Grokbase Groups HBase user June 2013

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116 discussions - 579 posts

  • Hi, How many column families should be there in an hbase table ? Is there any performance issue in read/write if we have more column families ? I have designed one table with around 14 column ...
    Vimal JainVimal Jain
    Jun 28, 2013 at 5:20 am
    Aug 5, 2013 at 2:45 pm
  • Hi All, I wanted some help on understanding what's going on with my current setup. I updated from config to the following settings: <property <name hbase.hregion.max.filesize</name <value ...
    Viral BajariaViral Bajaria
    Jun 27, 2013 at 7:41 am
    Jul 1, 2013 at 6:08 am
  • Hi, I have set up Hbase in pseudo-distributed mode. It was working fine for 6 days , but suddenly today morning both HMaster and Hregion process went down. I checked in logs of both hadoop and ...
    Vimal JainVimal Jain
    Jun 5, 2013 at 6:29 am
    Jun 6, 2013 at 5:41 am
  • Hi, I hope that you can shed some light on these 2 scenarios below. I have 2 small tables of 6000 rows. Table 1 has only 1 column in each of its rows. Table 2 has 40 columns in each of its rows ...
    Tony DeanTony Dean
    Jun 21, 2013 at 9:09 pm
    Oct 19, 2013 at 11:47 am
  • Hi, I have a few small questions regarding HBase. I've searched the forum but couldn't find clear answers hence asking them here: 1. Does Minor compaction remove HFiles in which all entries are out ...
    Pankaj GuptaPankaj Gupta
    Jun 5, 2013 at 2:15 am
    Jun 6, 2013 at 5:39 am
  • Hi Working with the standard filtering mechanism to scan rows that have columns matching certain criterias. There are columns of numeric (integer and decimal) and string types. These columns are ...
    Kristoffer SjögrenKristoffer Sjögren
    Jun 27, 2013 at 6:00 pm
    Jun 29, 2013 at 11:30 am
  • What is the ageOfLastShippedOp as reported on your Master region servers (should be available through the /jmx) - it tells the delay your edits are experiencing before being shipped. If this number ...
    Varun SharmaVarun Sharma
    Jun 20, 2013 at 4:13 pm
    Jun 24, 2013 at 8:29 pm
  • Hi, If I wanted to write to write a unit test against HTable/HBase, is there an already available utility to that for unit testing my application logic. I don't want to write code that either touches ...
    Varun SharmaVarun Sharma
    Jun 18, 2013 at 11:18 pm
    Jun 25, 2013 at 1:05 am
  • The new splitted region might be moved due to load balancing. Aren't you experiencing the classic hot spotting? Only 1 RS getting all write traffic? Just place a preceding byte before the time stamp ...
    Asaf MesikaAsaf Mesika
    Jun 19, 2013 at 8:58 pm
    Jun 21, 2013 at 3:38 pm
  • Hello All, I learn hbase almost from papers and books, according to my understanding, HBase is the kind of architecture which is more appliable to a big cluster. We should have many HDFS nodes, and ...
    Jun 22, 2013 at 2:22 pm
    Jun 23, 2013 at 1:40 pm
  • Dear All, We have production cluster that runs on hbase 0.94.1. The issue we are facing is whenever one regionserver goes down, the cluster becomes unresponsive until all the regions are allocated to ...
    Jun 5, 2013 at 5:21 pm
    Sep 2, 2013 at 11:24 am
  • Here is a problem that I am facing while creating an HFile outside of a MR job. My column family is "sd" For a given rowKey=10011-2-0000000000000000703, this is the sequence in which I am writing ...
    Rohit KelkarRohit Kelkar
    Jun 19, 2013 at 5:06 pm
    Jun 20, 2013 at 11:21 pm
  • Hi, We have heavy map reduce write jobs running against our cluster. Every once in a while, we see a region server going down. We are on : 0.94.2-cdh4.2.0, r We have done some tuning for heavy map ...
    Ameya KantikarAmeya Kantikar
    Jun 5, 2013 at 8:48 pm
    Jun 6, 2013 at 4:34 pm
  • I downloaded the latest stable hbase 0.94.8 and followed the instructions for getting started. However, when I try to run hbase I get the following. /ubuntu:~/dev/hadoop/hbase-0.94.8$ ...
    Jun 3, 2013 at 5:20 pm
    Jun 4, 2013 at 12:01 am
  • Context: I'm working on getting replication set up, and a prerequisite for me is to rename the table (since you have to replicate to the same name as the source). For this, I'm testing a CopyTable ...
    Patrick SchlessPatrick Schless
    Jun 17, 2013 at 7:21 pm
    Jun 21, 2013 at 5:35 am
  • Hi, I'm looking to write a post-put observer coprocessor to maintain a secondary index. Basically, my current rowkey design is a composite of A,B,C and I want to be able to also access data by C. So ...
    Rob mancusoRob mancuso
    Jun 8, 2013 at 5:55 pm
    Jun 18, 2013 at 2:36 am
  • Hi, I don't see any methods returning streams in the Java client HTable : That means we need to use the thrift client to get ...
    Simon MajouSimon Majou
    Jun 1, 2013 at 3:10 pm
    Jun 4, 2013 at 7:28 am
  • Hi, Does anybody can tell me how to configure load balancer to balance just one table. Thank.
    Azuryy YuAzuryy Yu
    Jun 4, 2013 at 1:36 am
    Jun 4, 2013 at 3:31 am
  • Hello, can I return from an EndPoint a generic type? I try to return ArrayList<NameAndDistance from an EndPoint method (where NameAndDistance is a simpe class with two public variables name and ...
    Pavel HančarPavel Hančar
    Jun 10, 2013 at 9:44 am
    Jul 2, 2013 at 9:56 am
  • We want to connect to a non-default / remote hbase server by setting hbase.zookeeper.quorum=our.remote.hbase.server on the command line invocation of "hbase shell" (and not disturbing the existing ...
    Stephen BoeschStephen Boesch
    Jun 24, 2013 at 5:33 am
    Jun 28, 2013 at 11:02 pm
  • Hi, All I am asking the different practices of major and minor compaction... My current understanding is that minor compaction, triggered automatically, usually run along with online query serving ...
    Yun pengYun peng
    Jun 22, 2013 at 12:05 pm
    Jun 22, 2013 at 11:24 pm
  • Hi all, I am curious if it is possible to have a version(0.94.7) deployed on cluster and use 0.94.1 version on client to access it. Thanks in advance!
    Ionut IgnatescuIonut Ignatescu
    Jun 14, 2013 at 6:56 am
    Jun 20, 2013 at 6:07 pm
  • Working on setting up HBase replication across a VPN tunnel, and following the docs here: [1] (and here: [2]). Two questions, regarding firewall allowances required: 1) The docs say that the ...
    Patrick SchlessPatrick Schless
    Jun 17, 2013 at 7:07 pm
    Jun 19, 2013 at 6:05 pm
  • HI, we use CDH 4.2.0, find that some of the regions stop spliting and increase contiusuly under heavy load. some regions become much bigger than the setting value(4G),reaches 46g. any reason or bugs? ...
    Hua beatlsHua beatls
    Jun 15, 2013 at 3:00 pm
    Jun 15, 2013 at 4:58 pm
  • Hi, We are relatively new to Hbase, and we are hitting a roadblock on our scan performance. I searched through the email archives and applied a bunch of the recommendations there, but they did not ...
    Rahul RavindranRahul Ravindran
    Jun 4, 2013 at 6:49 pm
    Jun 5, 2013 at 6:15 am
  • Hi, In a HBASE table, there are 200 columns and the read pattern for diffferent systems invols 70 columns... In the above case, we cannot have 70 columns in the rowkey which will not be a good ...
    Ramasubramanian NarayananRamasubramanian Narayanan
    Jun 4, 2013 at 4:44 pm
    Jun 4, 2013 at 6:48 pm
  • Hi, I have a weird error in a cluster I'm checking Replication with. I have two clusters set up, each on its own DC (different continents). Each has 1 master, and 3 RS. I've done all required setup, ...
    Asaf MesikaAsaf Mesika
    Jun 2, 2013 at 5:21 am
    Jun 3, 2013 at 5:19 am
  • Hi, I am trying to export from hbase to a CSV file. I am using "Scan" class to scan all data in the table. But i am facing some problems while doing it. 1) My table has around 1.5 million rows and ...
    Vimal JainVimal Jain
    Jun 27, 2013 at 7:12 am
    Jun 28, 2013 at 12:45 pm
  • hi,all: i have two search pattern , search for row with specific id ,and search for row with specific token,how can i design schema fit two search pattern effectly?
    Ch huangCh huang
    Jun 28, 2013 at 6:41 am
    Jun 28, 2013 at 10:48 am
  • Hi All, HBase multiget call taking large time and throwing time out exception. I am retrieving only 50 records in one call. The size of each record is 20 KB. 60000 ...
    Ankit JainAnkit Jain
    Jun 25, 2013 at 9:10 am
    Jun 25, 2013 at 4:26 pm
  • Hi Simon, Can you please provide more details? Which version are you testing with, what is the test you are doing, on what kind of computer this is running? Thanks, JM 2013/6/14 Simon Majou <<span ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Jun 14, 2013 at 3:08 pm
    Jun 14, 2013 at 3:48 pm
  • Hi, All HBase could block the online write operations when there are too many data in memstore (to be more efficient for the potential compaction incurred by this flush when there're many files on ...
    Yun pengYun peng
    Jun 9, 2013 at 1:29 pm
    Jun 10, 2013 at 5:47 pm
  • correct error link is
    Alok Singh MahorAlok Singh Mahor
    Jun 8, 2013 at 1:50 pm
    Jun 9, 2013 at 3:53 pm
  • Hi If all the data is already in RS blockcache. Then what's the typical scan latency for scan a few rows from a say several GB table ( with dozens of regions ) on a small cluster with say 4 RS ? A ...
    Liu, RaymondLiu, Raymond
    Jun 3, 2013 at 8:31 am
    Jun 4, 2013 at 11:25 am
  • Using 0.94.6 API Doc, and just remember, just using the API doc with the same major version.
    Azuryy YuAzuryy Yu
    Jun 19, 2013 at 3:18 am
    Jun 19, 2013 at 2:54 pm
  • HBase does not fully support composite keys. But you can use PrefixFilter and FuzzyRowFilter with some limitations if your query involves part of key ...
    Rajeshbabu chintaguntlaRajeshbabu chintaguntla
    Jun 13, 2013 at 10:25 am
    Jun 14, 2013 at 11:00 pm
  • Hi All, I am using hbase(0.94.2) shell to create tables that are using coprocessors. I have added coprocessors to existing tables by using HBaseAdmin api. But, now i need to need to add them while ...
    Anil guptaAnil gupta
    Jun 13, 2013 at 12:01 am
    Jun 13, 2013 at 7:11 am
  • Hi, In the Strata 2013 training lectures, Jonathan Hsieh from Cloudera said something about HBase syncs which I'm trying to understand further. He said that HBase sync guarantees only that a write ...
    Lucas StanleyLucas Stanley
    Jun 11, 2013 at 12:27 am
    Jun 11, 2013 at 7:27 am
  • Hello, I wonder, why spawing an extra process for the different gateways (thrift, stargate, avoc ...), when you can make your app discuss directly with region servers (and zookeeper) ? If your app is ...
    Simon MajouSimon Majou
    Jun 5, 2013 at 1:04 pm
    Jun 10, 2013 at 11:47 pm
  • 1) Metrics infos have been collected from HMaster\RS, and covering rpc, jvm, hbase functional module (like compaction\flush\request Count\DataBlock read &&write etc). 2) You can set metrics info ...
    Bing JiangBing Jiang
    Jun 6, 2013 at 7:42 am
    Jun 6, 2013 at 7:31 pm
  • hi, folks, <hbase 0.94.3 By reading several documents, I always have the impression that * "Replication* works at the table-*column*-*family level*". However, when I am setting up a table with two ...
    N DmN Dm
    Jun 4, 2013 at 10:01 pm
    Jun 5, 2013 at 4:48 pm
  • Hi, Just wanted to make sure if I read in the internet correctly: 0.96 will support HBase RPC compression thus Replication between master and slave will enjoy it as well (important since bandwidth ...
    Asaf MesikaAsaf Mesika
    Jun 4, 2013 at 8:22 am
    Jun 4, 2013 at 11:34 pm
  • Hi all, Currently we are working on a hbase change data capture (CDC) tool. I want to share our ideas and continue development according to your feedback. As you know CDC tools are used for tracking ...
    Yavuz gokirmakYavuz gokirmak
    Jun 3, 2013 at 9:16 am
    Jun 4, 2013 at 6:41 am
  • Howdy, I want to take a look at a MR job which seems to be slower than I had hoped. Mind you, this MR job is only running on a pseudo-distributed VM (cloudera cdh4). I have modified my ...
    David PoissonDavid Poisson
    Jun 27, 2013 at 8:23 pm
    Jul 2, 2013 at 2:04 pm
  • hi all: can hbase start more than one instance ,like mysql, if can ,how to manage these instances? ,thanks a lot
    Ch huangCh huang
    Jun 28, 2013 at 4:36 am
    Jun 28, 2013 at 11:46 pm
  • I think you will need to update your hash function and redistribute data. As far as I know this has been on of the drawbacks of this approach (and the SemaText library) Regards, Shahab
    Shahab YunusShahab Yunus
    Jun 27, 2013 at 1:25 pm
    Jun 28, 2013 at 3:40 am
  • Hi, I created a new table on my cluster today and hit a weird issue which I have not come across before. I wanted to run it by the list and see if anyone has seen this issue before and if not should ...
    Viral BajariaViral Bajaria
    Jun 25, 2013 at 10:23 am
    Jun 27, 2013 at 5:46 am
  • I'm trying to install HBase 0.94.8 just for testing purposes on a single node Hadoop cluster running on a Mac OS X with Hadoop 1.1.2 ( Pig 0.11.1 + Hive 0.11.0 ) I found the following paragraph in ...
    Tecno BrainTecno Brain
    Jun 26, 2013 at 5:03 pm
    Jun 26, 2013 at 10:49 pm
  • I have a usecase where I push data in my HTable in waves followed by Mapper-only processing. Currently once a row is processed in map I immediately mark it as processed=true. For this inside the map ...
    Rohit KelkarRohit Kelkar
    Jun 22, 2013 at 4:43 pm
    Jun 22, 2013 at 7:41 pm
  • hi, i'm running some Hbase MR jobs through the bin/hadoop jar command line. How can i change the log level for those specific execution without changing hbase/conf/ ? I'm my jar there ...
    Joel AlexandreJoel Alexandre
    Jun 21, 2013 at 11:42 pm
    Jun 22, 2013 at 7:10 am
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126 users for June 2013

Ted Yu: 36 posts Jean-Marc Spaggiari: 32 posts Asaf Mesika: 30 posts Azuryy Yu: 27 posts Michael Stack: 24 posts Michel Segel: 24 posts Anoop John: 17 posts Lars hofhansl: 17 posts Vimal Jain: 15 posts Viral Bajaria: 12 posts Yun peng: 12 posts Simon Majou: 11 posts Jean-Daniel Cryans: 10 posts Shahab Yunus: 10 posts Varun Sharma: 10 posts Ramkrishna vasudevan: 9 posts Rohit Kelkar: 9 posts Mohammad Tariq: 8 posts Anil gupta: 7 posts Kevin O'dell: 7 posts
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