Grokbase Groups HBase user July 2012
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158 discussions - 803 posts

  • Hello there, I designed a row key for queries that need best performance (~100 ms) which looks like this: userId-date-sessionId These queries(scans) are always based on a userId and sometimes ...
    Christian SchäferChristian Schäfer
    Jul 31, 2012 at 3:28 pm
    Aug 24, 2012 at 7:54 am
  • I added new regions and the performance didn't improve. I think it still is the load balancing issue. I want to ensure that my rows are getting distrbuted accross cluster. What I see is this: Could ...
    Mohit AnchliaMohit Anchlia
    Jul 26, 2012 at 10:32 pm
    Jul 30, 2012 at 7:38 pm
  • Can a regionserver and quorumpeer reside on the same node?
    Jay WilsonJay Wilson
    Jul 1, 2012 at 9:06 pm
    Jul 3, 2012 at 1:14 am
  • Hi, For development purpose, I have set up HBase in pseudodistributed mode. I have following line in hbase-env.sh file export HBASE_MANAGES_ZK=true HBase shell works fine. But client API is not ...
    AnandaVelMurugan Chandra MohanAnandaVelMurugan Chandra Mohan
    Jul 3, 2012 at 10:20 am
    Jul 3, 2012 at 3:08 pm
  • HI ALL My HBase group a total of 3 machine, Hadoop HBase mounted in the same machine, zookeeper using HBase own. Operation 3 months after the reported abnormal as follows. Cause hmaster and ...
    LztaominLztaomin
    Jul 2, 2012 at 8:57 am
    Jul 16, 2012 at 10:55 pm
  • Through the master and regionserver log,I find load balancer repeatedly close and open region in the same regionserver(period in hbase.balancer.period ). Does this is a bug in load balancer and how ...
    HowardHoward
    Jul 17, 2012 at 12:09 pm
    Jul 30, 2012 at 10:26 am
  • Hi, I am using Hbase to store data about mechanical components. Each component has model no. and serial no. and some other attributes. I would be querying my data mostly by model no. and serial no ...
    AnandaVelMurugan Chandra MohanAnandaVelMurugan Chandra Mohan
    Jul 16, 2012 at 5:31 am
    Jul 20, 2012 at 1:42 am
  • Hey all, I'm running hbase 0.90.4, and somehow the regions for one of my tables have become unlinked from the table itself. The Master UI shows no regions for the table, and attempting to call ...
    Bryan BeaudreaultBryan Beaudreault
    Jul 2, 2012 at 2:35 pm
    Jul 9, 2012 at 7:38 pm
  • Hi, Please see http://wiki.apache.org/hadoop/Hbase/PoweredBy Everyone on this list, kindly consider verifying that your entry on the Powered By page is current. For those who are users of HBase but ...
    Lars GeorgeLars George
    Jul 2, 2012 at 10:11 am
    Jul 3, 2012 at 12:16 pm
  • HTable is not thread safe[1]. It's better to use HTablePool if you want to share things across multiple threads.[2] 1 http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html 2 ...
    Elliott ClarkElliott Clark
    Jul 23, 2012 at 10:55 pm
    Jul 25, 2012 at 12:43 am
  • Hi, I can nolonger start my cluster correctly and get messages like http://pastebin.com/T56wrJxE (taken on one region server) I suppose Hbase is not done for being stopped but only for having some ...
    Cyril ScetbonCyril Scetbon
    Jul 5, 2012 at 7:45 am
    Jul 10, 2012 at 10:00 am
  • Hey guys, in my application the HBase timestamp is used as version in my logic. I would like to know what is the best way to insert a new record and get its timestamp. I have come up with two ...
    Pablo MusaPablo Musa
    Jul 30, 2012 at 10:12 pm
    Nov 14, 2012 at 12:12 am
  • Is there an easy way to tell how my nodes are balanced and how the rows are distributed in the cluster?
    Mohit AnchliaMohit Anchlia
    Jul 25, 2012 at 5:32 am
    Jul 26, 2012 at 8:32 pm
  • I don't believe that there has been any reports of collisions, but if. You are concerned you could use the SHA-1 for generating the hash. Relatively speaking, SHA-1is slower, but still fast enough ...
    Michel SegelMichel Segel
    Jul 20, 2012 at 7:17 pm
    Jul 23, 2012 at 6:39 pm
  • Hi, Looking into hbase security, it appears that when HBaseRPC is creating a proxy (e.g., SecureRpcEngine), it injects the current user: User.getCurrent() which by default is the cached Kerberos TGT ...
    Tony DeanTony Dean
    Jul 11, 2012 at 5:41 pm
    Jul 12, 2012 at 9:14 pm
  • Hello, I already found some old entries from mailinglists and articles at Cloudera how to use the Snappy library from Hadoop in HBase, but it does not seem to work for me. I installed Hadoop and ...
    Arvid WarneckeArvid Warnecke
    Jul 8, 2012 at 7:46 am
    Jul 11, 2012 at 6:08 pm
  • ________________________________ Hi All, I am new to hadoop and hbase, and running Hadoop over single node cluster so as Hbase also, I have used command start-hbase.sh it only starts Hmaster no other ...
    Yogesh Kumar13Yogesh Kumar13
    Jul 10, 2012 at 7:07 am
    Jul 10, 2012 at 9:52 am
  • Hi, I'm testing AggregationClient functions to check if we could use coprocessors for mathematical functions. The code I use is the following : package coreprocessor; import ...
    Cyril ScetbonCyril Scetbon
    Jul 29, 2012 at 9:50 pm
    Jul 30, 2012 at 9:16 pm
  • Is it possible to enable compression on the table on a already existing table?
    Mohit AnchliaMohit Anchlia
    Jul 24, 2012 at 8:29 pm
    Jul 25, 2012 at 4:43 am
  • Hi there I am getting an UnknownRowLockException when adding locks to the increment() function below. The full stack trace is at the end of this message. There are a few other places I am acquiring ...
    Marco GallottaMarco Gallotta
    Jul 24, 2012 at 9:54 pm
    Jul 24, 2012 at 10:58 pm
  • Hi, I have technical problem, and wander whether HBase or Cassandra support Embedded table data model, or can somebody show me a way to do this: 1.We have a very large customer entity table which ...
    Xiaobo GuXiaobo Gu
    Jul 12, 2012 at 3:58 am
    Jul 13, 2012 at 2:55 pm
  • Hi, My organization has been doing something zany to simulate atomic row operations is HBase. We have a converter-object model for the writables that are populated in an HBase table, and one of the ...
    Keith WyssKeith Wyss
    Jul 5, 2012 at 6:19 pm
    Jul 10, 2012 at 11:58 am
  • Hi, I have a question regarding the best way to design a table. Let's imagine I want to store all the people in the world on a database. Everyone has a name, last name, phone number, lot of flags ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Jul 2, 2012 at 7:05 pm
    Jul 3, 2012 at 2:03 pm
  • I am trying to drop one of the tables but on the shell I get run major_compact. I have couple of questions: 1. How to see if this table has more than one region? 2. And why do I need to run major ...
    Mohit AnchliaMohit Anchlia
    Jul 23, 2012 at 8:09 pm
    Jul 23, 2012 at 8:48 pm
  • Hi, When we try to add a value to a CF which does not exist on a table, we are getting the error below. I think this is not really giving the right information about the issue. Should it not be ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Jul 9, 2012 at 12:26 pm
    Jul 10, 2012 at 10:21 pm
  • Hello: We've been doing some failure scenario tests by powering down a .META. holding region server host and while the HBase cluster itself recovers and reassigns the META region and other regions ...
    Suraj VarmaSuraj Varma
    Jul 3, 2012 at 12:36 am
    Jul 10, 2012 at 5:28 pm
  • Hi HBase guru: I need some advises on a problem that I'm facing using HBase. How can I efficiently query a version of a column when I don't know exactly the version I'm looking for? For instance, I ...
    Jerry LamJerry Lam
    Jul 26, 2012 at 5:44 pm
    Aug 1, 2012 at 9:42 pm
  • Yes, if you are generating HFiles on one cluster and loading into a separate hbase cluster. If they are co-located, its just a hdfs mv. Another problem is with data locality immediately after bulk ...
    Sateesh LakkarsuSateesh Lakkarsu
    Jul 26, 2012 at 4:47 pm
    Jul 27, 2012 at 2:02 pm
  • Hi, I'm using endpoint coprocessors to do intense scans in parallel on some tables. I log the time it takes for each coprocessor to finish its job on the region. Each coprocessor rarely takes longer ...
    KevinKevin
    Jul 19, 2012 at 7:44 pm
    Jul 20, 2012 at 3:29 pm
  • Hi there, I read some good practices about number of columns / column families, but nothing about the number of tables. What if I need to spread my data among hundred or thousand (big) tables ? What ...
    Adrien MogenetAdrien Mogenet
    Jul 13, 2012 at 7:05 am
    Jul 14, 2012 at 6:27 am
  • Hello, I wonder, for purging old data, if I'm OK with "remove all StoreFiles which are older than ..." way, can I do that? To me it seems like this can be a very effective way to remove old data, ...
    Alex BaranauAlex Baranau
    Jul 9, 2012 at 7:36 pm
    Jul 11, 2012 at 2:10 pm
  • Finally my HMaster has stabilized and been running for 7 hours. I believe my networking issues are behind me now. Thank you everyone for the help. New issue is my RSes continue to die after about 20 ...
    Jay WilsonJay Wilson
    Jul 6, 2012 at 3:26 am
    Jul 6, 2012 at 3:32 pm
  • I'm currently running thrift on all region server nodes. The reasoning is that you can run jobs on this cluster and these jobs, when using thrift, can connect to localhost. The drawback is that I'm ...
    EricEric
    Jul 31, 2012 at 11:33 am
    Aug 2, 2012 at 5:56 am
  • Which protocol is better supported? Protocol Buffer, Thrift, Avro? I'm particularly interested in knowing which protocol(s) support the checkAndPut api. Thanks.
    Trung PhamTrung Pham
    Jul 29, 2012 at 7:40 am
    Jul 30, 2012 at 3:34 am
  • Now that I have a stable cluster, I would like to use YCSB to test its performance; however, I am a bit confused after reading several different website posting about YCSB. 1) Be default will YCSB ...
    RegistrationRegistration
    Jul 9, 2012 at 7:18 pm
    Jul 10, 2012 at 10:36 pm
  • Is it advisable to enable bloom filters on the column family? Also, why is it called global kill switch? Bloom Filter Configuration 2.9.1. io.hfile.bloom.enabled global kill switch ...
    Mohit AnchliaMohit Anchlia
    Jul 26, 2012 at 8:30 pm
    Jul 27, 2012 at 11:10 pm
  • Hello, I am learning about coprocessors and would like to know more about how to choose between coprocessors and MapReduce. First, I thought coprocessors needed a restart but it seems a shell can be ...
    Bertrand DechouxBertrand Dechoux
    Jul 24, 2012 at 3:00 pm
    Jul 26, 2012 at 1:28 pm
  • Hello - I'm using HBase for web server log processing and I'm trying to save the top N urls per category per day in a sorted manner in HBase. From what I've read, the only sortable structure that ...
    Hari PrasannaHari Prasanna
    Jul 24, 2012 at 1:51 pm
    Jul 24, 2012 at 3:22 pm
  • Hi, Is there any efficient way (beyond the trivial using TableMapReduceUtil / TableOutputFormat) to perform faster read and write operations to tables ? Could anyone provide some example code of it ? ...
    Ioakim PerrosIoakim Perros
    Jul 23, 2012 at 12:46 am
    Jul 24, 2012 at 2:09 am
  • Hi, We got a Map/Reduce job that threw NotServingRegionException when the reducer was about to insert data into a Hbase table. The error message is as follows. I also copied the corresponding region ...
    Ey-Chih chowEy-Chih chow
    Jul 23, 2012 at 7:39 pm
    Jul 23, 2012 at 11:35 pm
  • Hi, Is it feasible to do disk or tape backup for Hbase tables? I have read about the tools like Export, CopyTable, Distcp. It seems like they will require a separate HDFS cluster to do that. Regards, ...
    Amlan RoyAmlan Roy
    Jul 23, 2012 at 12:52 pm
    Jul 23, 2012 at 11:02 pm
  • I put some comments up on the JIRA Mohammed. Thanks for helping out on the refguide. St.Ack
    Michael StackMichael Stack
    Jul 19, 2012 at 10:53 pm
    Jul 22, 2012 at 9:26 pm
  • Hello, When scanning a table with 2 column families, is it possible to apply a QualifierFilter selectively to one family but still include the other family in the scan? The layout of my table is as ...
    David KochDavid Koch
    Jul 18, 2012 at 10:06 pm
    Jul 20, 2012 at 9:28 am
  • Hi, For a few days now I'm fighting with a very strange behaviour of Hbase. I hope you can explain it to me. In short: add rows with version, delete all rows, add the same rows again, old rows ...
    Zoltán Tóth-CzifraZoltán Tóth-Czifra
    Jul 18, 2012 at 5:20 pm
    Jul 19, 2012 at 10:23 am
  • Hi Alex Here we worked with bulk import creating the HFiles in a MR job and we finish the load calling doBulkLoad method of LoadIncrementalHFiles class (probably the same method used by ...
    Cristofer WeberCristofer Weber
    Jul 18, 2012 at 5:28 pm
    Jul 19, 2012 at 2:55 am
  • Hi, I'm not 100% sure but I think getScanner return a result scanner and not the result itself. What you need to do is something like ResultScanner scanner = table_work_proposed.getScanner(scan) ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Jul 17, 2012 at 3:42 pm
    Jul 17, 2012 at 6:06 pm
  • Quick question about data node hadrware. I've read a few articles, which cover the basics, including the Cloudera's recommendations here ...
    Bartosz M. FrakBartosz M. Frak
    Jul 12, 2012 at 7:57 pm
    Jul 12, 2012 at 11:23 pm
  • Hi, We've been tinkering around ideas of implementing secondary index. One of the ideas is based on concatenating three meaningful fields into a long: int, short (2 bytes), short. This long will be ...
    Asaf MesikaAsaf Mesika
    Jul 9, 2012 at 1:19 pm
    Jul 10, 2012 at 8:03 am
  • Hey, I have been getting the following in thrift logs. 2012-07-04 15:41:05,903 WARN org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation: Encountered problems when prefetch ...
    Jay WhittakerJay Whittaker
    Jul 4, 2012 at 3:39 pm
    Jul 6, 2012 at 4:47 pm
  • Hi, Yesterday I stopped my cluster because of a storm. It did not went up well so I have formated the hadoop FS and restarted it. Now, when I'm trying to re-create my schema, I'm facing some issues ...
    Jean-Marc SpaggiariJean-Marc Spaggiari
    Jul 5, 2012 at 11:06 am
    Jul 5, 2012 at 8:49 pm
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websitehbase.apache.org

168 users for July 2012

Mohit Anchlia: 39 posts Mohammad Tariq: 31 posts Michael Stack: 30 posts Alex Baranau: 28 posts Michel Segel: 27 posts Jean-Daniel Cryans: 25 posts Suraj Varma: 24 posts Ted Yu: 21 posts Amandeep Khurana: 20 posts Jean-Marc Spaggiari: 20 posts Asaf Mesika: 19 posts Syed kather: 18 posts AnandaVelMurugan Chandra Mohan: 17 posts Jay Wilson: 16 posts Sever Fundatureanu: 16 posts Cyril Scetbon: 13 posts Tony Dean: 12 posts Bryan Beaudreault: 11 posts Cristofer Weber: 11 posts Deanforwever2010: 11 posts
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