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117 discussions - 798 posts

  • hi what's the recommended nodes for NN, hmaster and zk nodes for a larger cluster, lets say 50-100+ also, what would be the ideal replication factor for larger clusters when u have 3-4 racks ? -- ...
    David CharleDavid Charle
    Nov 26, 2012 at 1:54 pm
    Dec 20, 2012 at 10:11 pm
  • Hi, I am trying to load lot of data (around 1.5 TB) into a single Hbase table. I have setup region size at 2 GB. I also set hbase.regionserver.handler.count at 30. When I start loading data via MR, ...
    Ameya KantikarAmeya Kantikar
    Nov 1, 2012 at 7:03 am
    Nov 3, 2012 at 12:11 am
  • Hi, With gracious help on this forum (from ramkrishna vasudevan) I've managed to setup HBase 0.94.2 in standalone mode on Ubuntu, and proceeded to writing a small client. I am trying to run the ...
    MatanMatan
    Nov 25, 2012 at 8:37 pm
    Feb 6, 2013 at 1:05 pm
  • hi,all. I want to describe a phenomenon that happens to our hbase cluster. I use puts(List<Put ) to insert many records with writing hlog enable, and some time later I delete all of these records ...
    Bing JiangBing Jiang
    Nov 21, 2012 at 12:38 pm
    Nov 22, 2012 at 6:50 am
  • Hi, all. I have a simple question: does hbase.hregion.max.filesize have a limit? May I specify a very large value to this? like 40G or more? (don't consider the performance) I didn't find any ...
    Cheng SuCheng Su
    Nov 1, 2012 at 5:23 am
    Nov 2, 2012 at 1:20 am
  • Hi all, we just upgraded our HBase cluster from 0.90.3 to 0.92.1 and now we have a lot of warnings like these in our clients: 2012-11-15 01:31:57,734 | WARN | <our thread | ...
    Guillaume PerrotGuillaume Perrot
    Nov 15, 2012 at 1:22 pm
    Nov 22, 2012 at 7:50 pm
  • If I understand correctly, an HTable has two composite atomic operations, checkAndPut and checkAndDelete. The check part checks just a single column's value. Why not allow checking more than one ...
    Mike SpreitzerMike Spreitzer
    Nov 18, 2012 at 3:31 am
    Nov 30, 2012 at 2:56 am
  • Hi, I have a requirement of physicalising the logical model... I have a client model which has 600+ entities... Need suggestion how to go about physicalising it... I have few other doubts : 1) ...
    Ramasubramanian NarayananRamasubramanian Narayanan
    Nov 26, 2012 at 7:05 am
    Nov 29, 2012 at 9:30 am
  • hi all, i m now running hbase on pseudo-distributed mode, and when i open hbase webUI: http://localhost:60010/master.jsp,its give an error: Trying to contact region server null for region , row '', ...
    Wanli gaoWanli gao
    Nov 21, 2012 at 3:45 pm
    Nov 22, 2012 at 2:37 am
  • hi Ramkrishna 5 tables on this node is using gzip compression. At first I assumed this was caused by gzip compression, but as u can see from my google-perftools profiling result above that there is ...
    Yusup AshrapYusup Ashrap
    Nov 21, 2012 at 5:22 am
    Nov 21, 2012 at 5:31 pm
  • Hi, All, I want to measure the duration of a major compaction in HBase. Since the function call majorCompact is asynchronous, I may need to manually check when the major compaction is done. Does ...
    Yun pengYun peng
    Nov 8, 2012 at 6:08 am
    Nov 17, 2012 at 1:04 am
  • Check your UI. Does it show any regions in transition? Can you try doing kill -9 and restart the region server. Regards Ram
    Ramkrishna vasudevanRamkrishna vasudevan
    Nov 15, 2012 at 5:26 pm
    Nov 22, 2012 at 2:32 am
  • Take a look at AggregationClient.java and TestAggregateProtocol.java Cheers
    Ted YuTed Yu
    Nov 10, 2012 at 10:25 pm
    Nov 20, 2012 at 6:02 pm
  • Hi, In my application my row values are doubles. I would like my scans to traverse the rows in order of increasing values. But if I simply use double d = .... byte[] row = Bytes.toBytes(d); I will ...
    Jonathan BishopJonathan Bishop
    Nov 5, 2012 at 6:42 pm
    Dec 1, 2012 at 3:27 pm
  • Dear all, I checked the Zookeeper site and found the latest stable release is 3.4.5, and although there's only 2 bug fixes from zk 3.4.4 to 3.4.5, there're more than 50 bug fixes from 3.4.3 to 3.4.4, ...
    Yu LiYu Li
    Nov 29, 2012 at 9:17 am
    Nov 30, 2012 at 5:39 am
  • Hi all, I want to setup HBase in standalone mode on local filesystem. I want to use local file system so I guess no need to install hadoop and zookeeper. I followed the instructions from ...
    Alok Singh MahorAlok Singh Mahor
    Nov 26, 2012 at 10:27 am
    Nov 28, 2012 at 3:07 pm
  • Hi, My standalone HBase instance, installed as per the 'getting started' section at http://hbase.apache.org/book/quickstart.html, doesn't work insofar. I get in the log file: 2012-11-23 18:26:37,827 ...
    MatanMatan
    Nov 24, 2012 at 8:46 am
    Nov 27, 2012 at 12:35 pm
  • Hotspotting is bound to happen until the region starts splitting and gets assigned to diff region servers. Regards Ram On Wed, Nov 21, 2012 at 12:49 PM, Ajay Bhosle wrote:
    Ramkrishna vasudevanRamkrishna vasudevan
    Nov 21, 2012 at 8:20 am
    Nov 22, 2012 at 7:50 pm
  • Hi Matan Yes for every cell in the Hfile the rowkey, col family will be repeating. That is because every cell is unique wrt to the rowkey, colfamily and the qualifier. To encode this we have some ...
    Ramkrishna vasudevanRamkrishna vasudevan
    Nov 28, 2012 at 2:32 pm
    Nov 29, 2012 at 4:29 am
  • I'd appreciate any suggestions as to how to get HBase up and running. Right now it dies after a few seconds on all servers. I am using Hadoop 1.0.4, ZooKeeper 3.4.4 and HBase 0.94.2 on Ubuntu ...
    Ratner, Alan S (IS)Ratner, Alan S (IS)
    Nov 21, 2012 at 8:03 pm
    Nov 26, 2012 at 12:45 am
  • Hello all, As we do paging in solr using start and rowCount I need to implement same through hbase. In Detail: I have 1000 rows data which I need to display in 10 pages each page containing 100 ...
    VajrakumarVajrakumar
    Nov 21, 2012 at 6:05 pm
    Nov 23, 2012 at 5:45 am
  • Hi, This book was recently mentioned here - 'HBase:The Definitive Guide' <http://www.amazon.com/HBase-Definitive-Guide-Lars-George/dp/1449396100 . How much would you say is that book still up-to-date ...
    MatanMatan
    Nov 29, 2012 at 10:09 am
    Nov 29, 2012 at 10:42 pm
  • Dear all, I want to understand when to use HTable, HTablePool and HtableAdmin in Java API ? I tried to read Hbase book, but I got confused.. So any help please? How to insert data using Put in a ...
    Dalia SobhyDalia Sobhy
    Nov 17, 2012 at 6:15 pm
    Nov 19, 2012 at 1:52 pm
  • Hi Varun, HDFS-3703 and HDFS-3912 are about this. The story is not over yet (and there are other stuff like HDFS-3704, HDFS-3705, HDFS-3706), but it helps by lowering the probability to go to a dead ...
    Nicolas LiochonNicolas Liochon
    Nov 7, 2012 at 9:57 am
    Nov 7, 2012 at 9:53 pm
  • Hi, We need to change columns of Hbase table from one column family to another column family . Example :- HBase table Name :- emp Column family :- cf1 Under the column family cf1, we have the ...
    Raviprasad TRaviprasad T
    Nov 28, 2012 at 8:58 am
    Nov 28, 2012 at 12:11 pm
  • As far as i see altering the table with the new columnfamily should be easier. - disable the table - Issue modify table command with the new col family. - run a compaction. Now after this when you ...
    Ramkrishna vasudevanRamkrishna vasudevan
    Nov 28, 2012 at 4:54 am
    Nov 28, 2012 at 9:37 am
  • HI I am unable to create a Table in hbase dynamically am using the following code if (!TABLE_EXISTS) { try{ *admin.createTable(htable);* }catch(Exception e){ e.printStackTrace(); } TABLE_EXISTS = ...
    Shyam kumarShyam kumar
    Nov 26, 2012 at 5:25 pm
    Nov 27, 2012 at 4:16 pm
  • Hi Chris, My two cents... IMHO, onus of ensuring the right Timestamp value should always be on the application logic rather than HBase. Essentially, timestamp is long number in HBase. So, Timestamp ...
    Anil guptaAnil gupta
    Nov 19, 2012 at 7:45 am
    Nov 19, 2012 at 9:27 pm
  • Hi, I'm trying to merge 2 regions based on the book documentation and I'm getting the exception at the bottom of this message. Any idea why? I got the regions names from the HTML UI. I tried also to ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Nov 18, 2012 at 1:59 pm
    Nov 19, 2012 at 2:31 am
  • Hi all, I'm trying to bulk load using LoadIncrementalHFiles and I get a NullPointerException at: org.apache.hadoop.io.compress.zlib.ZlibFactory.isNativeZlibLoaded(ZlibFactory.java:63). It looks like ...
    Amit SelaAmit Sela
    Nov 6, 2012 at 10:29 am
    Nov 15, 2012 at 4:09 pm
  • Hello, Every now and then we need to flatten our cluster and re-import all data from log files (changes in data format, etc.) Afterwards we notice a significant increase in scan performance. As data ...
    David KochDavid Koch
    Nov 3, 2012 at 3:13 pm
    Nov 5, 2012 at 6:52 pm
  • I have a need to move hbas-site.xml to an external location. So in order to do that I changed my configuration as shown below. But this doesn't seem to be working. It picks up the file but I get ...
    Mohit AnchliaMohit Anchlia
    Nov 26, 2012 at 10:17 pm
    Nov 30, 2012 at 5:13 am
  • Dear all, I wanted to ask a question.. Do Hbase Aggregate Functions such as rowcount, getMax, get Average use MapReduce to execute those functions? Thanks :D
    Dalia SobhyDalia Sobhy
    Nov 24, 2012 at 5:15 pm
    Nov 25, 2012 at 1:17 pm
  • Hi all, Anyone has any idea why scanning over specific range in a table is about 20% slower if that data (that specific range) was just inserted into HBase using bulk load ? I do the bulk load ...
    Amit SelaAmit Sela
    Nov 12, 2012 at 2:39 pm
    Nov 23, 2012 at 5:23 pm
  • HBase 0.92+ onwards has had support for Apache Hadoop 2.x+ along with Apache Hadoop 1.x. The note on the web manual says that: "As of Apache HBase 0.96.x, Apache Hadoop 1.0.x at least is required. We ...
    Harsh JHarsh J
    Nov 22, 2012 at 6:50 pm
    Nov 22, 2012 at 7:44 pm
  • HBase fans, I’m writing to announce the first release of KijiSchema, a new project to help developers build applications on HBase. You can download it at www.kiji.org. It is open source and published ...
    Aaron KimballAaron Kimball
    Nov 14, 2012 at 10:19 pm
    Nov 21, 2012 at 2:56 pm
  • When you start the new cluster with 0.92.1, hbase would migrate your data to 0.92 format. Thanks
    YuzhihongYuzhihong
    Nov 17, 2012 at 2:55 pm
    Nov 17, 2012 at 9:29 pm
  • Hi, I created a table in hbase shell with pre split create 'Test','C',{SPLITS= ['\0x1','\0x2','\0x3','\0x4','\0x5']} when i put a new value using put command in hbase shell the request is passed to ...
    MsmdhussainMsmdhussain
    Nov 15, 2012 at 6:09 pm
    Nov 16, 2012 at 7:33 am
  • Hi everyone I'm currently testing Hbase/Hadoop in terms of performance but also in terms off applicability. After some tries, and reads I'm wondering If Hbase is well fitted for the current need I'm ...
    Nick maillardNick maillard
    Nov 8, 2012 at 9:01 am
    Nov 8, 2012 at 7:12 pm
  • Hi All, I am developing a Coprocessor to sort results on the basis of Cell Value. Basically an equivalent of order by clause in RDBMS. In my subclass of BaseEndpointCoprocessor i would like to do ...
    Anil guptaAnil gupta
    Nov 30, 2012 at 6:55 pm
    Mar 7, 2013 at 1:00 pm
  • Dear all, I have two tables, named test and tracking. For every put in the test table, I defined a postPut trigger to insert the same data into tracking table. I tested about 50 thousands tuples. The ...
    YonghuYonghu
    Nov 30, 2012 at 7:43 am
    Dec 3, 2012 at 2:32 am
  • Hi, I have a master master replication setup with hbase 0.94.0 - if only write to cluster A and replication carries over the data to cluster B. I am having some really weird issues with cluster B ...
    Varun SharmaVarun Sharma
    Nov 30, 2012 at 11:47 am
    Nov 30, 2012 at 6:12 pm
  • Hi, I turned off automatic major compactions and tried to major compact all regions via both the region server interface and doing a major_compact on the table from the shell. Nothing seems to ...
    Varun SharmaVarun Sharma
    Nov 30, 2012 at 7:42 am
    Nov 30, 2012 at 11:26 am
  • Hi, I'm using hbase version 0.94.1 and hadoop version 1.0.3 I'm running HBase + HDFS on a 4 node cluster (48 GB RAM, 12TB DiskSpace on each node). 1 HMaster + NameNode and 3 HRegionServer + DataNode ...
    Arati PatroArati Patro
    Nov 29, 2012 at 6:33 am
    Nov 30, 2012 at 10:34 am
  • I have a table who's keys are prefixed with a byte to help distribute the keys so scans don't hotspot. I also have a bunch of slave processes that work to scan the prefix partitions in parallel ...
    Sean McNamaraSean McNamara
    Nov 28, 2012 at 6:28 am
    Nov 29, 2012 at 11:16 pm
  • Here's one way: http://hadoop-hbase.blogspot.com/2012/04/timestamp-consistent-backups-in-hbase.html From: David Charle <<span class="m_body_email_addr" title="9031824399060a94df09338a5ce87cab" ...
    Lars hofhanslLars hofhansl
    Nov 15, 2012 at 5:48 pm
    Nov 27, 2012 at 6:30 pm
  • Hi all, I have set up standalone Hbase on my laptop. HBase shell is working fine. and I am not using hadoop and zookeeper I found one frontend for HBase ...
    Alok Singh MahorAlok Singh Mahor
    Nov 26, 2012 at 4:30 pm
    Nov 27, 2012 at 9:42 am
  • Dear All, I am currently using Hadoop 0.23.1 with HBase 0.94.1 in a pseudo-distributed mode. I am trying to use HBase Thrift API (not using Thrift2 yet) in a nonblocking and async mode to insert a ...
    Pankaj MisraPankaj Misra
    Nov 19, 2012 at 12:17 pm
    Nov 22, 2012 at 12:56 pm
  • Hi, I want to setup a master-master replicated cluster using Hbase 0.94 - the two clusters will be in different availability zones. I was wondering if the following would work: 1) Setup cluster A and ...
    Varun SharmaVarun Sharma
    Nov 13, 2012 at 9:36 pm
    Nov 13, 2012 at 11:56 pm
  • Hi All, We are happy to announce release of Kundera 2.2. Kundera is a JPA 2.0 based, object-datastore mapping library for NoSQL datastores. The idea behind Kundera is to make working with NoSQL ...
    Amresh Kumar SinghAmresh Kumar Singh
    Nov 8, 2012 at 6:22 pm
    Nov 10, 2012 at 12:36 am
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137 users for November 2012

Jean-Marc Spaggiari: 58 posts Ramkrishna vasudevan: 36 posts Mohammad Tariq: 34 posts Michael Stack: 30 posts Michel Segel: 30 posts Ted Yu: 22 posts Kevin O'dell: 21 posts Varun Sharma: 21 posts Jeremy Carroll: 18 posts Cheng Su: 16 posts Matan: 16 posts Dalia Sobhy: 15 posts Anil gupta: 14 posts Jean-Daniel Cryans: 14 posts Jeff Whiting: 14 posts Yun peng: 13 posts Ameya Kantikar: 12 posts Ac: 11 posts Lars hofhansl: 11 posts Marcos Ortiz Valmaseda: 11 posts
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