Grokbase Groups HBase user March 2013

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110 discussions - 677 posts

  • Hi, I have a table in hbase which has more than 5GB of data, it is distributed at 101 regions at 5 regionservers. When I execute an endpoint which is supposed to fetch a column qualifier value using ...
    Kumar, Deepak8Kumar, Deepak8
    Mar 12, 2013 at 5:52 am
    Apr 2, 2013 at 6:52 am
  • Hi all, I have set up Hbase in pseudo distributed mode. I am using hadoop-1.1.2 hbase-0.94.6 and setup files are in Home directory. content of ~/hbase-0.94.6/conf/hbase-site.xml is <configuration ...
    Alok Singh MahorAlok Singh Mahor
    Mar 30, 2013 at 2:03 pm
    Apr 5, 2013 at 11:48 am
  • Hi Nick, As an HBase user I would welcome this addition. In addition to the proposed list of datatypes A UUID/GUID type would also be nice to have. Regards, /David
    David KochDavid Koch
    Mar 14, 2013 at 4:52 pm
    Mar 19, 2013 at 8:39 pm
  • We are using a 6-node HBase cluster with a Thrift Server on each of the RegionServer nodes, and trying to evaluate maximum write throughput for our use case (which involves many processes sending ...
    Dan CrostaDan Crosta
    Mar 1, 2013 at 12:17 pm
    Mar 5, 2013 at 7:05 am
  • I have key in the form of "hashedid + timestamp" but when I run scan I get rows for almost every value. For instance if I run scan for 'azzzaaa' that doesn't even exist even then I get the results ...
    Mohit AnchliaMohit Anchlia
    Mar 28, 2013 at 4:16 am
    Mar 30, 2013 at 4:38 pm
  • Hey guys, as I sent in an email a long time ago, the RSs in my cluster did not get along and crashed 3 times a day. I tried a lot of options we discussed in the emails, but it not solved the ...
    Pablo MusaPablo Musa
    Mar 8, 2013 at 3:45 pm
    Apr 3, 2013 at 9:41 pm
  • It was suggested to me that there might be a way to delete a cell in a column for a particular timestamp, without masking all older values. Is this true? Or have I been fed lies? Thanks! Natty -- ...
    Jonathan NatkinsJonathan Natkins
    Mar 7, 2013 at 5:55 pm
    Mar 8, 2013 at 3:20 am
  • Hi, The issue that I am facing is around the performance drop of Hbase, when I was having 20 columns in a column family Vs now when I am having 40 columns in a column family. The number of columns ...
    Pankaj MisraPankaj Misra
    Mar 25, 2013 at 4:56 pm
    Mar 27, 2013 at 10:33 pm
  • Hi all, I've been lurking here for a while, so thanks for all the valuable tips and guidance you've given so far. I'm running some experiments to understand where to use coprocessors. One interesting ...
    Kim HamiltonKim Hamilton
    Mar 5, 2013 at 1:14 am
    Mar 8, 2013 at 2:12 am
  • Hi All Pls welcome Anoop, our newest committer. Anoop's work in HBase has been great and he has helped lot of users in the mailing list. He has contributed features related to Endpoints and CPs ...
    Ramkrishna vasudevanRamkrishna vasudevan
    Mar 10, 2013 at 4:42 pm
    Mar 20, 2013 at 3:17 pm
  • Dear All, I had some miserable experience with gets (batch gets) in hbase. I have two tables with different rowkeys, columns are distributed across the two tables. Currently what I am doing is scan ...
    Mar 6, 2013 at 4:36 am
    Mar 6, 2013 at 7:06 am
  • Hi, We recently encountered the issue that HBase tables got into a state that was not disabled nor enabled. We found that the root cause was the linux clock skewed more than 5 hours. I googled and ...
    Mar 15, 2013 at 10:49 pm
    Mar 18, 2013 at 10:07 pm
  • Hi, zookeeper.out is too large, how to reduce this file? it is a online system. Best R. beatls
    Hua beatlsHua beatls
    Mar 30, 2013 at 1:42 pm
    Apr 1, 2013 at 5:02 am
  • Given that HBase has it's own cache (block cache and bloom filters) and that all the table data is stored in HDFS, I'm wondering if HBase benefits from OS page cache at all. In the set up I'm using ...
    Pankaj GuptaPankaj Gupta
    Mar 20, 2013 at 4:08 pm
    Mar 26, 2013 at 3:02 am
  • Hi I am using HBase 0.94.2 currently. While using it , its write performance, due to compaction is being affeced by compaction. Please could you suggest some quick tips in relation to how to deal ...
    Tarang dawerTarang dawer
    Mar 22, 2013 at 11:45 am
    Mar 27, 2013 at 9:55 pm
  • We occasionally get scanner timeout errors such as "66698ms passed since the last invocation, timeout is currently set to 60000" when iterating a scanner through the Thrift API. Is there any reason ...
    Dan CrostaDan Crosta
    Mar 17, 2013 at 6:46 pm
    Mar 21, 2013 at 7:02 am
  • Hi all, I did some testing with HTableInterface#batch() for batching Increments and I was wondering about the returned value Object[]. As I understand (or would expect), the returned value would be ...
    Amit SelaAmit Sela
    Mar 14, 2013 at 5:35 pm
    Mar 15, 2013 at 12:22 am
  • Hi, I'm new to the list, just registered for this question. I'm setting up HBase in pseudo-distributed mode. I can run the hbase shell locally, and create tables, put some rows, they are present in ...
    Pal KonyvesPal Konyves
    Mar 20, 2013 at 12:03 am
    Mar 24, 2013 at 9:10 pm
  • Hi, We are using code similar to in order to benchmark our HBase cluster. We are running a CDH4 installation, and HBase is version ...
    Nicolas SeyvetNicolas Seyvet
    Mar 21, 2013 at 3:16 pm
    Mar 22, 2013 at 4:33 pm
  • Hi, I just want to scan data in memstore, but I saw InternalScan is private class. Is there a way i can do it without change the hbase source code? Thanks, Snake
    Mar 21, 2013 at 9:12 am
    Mar 23, 2013 at 7:11 am
  • I am trying to connect to hbase that I installed on hadoop that I installed on a ubuntu machine. when using hbase shell, I can create tables and get data. I cannot remotely connect to to hbase (using ...
    Mar 13, 2013 at 3:33 pm
    Mar 18, 2013 at 6:17 pm
  • Hi all, should I strictly use only oracle's java 6 only? will I really face problem if I am using openjdk7? if then then what type of problem I will face? is/are anyone using openjdk? or tried that ? ...
    Alok Singh MahorAlok Singh Mahor
    Mar 30, 2013 at 6:38 pm
    Mar 31, 2013 at 5:29 pm
  • Hi, We recently encountered a few issues about hbase server incorrect shutdown causing table corruption issues. Basically, if the HBase server was not gracefully shutdown using, instead ...
    Mar 15, 2013 at 10:45 pm
    Mar 16, 2013 at 4:01 am
  • Hi, All, I want to find all existing values for a given column in a HBase, and would that result in a full-table scan in HBase? For example, given a column C, the table is of very large number of ...
    Yun pengYun peng
    Mar 9, 2013 at 7:12 pm
    Mar 11, 2013 at 5:13 am
  • Hi, i have one question about rowkey design and presplit table. My usecase: I need store a lot of comments where each comment are for one article and this article has one category. What i need: 1) ...
    Lukáš DrbalLukáš Drbal
    Mar 4, 2013 at 10:49 am
    Mar 7, 2013 at 10:33 pm
  • We are running hbase 0.94.2, cdh4.2 edition. We have the local read shortcut enabled. Since updating to this version I've seen a bunch of WARN messages corresponding to exceptions trying to connect ...
    Bryan BeaudreaultBryan Beaudreault
    Mar 5, 2013 at 9:28 pm
    Mar 7, 2013 at 11:07 am
  • Hi, We are in process of migrating from 0.92.1 to 0.94.2. A coprocessor was running fine in 0.92. After migrating to 0.94, the client is timing out ( We are using ...
    Agarwal, SaurabhAgarwal, Saurabh
    Mar 28, 2013 at 10:19 pm
    Mar 29, 2013 at 2:25 pm
  • We recently upgraded multiple clusters to CDH 4.2, which comes with hbase 0.94.2 Since then We've seen region servers die periodically in a way I never saw before on CDH3. Here are the exceptions ...
    Bryan BeaudreaultBryan Beaudreault
    Mar 4, 2013 at 5:01 pm
    Mar 4, 2013 at 5:54 pm
  • 13/03/26 12:46:14 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect Connection refused at ...
    Gaurhari dassGaurhari dass
    Mar 26, 2013 at 7:25 am
    Jun 6, 2013 at 3:20 pm
  • I was wondering how I can go about evenly splitting an entire table in HBase during table creation[1]. I tried providing the empty byte arrays HConstants.EMPTY_START_ROW and HConstants.EMPTY_END_ROW ...
    Mar 20, 2013 at 10:35 pm
    Apr 4, 2013 at 4:30 am
  • After noticing a lot of threads, I turned on debugging logging for hbase client and saw this many times counting up constantly: HBaseClient:531 - IPC Client (687163870) connection to ...
    Jeff WhitingJeff Whiting
    Mar 29, 2013 at 6:42 pm
    Mar 29, 2013 at 8:06 pm
  • Hi, I am running HBase 0.94.6 with Hadoop 2.0.2-alpha. The log keeps printing the following message: 2013-03-25 19:32:15,469 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor: Scanned 1 catalog ...
    Jian FangJian Fang
    Mar 25, 2013 at 7:53 pm
    Mar 26, 2013 at 1:52 am
  • Hi, I would like to benchmark HBase using some of our distributed applications using custom developed benchmarking scripts/programs. I found the following clients are available. Could you please let ...
    Pradeep Kumar ManthaPradeep Kumar Mantha
    Mar 20, 2013 at 6:26 am
    Mar 20, 2013 at 5:03 pm
  • Hi, I have many small MySQL DBs (more than 1000) that need to transfer data into multiple (10) tables in one single hbase cluster concurrently. What will be the best recommended approach ? Thanks.
    Mar 14, 2013 at 4:27 pm
    Mar 15, 2013 at 4:01 pm
  • Hello, I want to import a file on HDFS from one cluster A (source) into HBase tables on a different cluster B (destination) using a Mapper job with an HBase sink. Both clusters run HBase. This setup ...
    David KochDavid Koch
    Mar 24, 2013 at 12:46 pm
    Mar 31, 2013 at 7:38 pm
  • Hello all, As I understand it, a common performance tweak is to disable major compactions so that you don't end up with storms taking things out at inconvenient times. I'm thinking that I should just ...
    Brennon ChurchBrennon Church
    Mar 21, 2013 at 1:47 pm
    Mar 22, 2013 at 1:14 am
  • It seems that the answer is no, but I just wanted to make sure I didn't miss something. As far as I can tell, scanning a column on a time range returns just the most recent value within that time ...
    Jonathan NatkinsJonathan Natkins
    Mar 7, 2013 at 5:09 pm
    Mar 7, 2013 at 5:37 pm
  • hi, if I want hbase support hdfs HA, does that difficult to add this feature? I just have some ideas, but I still need some advice. thanks.
    Azuryy YuAzuryy Yu
    Mar 29, 2013 at 3:05 pm
    Mar 30, 2013 at 7:08 pm
  • Hi, I'm trying to run HBase in distrbuted mode with 2 region servers, but when starting it, I'm getting the following error: starting master, logging to ...
    Anand nalyaAnand nalya
    Mar 28, 2013 at 3:31 pm
    Mar 28, 2013 at 6:26 pm
  • Dear, When I run two MR Jobs which will read same Hbase table and write to another same Hbase table at the same time. The result is one job successful finished. And another job crashed. And The ...
    Mar 26, 2013 at 6:17 am
    Mar 27, 2013 at 3:15 am
  • Hello, Is it possible to run a M/R on cluster A over a table that resides on cluster B with output to a table on cluster A? If so, how? I am interested in doing this for the purpose of copying part ...
    David KochDavid Koch
    Mar 18, 2013 at 10:10 pm
    Mar 26, 2013 at 2:50 pm
  • We are facing big region size but small region number of a table. 10 region servers, each has only one region with size over 10G, map slot of each task tracker is 12. We are planning to ‘split’ ...
    Lu, WeiLu, Wei
    Mar 25, 2013 at 10:03 am
    Mar 26, 2013 at 2:38 am
  • We have a requirement to support data matching while loading deltas to HBase. I see there is a utility to support bulk loading. But is there any way ...
    Jignesh PatelJignesh Patel
    Mar 21, 2013 at 4:04 pm
    Mar 24, 2013 at 12:44 pm
  • Hello everybody I saw the unusual status on WEB UI(see the attached image). But HBase Shell still works fine. I can scan, put, create table, drop table. Sometimes restarting HBase can get rid of this ...
    Kyle LinKyle Lin
    Mar 22, 2013 at 4:08 am
    Mar 22, 2013 at 6:24 am
  • Hi I have set up HBase and trying to use Thrift-Php to upload an image and then display it. Is there any example or tutorial containing the neccessary php? Thank you. -- View this message in ...
    Mar 14, 2013 at 1:07 pm
    Mar 15, 2013 at 4:25 pm
  • It seems to me that a major_compact table command from hbase shell do not fush memstore? When I done with major compact, still some data in memstore and will be flush out to disk when I shut down ...
    Liu, RaymondLiu, Raymond
    Mar 12, 2013 at 7:35 am
    Mar 13, 2013 at 5:35 am
  • When I try to access HBase from a cluster node which is not the zookeeper server I have the following problem: -bash-3.2$ hostname node33 -bash-3.2$ hbase shell HBase Shell; enter 'help<RETURN ' for ...
    Ryan ComptonRyan Compton
    Mar 12, 2013 at 8:48 pm
    Mar 12, 2013 at 9:21 pm
  • Hi, We are running some high load jobs which are mostly writes. During these jobs, compaction is triggered which takes sometime as longs as 40mins to complete. This causes blocking (as others wait ...
    Mar 4, 2013 at 6:45 am
    Mar 4, 2013 at 1:41 pm
  • I have a few use cases where I'd like to leverage HBase's high write throughput to blindly write lots of data even if most of it hasn't changed since the last write. I want to retain ...
    Matt CorganMatt Corgan
    Mar 3, 2013 at 3:43 am
    Mar 3, 2013 at 3:48 pm
  • I am reading the following mail: After running the following command (I am using Hadoop 1.0.4): bin/hadoop jar ...
    Jingguo yaoJingguo yao
    Mar 26, 2013 at 10:26 am
    Apr 1, 2013 at 11:07 am
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147 users for March 2013

Ted Yu: 109 posts Jean-Marc Spaggiari: 29 posts Ramkrishna vasudevan: 23 posts Lars hofhansl: 20 posts Anoop Sam John: 18 posts Andrew Purtell: 17 posts Michel Segel: 15 posts Kevin O'dell: 14 posts Kumar, Deepak8: 14 posts Bryan Beaudreault: 12 posts Jean-Daniel Cryans: 12 posts Michael Stack: 12 posts Yuling_c: 11 posts Dan Crosta: 11 posts Tariq: 11 posts Asaf Mesika: 10 posts Azuryy Yu: 10 posts Anoop John: 8 posts Kiran: 8 posts Mohit Anchlia: 8 posts
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