Grokbase Groups HBase user July 2013

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127 discussions - 694 posts

  • Hi there, I know how to create MapReduce job with HBase data source only or HDFS file as data source. Now I need to create a MapReduce job with mixed data sources, that is, this MR job need to read ...
    S. ZhouS. Zhou
    Jul 3, 2013 at 4:35 am
    Jul 12, 2013 at 3:50 pm
  • Hi there, I'm trying to upgrade from 0.94.6 (distributed mode) to 0.94.8 and I'm seeing strange WARN messages leading in region-less regionserver once updated. Here is the kind of lines I can find ...
    Adrien MogenetAdrien Mogenet
    Jul 12, 2013 at 10:33 pm
    Sep 2, 2013 at 4:47 pm
  • I've been trying to run examples from HBase-The definitve guide and i've been encountering with this error and i'm not able to get past it. I'm running in Stand alone mode if that helps. Exception in ...
    Pavan SudheendraPavan Sudheendra
    Jul 15, 2013 at 11:38 am
    Jul 17, 2013 at 4:49 am
  • I think there is a metric in HBase and HDFS (JMX) reflecting that. If you find it and find it useful, do tell...
    Asaf MesikaAsaf Mesika
    Jul 4, 2013 at 6:34 am
    Jul 5, 2013 at 8:21 am
  • Hello: We have an HBase cluster with region servers running on 8GB heap size with a 0.6 block cache (it is a read heavy cluster, with bursty write traffic via MR jobs). (version: hbase- ...
    Suraj VarmaSuraj Varma
    Jul 8, 2013 at 6:09 pm
    Jul 10, 2013 at 3:25 am
  • The section on Rows vs. Columns at talks about expanding horizontally vs. vertically. Can someone please explain to me when to choose rows vs ...
    Aji JanisAji Janis
    Jul 2, 2013 at 1:33 pm
    Jul 8, 2013 at 3:28 pm
  • I am having problems while scanning a table created using HFile. This is what I am doing - Once Hfile is created I use following code to bulk load LoadIncrementalHFiles loadTool = new ...
    Rohit KelkarRohit Kelkar
    Jul 12, 2013 at 3:50 pm
    Jul 17, 2013 at 12:21 am
  • Hi, I would like to explain our use case of HBase, the row key design and the problems we are having so anyone can give us a help: The first thing we noticed is that our data set is too small ...
    Demian BerjmanDemian Berjman
    Jul 30, 2013 at 8:37 pm
    Jul 31, 2013 at 8:09 pm
  • Hi to everybody, in my use case I have to perform batch analysis skipping old data. For example, I want to process all rows created after a certain timestamp, passed as parameter. What is the most ...
    Flavio PompermaierFlavio Pompermaier
    Jul 2, 2013 at 4:14 pm
    Jul 4, 2013 at 9:48 am
  • Hi, There was talk of G1 and HBase here over the past few days. I wanted to share a fresh and telling SPM graph showing G1 + some other params in action: Result first ...
    Otis GospodneticOtis Gospodnetic
    Jul 10, 2013 at 7:01 pm
    Jul 11, 2013 at 11:26 pm
  • Hello, NOTE: I posted the same message in the the Cloudera group. Since upgrading from CDH 4.0.1 (HBase 0.92.4) to 4.3.0 (HBase 0.94.6) we systematically experience problems with region servers ...
    David KochDavid Koch
    Jul 12, 2013 at 10:10 am
    Jul 17, 2013 at 8:06 am
  • Hi, TL;DR; Trying to make a case for making the block eviction strategy smart and to not evict remote blocks more frequently and make the requests more smarter. The question here comes after I ...
    Viral BajariaViral Bajaria
    Jul 8, 2013 at 10:05 am
    Jul 9, 2013 at 12:20 am
  • Hi all, I'm having a lot of handlers (90 - 300 aprox) being blocked when reading rows. They are blocked during changedReaderObserver registration. Does anybody else run into the same issue? Stack ...
    Pablo MedinaPablo Medina
    Jul 30, 2013 at 3:05 am
    Jul 30, 2013 at 2:11 pm
  • Hello, I am trying to get some advice on pros/cons of using separator/delimiter as part of HBase row key. Currently one of our user activity tables has a rowkey design of "UserID^TimeStamp" with a ...
    Jason HuangJason Huang
    Jul 8, 2013 at 2:20 pm
    Jul 9, 2013 at 1:10 am
  • Hi All, I am using HBase in distributed mode. A number of master and regionserver nodes are running on different machines. Now i want to upgrade HBase version to recent stable release. My main ...
    Hanish BansalHanish Bansal
    Jul 4, 2013 at 2:10 pm
    Jul 6, 2013 at 7:18 pm
  • i insert 2GB data into my hbase cluster ,but i find the region is not balance,is insert operation always cause the region number different on region server? here is my 60010 output Table Regions Name ...
    Ch huangCh huang
    Jul 4, 2013 at 5:21 am
    Jul 5, 2013 at 2:25 am
  • Hi, I am fairly new to Hbase. We are trying to setup OpenTSDB system here and just started setting up production clusters. We have 2 datacenters, on a west/east coasts and we want to have 2 ...
    Anusauskas, LaimonasAnusauskas, Laimonas
    Jul 17, 2013 at 4:07 pm
    Jul 17, 2013 at 11:03 pm
  • Hi HBase users, We have created a index table (say T2) of another table (say t1). The clients who write to T1 also write a index record to T2 with the same timestamp. There may be accumulated ...
    Chao ShiChao Shi
    Jul 15, 2013 at 3:14 pm
    Jul 17, 2013 at 3:36 am
  • Hello everyone, could anyone tell me small query? Does Hbase decompress data before executing query or it execute queries on compressed data? and how snappy and lzo actually behave ? thanks
    Alok Singh MahorAlok Singh Mahor
    Jul 11, 2013 at 1:18 pm
    Jul 13, 2013 at 6:12 pm
  • If someone was contemplating running multiple HBase region servers per node, what would you tell him? I've lots of RAM on my machines and I want HBase to be able to make the most of it. Heaps larger ...
    Sudarshan Kadambi (BLOOMBERG/ 731 LEXIN)Sudarshan Kadambi (BLOOMBERG/ 731 LEXIN)
    Jul 29, 2013 at 9:20 pm
    Jul 31, 2013 at 6:53 pm
  • How do i get the row key by specifying a row value assuming row values are unique? What API should i use for this purpose? -- Regards- Pavan
    Pavan SudheendraPavan Sudheendra
    Jul 31, 2013 at 12:20 pm
    Jul 31, 2013 at 2:03 pm
  • I don't think it is possible, but would like to confirm with smart folks out there. Supposing I have a cell storing an integer but in string presentation. For example, here is how I put a value of ...
    Frank LuoFrank Luo
    Jul 18, 2013 at 8:22 pm
    Jul 19, 2013 at 2:53 pm
  • ATT
    Ch huangCh huang
    Jul 13, 2013 at 8:44 am
    Jul 16, 2013 at 3:40 am
  • In 0.94, we already have: public class ColumnAggregationEndpoint extends BaseEndpointCoprocessor implements ColumnAggregationProtocol { @Override public long sum(byte[] family, byte[] qualifier) What ...
    Ted YuTed Yu
    Jul 12, 2013 at 3:56 am
    Jul 12, 2013 at 6:22 pm
  • Hi, From , it appears that Filter.transform() is invoked unconditionally on ...
    Christophe TatonChristophe Taton
    Jul 1, 2013 at 5:10 am
    Jul 2, 2013 at 6:58 am
  • Which release are you using ? If you put the code below in non-endpoint class, would you have the same result ? Cheers
    Ted YuTed Yu
    Jul 20, 2013 at 10:56 pm
    Jul 22, 2013 at 5:09 pm
  • Hi, I know that HBase by default doesn't support table joins like RDBMS.. But anyway, I have a table who value contains a json with a particular ID in it.. This id references another table where it ...
    Pavan SudheendraPavan Sudheendra
    Jul 19, 2013 at 4:24 am
    Jul 22, 2013 at 3:13 am
  • The HBase Team is pleased to announce the immediate release of HBase 0.94.9. Download it from your favorite Apache mirror [1]. As usual, all previous 0.92.x and 0.94.x releases can upgraded to 0.94.9 ...
    Lars hofhanslLars hofhansl
    Jul 4, 2013 at 5:58 pm
    Jul 6, 2013 at 4:09 pm
  • Hi, Like scan with range. I would like to delete rows with range.Is this supported from hbase shell ? Lets say I have a table with keys like A-34335 A-34353535 A-335353232 B-33435 B-4343 C-5353533 I ...
    Rahul BhattacharjeeRahul Bhattacharjee
    Jul 3, 2013 at 5:17 pm
    Jul 4, 2013 at 4:14 pm
  • Hi, I was playing around with using FuzzyRowFilter for my use case which looks like this rk - 18 bytes (2 bytes + 8 bytes + 8 bytes) bytes 2-9 are fuzzy the fuzzy mask looks like this (0, 0, 1, 1, 1, ...
    Premal ShahPremal Shah
    Jul 25, 2013 at 6:14 am
    Apr 5, 2014 at 9:02 am
  • Hi, I hit a weird issue/bug and am able to reproduce the error consistently. The problem arises when FilterList has two filters where each implements the getNextKeyHint method. The way the current ...
    Viral BajariaViral Bajaria
    Jul 29, 2013 at 4:23 am
    Jul 30, 2013 at 12:01 am
  • Hi, I'm trying to split one region in the table ( hbase 0.92.2 ) but getting "ERROR: Unknown table" ... I guess I'm doing something wrong and appreciate and recommendations the region I'm trying to ...
    Alex LevinAlex Levin
    Jul 11, 2013 at 7:17 pm
    Jul 16, 2013 at 1:25 am
  • I have had replication running for about a week now, and have had a lot of data flowing to our slave cluster over that time. Now, I'm running the verifyrep MR job over a 1-hour period a couple days ...
    Patrick SchlessPatrick Schless
    Jul 11, 2013 at 5:24 pm
    Jul 11, 2013 at 9:49 pm
  • Hi, We are using hbase-0.94.1 with hadoop-1.0.2. Recently couple of time we faced a strange issue while deleting a table. Whenever we are deleting a table from HBase shell using disable and drop ...
    Sandeep LSandeep L
    Jul 11, 2013 at 1:08 pm
    Jul 11, 2013 at 4:09 pm
  • We are running HBase version 0.94.6-cdh4.3.0 and I have noticed that quite often while bulk loading HFiles created with a MR job fails with following Exception: 13/06/26 18:28:15 ERROR ...
    Stanislav BartonStanislav Barton
    Jul 5, 2013 at 5:43 pm
    Jul 10, 2013 at 10:05 am
  • Hello, We disabled automated major compactions by setting hbase.hregion.majorcompaction=0. This was to avoid issues during buik import of data since compactions seemed to cause the running imports to ...
    David KochDavid Koch
    Jul 9, 2013 at 11:39 am
    Jul 10, 2013 at 7:20 am
  • Hi folks, We are seeing an issue with hbase 0.94.3 on CDH 4.2.0 with excessive .META. reads... In the steady state where there are no client crashes and there are no region server crashes/region ...
    Varun SharmaVarun Sharma
    Jul 29, 2013 at 5:33 pm
    Aug 1, 2013 at 11:02 pm
  • Hello, I am curious to hear the recommendations people have here for running HBase on EC2 instances. I failed to find an instance that has a good ratio/balance between CPU, # of disks and jvm ...
    Amit MorAmit Mor
    Jul 16, 2013 at 6:18 pm
    Jul 16, 2013 at 7:08 pm
  • Yes this is a known issue. The HDFS part of this was addressed in for 2.0.2-alpha and is not available in 1.x release. I think HBase does not use this ...
    Suresh SrinivasSuresh Srinivas
    Jul 1, 2013 at 10:17 pm
    Jul 2, 2013 at 1:02 am
  • Hello there, I have an Endpoint CP which I deployed by changing the table schema using the 'alter' command in hbase shell. I stored my CP in hdfs. My table has 4 regions, say, region-1 region-2 ...
    Kim ChewKim Chew
    Jul 24, 2013 at 11:57 pm
    Jul 26, 2013 at 6:57 pm
  • Hello, I'm a newbie to Hadoop HBase. I downloaded and installed Hadoop Traning Ubundu Image (Cloudera Distribution for Hadoop). When I tried to create a table and create put instances using java ...
    Zhenzhen YanZhenzhen Yan
    Jul 19, 2013 at 9:29 pm
    Jul 19, 2013 at 10:44 pm
  • Hello all, In order to help understand the intricacies of HBase, I started a small pet project to depict some of the more complicated concepts graphically so as to make them easier to grasp. My ...
    Kulkarni SwarnimKulkarni Swarnim
    Jul 15, 2013 at 1:00 am
    Jul 15, 2013 at 7:15 am
  • Hi , Need to calculate data size in HBase. I can do it by using KV length. But it is time consuming with huge data block. HFile looks better solution but still I have question with HFile, HFile will ...
    Bikash AgrawalBikash Agrawal
    Jul 5, 2013 at 3:55 am
    Jul 14, 2013 at 7:59 pm
  • Hi folks, I just wanted to give a shout out to the Phoenix framework, and specifically for the ability to create "view" against an HBase table whose schema was not being managed by Phoenix. That's a ...
    Doug MeilDoug Meil
    Jul 11, 2013 at 12:17 am
    Jul 12, 2013 at 2:39 am
  • Hi,all If Region process splits, it will make a reference.After executing child region makes a compaction that absorbs all the reference. And I have a question that how to make differences when ...
    Bing JiangBing Jiang
    Jul 10, 2013 at 11:25 am
    Jul 11, 2013 at 1:45 am
  • i upgrade cdh3u4 to cdh4.3,start master node have problem 2013-07-09 15:47:09,061 INFO org.apache.hadoop.hbase.catalog.RootLocationEditor: Unsetting ROOT region location in ZooKeeper 2013-07-09 ...
    Ch huangCh huang
    Jul 10, 2013 at 12:35 am
    Jul 10, 2013 at 1:31 am
  • Hi, all. When I tried to do a manual region split from HBase shell, I found that split command acts incorrectly with hex split keys. For example, I executed hbase(main):003:0 split 'tsdb', ...
    Ding HaifengDing Haifeng
    Jul 3, 2013 at 2:57 pm
    Jul 5, 2013 at 1:29 am
  • Hello Experts, I am quite new to Hbase and Hadoop and above all new to java too. Recently started working on Hbase and Java. I have successfully installed & configured Hadoop & Hbase and also made my ...
    Jul 3, 2013 at 2:57 pm
    Jul 4, 2013 at 4:27 pm
  • Hi, Just wanted to check if it's safe to use the JIRA mentioned in the subject i.e. Thanks, Viral
    Viral BajariaViral Bajaria
    Jul 1, 2013 at 9:52 am
    Jul 3, 2013 at 11:36 am
  • Hi, I'm getting an error on a map reduce task that use to work just fine for a few weeks. Exceeded limits on number of counters - Counters=120 Limit=120 The full stderr output is at the bottom. I'm ...
    Glen ArrowsmithGlen Arrowsmith
    Jul 2, 2013 at 3:07 pm
    Jul 3, 2013 at 6:01 am
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133 users for July 2013

Ted Yu: 99 posts Yuhe: 39 posts Jean-Marc Spaggiari: 34 posts Lars hofhansl: 24 posts Viral Bajaria: 23 posts Azuryy Yu: 20 posts Pavan Sudheendra: 20 posts Asaf Mesika: 18 posts Jean-Daniel Cryans: 16 posts Michel Segel: 15 posts Rohit Kelkar: 13 posts S. Zhou: 13 posts Anoop John: 12 posts Michael Stack: 12 posts Patrick Schless: 12 posts Flavio Pompermaier: 11 posts Pablo Medina: 9 posts Otis Gospodnetic: 8 posts Ramkrishna vasudevan: 8 posts Yonghu: 8 posts
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