Grokbase Groups HBase user May 2013

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84 discussions - 633 posts

  • I have been attempting to speed up my HBase map-reduce scans for a while now. I have tried just about everything without much luck. I'm running out of ideas and was hoping for some suggestions. This ...
    Bryan KellerBryan Keller
    May 1, 2013 at 4:02 am
    Jul 1, 2013 at 9:35 pm
  • Hi, This is bad ... and happened twice: I had my replication-slave cluster offlined. I performed quite a massive Merge operation on it and after a couple of hours it had finished and I returned it ...
    Amit Mor MailAmit Mor Mail
    May 22, 2013 at 8:27 pm
    May 23, 2013 at 6:59 pm
  • Hi all, I am New to Hbase(Hadoop), and i am working on hbase with standalone mode.My application running well for some time, after that it displays INFO zookeeper.ClientCnxn: Client session timed ...
    May 9, 2013 at 1:40 pm
    May 15, 2013 at 12:12 pm
  • are there any tools out there that can help in visualizing data stored in Hbase? I know the shell lets you do basic stuff. But if I don't know what rowid I am looking for or if I want to rows with ...
    Aji JanisAji Janis
    May 21, 2013 at 9:58 pm
    Jun 2, 2013 at 11:00 am
  • Hi, I have Hbase configured in pseudo distributed mode on Machine A. I would like to connect to it through a Java program running on Machine B. But i am unable to do so.What configurations are ...
    Vimal JainVimal Jain
    May 22, 2013 at 9:27 am
    May 25, 2013 at 7:54 pm
  • Hi folks: Hope someone can shed some light on this - I cannot run "hbase shell" create commands because of the PleaseHoldException on a fresh install of hbase. Im not finding much in the error logs, ...
    Jay VyasJay Vyas
    May 21, 2013 at 8:18 pm
    May 22, 2013 at 3:39 pm
  • Hi, Any idea what can be the cause of a "Premature EOF: no length prefix available" error? 2013-05-02 14:02:41,063 INFO org.apache.hadoop.hdfs.DFSClient: Exception in createBlockOutputStream ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    May 2, 2013 at 7:28 pm
    May 5, 2013 at 11:35 am
  • Hi, My setup is as follows: 24 regionservers (7GB RAM, 8-core CPU, 5GB heap space) hbase 0.94.4 5-7 regions per regionserver I am doing an avg of 4k-5k random gets per regionserver per second and the ...
    Viral BajariaViral Bajaria
    May 16, 2013 at 9:17 am
    May 17, 2013 at 8:27 pm
  • Hi, Do people spread HBase clusters over multiple EC2 Availability Zones, or is that a big no-no? Cross-AZ communication is supposedly going over fast fiber optic cables. Thanks, Otis -- Search ...
    Otis GospodneticOtis Gospodnetic
    May 6, 2013 at 5:37 pm
    May 7, 2013 at 12:01 am
  • We are running hbase 0.94.6 in a concurrent environment and we are seeing the majority of our code stuck in this method at the synchronized block (line 997). Is there some configuration we can change ...
    May 30, 2013 at 3:55 am
    Jun 6, 2013 at 6:57 pm
  • Hi, all. In our hbase cluster, there are many logs like below: 2013-05-13 00:00:04,161 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: java.lang.IllegalArgumentException at ...
    Bing JiangBing Jiang
    May 13, 2013 at 1:25 am
    May 13, 2013 at 8:34 am
  • Lets say I have the following in my table: col1 row1 v1 ------ HFile entry would be "row1,col1,ts1-- v1" ol1 row1c v2 ------ HFile entry would be "row1c,ol1,ts1-- v2" Now I issue a prefix scan asking ...
    Varun SharmaVarun Sharma
    May 16, 2013 at 8:56 pm
    May 17, 2013 at 7:41 am
  • Hi, When we are doing an export, we are only exporting the data. Then when we are importing that back, we need to make sure the table is pre-splitted correctly else we might hotspot some servers. If ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    May 7, 2013 at 10:24 pm
    May 14, 2013 at 12:58 am
  • Hi, Has anyone got some recommendations about running HBase on EC2? I am testing it, and so far I am very disappointed with it. I did not change anything about the default 'Amazon distribution' ...
    Pal KonyvesPal Konyves
    May 8, 2013 at 2:02 am
    May 12, 2013 at 5:14 am
  • HI, We are using hbase 0.94, but today I find I cannot 'create' a new table using hbase shell, hbase 'disable' cannot work either. Hbase 'list' and 'scan' still works. What the problem, any way to ...
    May 9, 2013 at 4:10 pm
    May 9, 2013 at 4:59 pm
  • Hi, I am seeing the following which is a JVM segfault: hbase-regionser[28734]: segfault at 8 ip 00007f269bcc307e sp 00007fff50f7e638 error 4 in[7f269bc51000+1b5000] Benoit Tsuna reported ...
    Varun SharmaVarun Sharma
    May 1, 2013 at 8:54 pm
    May 6, 2013 at 7:30 am
  • We're moving from ingesting our data via the Thrift API to inserting our records via a MapReduce job. For the MR job I've used the exact same job setup from HBase DefG, page 309. We're running ...
    May 29, 2013 at 3:28 pm
    Jun 4, 2013 at 11:08 pm
  • Hi, I have the dfs.block.size value set to 1 GB in my cluster configuration. I have around 250 GB of data stored in hbase over this cluster. But when i check the number of blocks, it doesn't ...
    Praveen BysaniPraveen Bysani
    May 13, 2013 at 6:52 am
    May 14, 2013 at 2:24 am
  • Hi, I have a couple of questions about HBase replication... 1) When we ship edits to slave cluster - do we retain the timestamps in the edits - if we don't, I can imagine hitting some inconsistencies ...
    Varun SharmaVarun Sharma
    May 19, 2013 at 7:14 pm
    May 20, 2013 at 11:33 pm
  • Hi Hbase users, We have a use case where we need to know how data looked at a given time in past. The data is stored in HBase of course, with multiple versions. And, the goal is to be able to ...
    Gaurav PanditGaurav Pandit
    May 6, 2013 at 5:28 pm
    May 6, 2013 at 6:35 pm
  • Hello list, Any one can give me some follow up information about this issue HBASE-3529, I'm wondering it has more than 2 years no update. Best, -- *Rick Dong*
    May 31, 2013 at 2:06 am
    May 31, 2013 at 10:15 am
  • One of our production clusters had several region server failures. As a result one of the tables is in an inconsistent state as reported by hbck. We have tried using hbck repair commands but none ...
    Jay TalrejaJay Talreja
    May 21, 2013 at 3:09 pm
    May 29, 2013 at 4:51 pm
  • I have a HBase table with a single column family and columns are added to it over time. These columns are named as the timestamp they were created, so unless I query the row I do not know what all ...
    Vinod VVinod V
    May 25, 2013 at 11:54 pm
    May 28, 2013 at 2:43 pm
  • I have not been able to bring up a simple standalone hbase pseuo distributed mode cluster on a single ubuntu 12.x machine. A couple of co-workers that have been using hbase for years also looked at ...
    Stephen BoeschStephen Boesch
    May 22, 2013 at 7:34 pm
    May 22, 2013 at 10:59 pm
  • Hi, When our customers(using TSDB) loads large amount of data into HBase, we saw many NullPointerException in the RS logs as below. I checked the source code, it seems when trying to obtain the lock ...
    Tianying ChangTianying Chang
    May 16, 2013 at 5:13 pm
    May 20, 2013 at 5:33 pm
  • We are pleased to announce the immediate availability of Phoenix 1.2 ( Here are some of the release highlights: * Improve performance of ...
    James TaylorJames Taylor
    May 16, 2013 at 7:30 pm
    May 20, 2013 at 4:36 pm
  • Hi, I know that HBase supports secure RPC between its nodes (Master, Region Server). I have couple of questions about it: 1. Does HBase supports secure RPC between Master and Slave replications? 2 ...
    Asaf MesikaAsaf Mesika
    May 9, 2013 at 8:35 am
    May 20, 2013 at 8:10 am
  • Hi, I wonder if there are tool similar to org.apache.hadoop.hbase.mapreduce.ImportTsv. IimportTsv read from tsv file and create HFiles which are ready to be loaded into the corresponding region by ...
    Jinyuan ZhouJinyuan Zhou
    May 17, 2013 at 2:52 pm
    May 17, 2013 at 8:36 pm
  • Hi Say, I have four field for one record :id, status, targetid, and count. Status is on and off, target could reference other id, and count will record the number of "on" status for all targetid from ...
    Liu, RaymondLiu, Raymond
    May 8, 2013 at 7:22 am
    May 13, 2013 at 7:42 am
  • Hello list, Does Hbase read the environment variables set in *~/.bashrc*file everytime I issue *bin/*??What could be the possible reasons for that?Specially if I have a standalone setup ...
    Mohammad TariqMohammad Tariq
    May 11, 2013 at 7:39 pm
    May 11, 2013 at 11:33 pm
  • Hi, Using the HBase thrift API, and Java as a programming language, it seems that when setting a value in a Mutation : Mutation mutation = new Mutation(); mutation.setIsDelete(false) ...
    Nicolas SeyvetNicolas Seyvet
    May 3, 2013 at 1:23 pm
    May 3, 2013 at 2:29 pm
  • Hi, Currently in Gora, we support the following table attributes, which we specify when mapping data into HBase; compression, blockCache, blockSize, bloomFilter, maxVersions, timeToLive, inMemory ...
    Lewis John McgibbneyLewis John Mcgibbney
    May 1, 2013 at 6:41 pm
    May 1, 2013 at 7:06 pm
  • Hi, What is the best hbase table schema for following json data? I need to store following JSON data in hbase. {"Session"":{"Header" ...
    AnilKumar BAnilKumar B
    May 30, 2013 at 3:48 am
    Jun 1, 2013 at 2:37 pm
  • Is there a faster way to get the count of rows in a HBase table (potentially a huge one)? I am looking for ways other than the 'count' shell command or any Pig script? Thanks. Regards, Shahab
    Shahab YunusShahab Yunus
    May 28, 2013 at 10:23 pm
    May 29, 2013 at 1:54 pm
  • Hi, I configured HDFS ha using QJM, so I configured hbase as following: <property <name hbase.rootdir</name <value hdfs://test-cluster</value </property test-cluster is my name sevice ID in my HDFS ...
    Azuryy YuAzuryy Yu
    May 24, 2013 at 10:12 am
    May 24, 2013 at 10:40 am
  • Hello, I am working with Hlogs of Hbase and I have this doubt that HDFS shows size of last log file as zero. But when I open it I see data in it. When I add extra data a new file with zero size is ...
    Rishabh AgrawalRishabh Agrawal
    May 17, 2013 at 10:54 am
    May 17, 2013 at 2:38 pm
  • Hi, We are still very new at all of this hbase/hadoop/mapreduce stuff. We are looking for the best practices that will fit our requirements. We are currently using the latest cloudera vmware's ...
    David PoissonDavid Poisson
    May 31, 2013 at 8:20 pm
    Jun 5, 2013 at 4:04 pm
  • Hi, I am wondering what happens when we add the following: row, col, timestamp -- v1 A flush happens. Now, we add row, col, timestamp -- v2 A flush happens again. In this case if MAX_VERSIONS == 1, ...
    Varun SharmaVarun Sharma
    May 16, 2013 at 6:49 pm
    May 17, 2013 at 6:08 am
  • Hi all, I'm trying to scan my HBase table to get only rows that are missing some qualifiers. I read that for getting rows with specific qualifiers I should use something like: List list = new ...
    Amit SelaAmit Sela
    May 8, 2013 at 1:53 pm
    May 14, 2013 at 3:40 pm
  • Hi, I have a strange RIT problem with a single region of our biggest table. After an hbck (wondering why it only discovered it at that time) it started trying to assign a region which has been ...
    Dimitri GoldinDimitri Goldin
    May 2, 2013 at 2:18 pm
    May 7, 2013 at 3:58 pm
  • Hi ! I've been working on installing HBASE using a shell script over some nodes. I can't help but think that someone else may have tried this before, if someone wants to share a gist or script from ...
    Jay VyasJay Vyas
    May 29, 2013 at 5:50 pm
    Jun 2, 2013 at 1:25 am
  • Hi, All, Given a large-sized BlockCache, I am wondering how HBase performs to search a block of a requested rowkey. Is there any index structure (in-memory) inside BlockCache? or it search in a brute ...
    Yun pengYun peng
    May 29, 2013 at 11:11 am
    May 29, 2013 at 12:16 pm
  • Hello, I'm setting up a jenkins job for hbase, building branch 0.95 (from github) under jdk 6. However sometimes the build pasts, sometimes does not. Several tests are likely to fail, such as ...
    Lisen MuLisen Mu
    May 29, 2013 at 6:22 am
    May 29, 2013 at 10:35 am
  • Section 2.1.3 says that Hadoop 1.0.4 works with HBase-0.94.x [1]. And Section says that 1.0.4 has a working durable sync. But when I check the source code of DFSClient.DFSOutputStream's sync ...
    Jingguo yaoJingguo yao
    May 28, 2013 at 2:09 pm
    May 29, 2013 at 1:54 am
  • Hi,all I want to know how RS eliminates the unnecessary hlogs. lastSeqNum stores <RegionName, latest KV Seq id and outputfiles stores <last Seq id before new hlog file, file path So, how does rs ...
    Bing JiangBing Jiang
    May 22, 2013 at 12:39 pm
    May 23, 2013 at 5:28 pm
  • Hey all, We're wanting to add 10 additional nodes to our 20-node HBase cluster. Our tables are pre-split into 800 regions, 40 regions to a machine. What will happen when we add 10 new nodes to the ...
    Jeremy pJeremy p
    May 15, 2013 at 6:27 pm
    May 15, 2013 at 8:38 pm
  • Hi, I was looking at PrefixFilter but going by the implementation - it looks we scan every row until we hit the prefix instead of seeking to the row with the required prefix. I was wondering if there ...
    Varun SharmaVarun Sharma
    May 15, 2013 at 6:34 am
    May 15, 2013 at 3:00 pm
  • Hi, We are using Hbase 0.94.1. There is dependency from Hbase to Jruby. I found below in hbase-0.94.1.pom. <dependency <groupId org.jruby</groupId <artifactId jruby-complete</artifactId <version ...
    May 10, 2013 at 9:33 pm
    May 11, 2013 at 8:46 am
  • Hi, I have been consistently hitting the following error in one of my QA clusters. I came across two JIRAs, the first one (HBASE-3466) was closed saying "Cannot Reproduce" but a new one was re-opened ...
    Viral BajariaViral Bajaria
    May 6, 2013 at 5:16 am
    May 6, 2013 at 5:30 pm
  • Hello, I've just started to discover coprocessors. Namely the classes BaseEndpointCoprocessor and BaseRegionObserver. I need the postPut() method and than some special user calls. So I need both, but ...
    Pavel HančarPavel Hančar
    May 3, 2013 at 10:34 am
    May 3, 2013 at 4:54 pm
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117 users for May 2013

Ted Yu: 51 posts Yves S. Garret: 45 posts Varun Sharma: 32 posts Mohammad Tariq: 28 posts Jean-Marc Spaggiari: 22 posts Jay Vyas: 21 posts Jean-Daniel Cryans: 20 posts Michael Stack: 19 posts Michel Segel: 16 posts Vimal Jain: 15 posts Asaf Mesika: 14 posts Bryan Keller: 14 posts Lars hofhansl: 14 posts Andrew Purtell: 13 posts Anoop John: 13 posts Ramkrishna vasudevan: 13 posts Amit Mor Mail: 12 posts James Taylor: 12 posts Raju muddana: 12 posts Amandeep Khurana: 11 posts
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