20 pm
  • Hi all, We have 53 machines in our hbase cluster and run 6 clients to scan a table. During scanning, we found when a region is scanning , it'll new StoreFile object, create a connection to datanode ...
    Baggio liuBaggio liu
    Jul 29, 2010 at 2:10 am
    Jul 30, 2010 at 8:05 am
  • Hi all, I am trying to use stargate to get multiple versions of the cell, and my query looks like this: ...
    Eric YangEric Yang
    Jul 3, 2010 at 8:57 pm
    Jul 4, 2010 at 5:31 am
  • Hi, I am looking for API that would tell me when a table was created. I looked at HTable class but didn't find it. Thanks
    Ted YuTed Yu
    Jul 28, 2010 at 11:31 pm
    Aug 17, 2010 at 11:11 pm
  • I kept running into the stop-the-world GC during batch import of data into hbase. The configuration of a node in the 8-node cluster is as follows. * 4-core * 64-bit JVM * 8 GB of memory * CDH2 for ...
    Steve KuoSteve Kuo
    Jul 29, 2010 at 8:17 pm
    Aug 7, 2010 at 6:31 pm
  • Hi everyone. We are modeling our data based on one table per customer, so it's easy to drop one or add one without having to put offline while altering the table. I have to questions regarding this ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    Jul 30, 2010 at 2:45 pm
    Aug 2, 2010 at 5:50 pm
  • Hi I am experiencing a few problems with TableMapReduceUtil, where in only some of the puts from the reduce are written to the output table. If I explicitly write to the table from within reduce ...
    Karthik KambatlaKarthik Kambatla
    Jul 27, 2010 at 6:17 am
    Jul 27, 2010 at 11:15 pm
  • I started a hbase cluster of 8 nodes and two regionservers died before I even started any Map job writing data into it. There are several interesting exceptions and I really appreciate any help on ...
    Steve KuoSteve Kuo
    Jul 21, 2010 at 9:47 pm
    Jul 23, 2010 at 8:22 pm
  • Is there a way to configure hbase.client call timeouts? If we have a network outage or if hbase/zk goes down for some reason, we want our table.puts to timeout reasonably (5-15 seconds) so we can ...
    Justin CohenJustin Cohen
    Jul 13, 2010 at 5:39 pm
    Jul 14, 2010 at 4:32 pm
  • Dear All, once, I read an article about Hbase, the article said that HBase good for the process of reading but not for writing. So, if we have everyday applications should still use the RDBMS and the ...
    Fitrah firdausFitrah firdaus
    Jul 7, 2010 at 2:27 pm
    Jul 9, 2010 at 2:33 pm
  • Hi all, We experienced a downtime in our HBase installation today. We have our HBase hosted in EC2 with 1 master (with ZK) and 3 slaves (all of them are m1.large). We are using HBase version 0.20.4 ...
    Vaibhav PuranikVaibhav Puranik
    Jul 15, 2010 at 3:58 am
    Nov 7, 2010 at 6:43 pm
  • HI.. Am experimenting with HBase for a search application. Have done bulk import of input data into hbase table using mapreduce.. Input format: <key <value I used SampleUploader.java for populating ...
    Ilay rajaIlay raja
    Jul 11, 2010 at 4:32 am
    Jul 31, 2010 at 3:26 am
  • My HBase cluster was in a bad state with all regionservers terminated. After waiting for bin/stop-hbase.sh to shutdown for a long time, I hard killed HMaster. When I restarted hbase, I found table_c ...
    Steve KuoSteve Kuo
    Jul 27, 2010 at 10:49 pm
    Jul 28, 2010 at 12:16 am
  • Hi, I am looking for HBase API for getting the following information: 1. is Meta table available - I found RegionServerOperation.metaTableAvailable() but it is protected 2. I found ...
    Ted YuTed Yu
    Jul 23, 2010 at 9:41 pm
    Jul 26, 2010 at 11:37 pm
  • anyone able to share their experience, thoughts on the 'smallest' production HBase cluster in operation? Thinking there may be some point in the # Nodes scale where one transitions from/to "that's ...
    Paul SmithPaul Smith
    Jul 22, 2010 at 10:56 pm
    Jul 25, 2010 at 3:00 am
  • Hi everyone! I'm new to HBase and I had one question about what's the best write strategy. I have a process that updates a series of rows several times, and as HBase is modelled after BigTable, I ...
    Héctor Izquierdo SelivaHéctor Izquierdo Seliva
    Jul 20, 2010 at 4:32 pm
    Jul 22, 2010 at 8:10 am
  • I am trying to evaluate hbase to be used as an analytical data store, and I have a few questions I have not been able to answer from the wiki or googling in general. 1) How can hbase be configured ...
    WayneWayne
    Jul 14, 2010 at 8:27 am
    Jul 16, 2010 at 5:30 am
  • If I build a forum application like vbulletin on top on hbase, I can forsee that each page view will have multiple calls to hbase. Let's picture someone viewing a particular thread (question) on the ...
    S AhmedS Ahmed
    Jul 14, 2010 at 3:13 pm
    Jul 14, 2010 at 4:23 pm
  • Hi there: On an internal testing cluster with 3 nodes, when I run "flush '.META' " on the hbase shell, it gets the following "Can not obtain block" error. I checked around, and many posts say that it ...
    Yabo XuYabo Xu
    Jul 12, 2010 at 9:36 am
    Jul 13, 2010 at 5:04 pm
  • I shutdown hbase. Added some new nodes to hdfs, rebalanced. Also added those nodes to hbase regionservers. Then started hbase. I am having this strange problem where the new nodes let's say host1 ...
    Arun RamakrishnanArun Ramakrishnan
    Jul 10, 2010 at 1:42 am
    Jul 13, 2010 at 3:49 am
  • hi! seems stargate saves state of previous requests. For example if I try to put row and supply wrong column name. NoSuchColumnFamilyException exception will be thrown for all other requests (even ...
    Sasha.maksimenkoSasha.maksimenko
    Jul 30, 2010 at 1:28 pm
    Aug 3, 2010 at 8:44 am
  • Hello all, I am running a job from jython that is importing time series data into HBase. I started to see the following messages and wanted to dive deeper to find out if they are true errors or just ...
    Andrew NguyenAndrew Nguyen
    Jul 23, 2010 at 4:59 pm
    Jul 23, 2010 at 9:25 pm
  • Hi, We are using HBase 0.20.5 We recently experienced loss of region server hosting .META. table If someone can point me to the code which handles this scenario, that would be great.
    Ted YuTed Yu
    Jul 23, 2010 at 5:38 pm
    Jul 23, 2010 at 7:58 pm
  • Thanks for the answer. GC pause seems to be a major cause for region server to come down: 2010-07-21 09:07:14,138 WARN org.apache.hadoop.hbase.util.Sleeper: We slept 291505ms, ten times longer than ...
    Ted YuTed Yu
    Jul 21, 2010 at 5:25 pm
    Jul 21, 2010 at 5:51 pm
  • Hi, I have a write API call that does 3 puts (2 puts to one table and a 3rd put to a second table). How do I go about making sure that these all happen or none happen at all? In short, an atomic ...
    N KapshooN Kapshoo
    Jul 15, 2010 at 8:13 pm
    Jul 18, 2010 at 8:22 pm
  • In what context/feature is facebook using hbase?
    S AhmedS Ahmed
    Jul 14, 2010 at 6:05 pm
    Jul 14, 2010 at 6:34 pm
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102 users for July 2010

Jean-Daniel Cryans: 105 posts Stack: 38 posts Ted Yu: 38 posts Ryan Rawson: 32 posts Jamie Cockrill: 21 posts S Ahmed: 21 posts Jinsong Hu: 18 posts Jonathan Gray: 18 posts Luke Forehand: 17 posts Stuart Smith: 13 posts Todd Lipcon: 13 posts Michael Segel: 12 posts Andrew Nguyen: 11 posts Steve Kuo: 11 posts Angus He: 10 posts Vidhyashankar Venkataraman: 10 posts Vramanathan00: 9 posts Hegner, Travis: 9 posts Edward Capriolo: 8 posts Eric Yang: 8 posts
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