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136 discussions - 678 posts

  • Hi, I am currently experimenting with the BigDecimalColumnInterpreter from https://issues.apache.org/jira/browse/HBASE-6669. I was thinking the best way for me to work with it would be to use the ...
    Julian WissmannJulian Wissmann
    Sep 5, 2012 at 4:18 pm
    Oct 3, 2012 at 6:27 pm
  • Hi, I've successfully installed Apache HBase on a cluster with Hadoop. It works fine, but when I try to use Pig to load some data from an HBase table I get this error: ERROR ...
    Alberto CordioliAlberto Cordioli
    Sep 14, 2012 at 1:19 pm
    Sep 29, 2012 at 2:43 am
  • What's in the master's log? J-D On Tue, Sep 18, 2012 at 3:41 AM, Venkateswara Rao Dokku wrote:
    Jean-Daniel CryansJean-Daniel Cryans
    Sep 18, 2012 at 5:13 pm
    Sep 29, 2012 at 9:29 pm
  • Hi everyone, I was curious whether or not I should expect any write hot spots if I structured my composite keys in a way such that the first field is a low cardinality (maybe 30 distinct values) ...
    Eric CzechEric Czech
    Sep 3, 2012 at 5:32 pm
    Sep 7, 2012 at 3:05 am
  • When I try to disable table I get: hbase(main):011:0 disable 'SESSIONID_TIMELINE' ERROR: org.apache.hadoop.hbase.TableNotEnabledException: org.apache.hadoop.hbase.TableNotEnabledException ...
    Mohit AnchliaMohit Anchlia
    Sep 26, 2012 at 8:55 pm
    Sep 28, 2012 at 3:58 am
  • Hello, I am interested in learning the possibility of integrating Lucene & HBase. Google search points me to HBASE-3529 (Add search to HBase). This project is currently listed as "patch available" ...
    Jason HuangJason Huang
    Sep 20, 2012 at 7:39 pm
    Sep 21, 2012 at 4:32 am
  • Hello, A couple of questions regarding balancing of a table's data in HBase. a) What is the easiest way to get an overview of how a table is distributed across regions of a cluster? I guess I could ...
    David KochDavid Koch
    Sep 4, 2012 at 2:56 pm
    Apr 10, 2013 at 4:41 pm
  • Hello, I am trying to set up HBase at pseudo-distributed mode on my Macbook. I was able to installed hadoop and HBase and started the nodes. $JPS 5417 TaskTracker 5083 NameNode 5761 HRegionServer ...
    Jason HuangJason Huang
    Sep 13, 2012 at 10:42 pm
    Sep 19, 2012 at 7:09 pm
  • Hi, What can be used as rowkey to improve performance while loading into hbase? Currently I am having sequence. It takes some 11 odd minutes to load 1 million record with 147 columns. Regards, Rams
    Sep 11, 2012 at 5:40 pm
    Sep 12, 2012 at 7:04 pm
  • We are experiencing a problem where RS are locking up and not processing any requests. Restarting the RS will fix the problem and operations will continue as normal. We are experiencing this issue ...
    Nathaniel CookNathaniel Cook
    Sep 5, 2012 at 9:58 pm
    Sep 6, 2012 at 3:05 pm
  • Hi all, I am doing some experiments on HBase with Coprocessor. I found that the performance of Coprocessor is impacted much by the distribution of the regions. I am kind of interested in going deep ...
    Dan HanDan Han
    Sep 26, 2012 at 12:26 am
    Sep 28, 2012 at 4:22 am
  • Hi all -- we're currently on cdh3u3 (0.90.4 + patches). I have one table in our cluster which seems to functioning fine (gets/puts/scans are all working), but for which no regions are listed on the ...
    Norbert BurgerNorbert Burger
    Sep 10, 2012 at 3:34 pm
    Sep 11, 2012 at 3:38 pm
  • Hi, I am running hbase-0.92.1 and have set up a cluster of 10 machines. Scans performance seems great, 30K-100K rows per second, but random row reads are only about 100 rows/second. My rows are not ...
    Jonathan BishopJonathan Bishop
    Sep 26, 2012 at 6:05 am
    Sep 26, 2012 at 8:13 pm
  • Hi, Can we create rowkey with multiple columns? If so can u please share the syntax of doing the same for the below scenario. Table Name : TXNTABLE Columns : 1) Branch 2) Account Number 3) Txn Date ...
    Ramasubramanian NarayananRamasubramanian Narayanan
    Sep 22, 2012 at 2:45 pm
    Sep 26, 2012 at 7:10 am
  • Hello All, I am using hbase 0.92.1 on hadoop 1 . I am getting those exceptions, and it seems to me that it means that the hbase file is not sorted in order. So when the scanner goes through it, it ...
    Mohamed IbrahimMohamed Ibrahim
    Sep 16, 2012 at 10:01 pm
    Sep 24, 2012 at 3:04 pm
  • Hi, I install CDH4.0 with RPM package, but I cannot find the hbase-default.xml file? Where can I find it? Best R. Huaxiang
    Sep 8, 2012 at 4:48 am
    Sep 11, 2012 at 9:33 am
  • Hello, I would be grateful if someone could shed a light to the following: Each M/R map task is reading data from a separate region of a table. From the jobtracker 's GUI, at the map completion ...
    Ioakim PerrosIoakim Perros
    Sep 4, 2012 at 3:17 pm
    Sep 4, 2012 at 7:13 pm
  • Hi , I want to run query like select month(eventdate),scene,count(1),sum(timespent) from eventlog group by month(eventdate),scene in hbase.Through hive its taking a lot of time for 40 million ...
    Iwannaplay gamesIwannaplay games
    Sep 10, 2012 at 2:03 pm
    Sep 13, 2012 at 7:13 pm
  • Hi, We recently upgraded hbase 0.90.4 to HBase 0.92. Our HBase app worked fine in hbase 0.90.4. Our new setup has HBase 0.92 server and hbase 0.90.4 client. And throw following exception when client ...
    Agarwal, SaurabhAgarwal, Saurabh
    Sep 25, 2012 at 6:18 pm
    Sep 28, 2012 at 11:21 am
  • Hi, And the servers are identical in terms of hardware, JVM, etc.? What does your monitoring tool show is different on problematic machines, other than the load? How's JVM heap and GC looking? Have a ...
    Otis GospodneticOtis Gospodnetic
    Sep 26, 2012 at 3:51 am
    Sep 26, 2012 at 9:56 pm
  • Yet another time series questions. I have an issue where my row key will be the same but I will have multiple versions of the data. I dont need only the last one instead I need all X number of ...
    Sep 20, 2012 at 1:09 am
    Sep 21, 2012 at 12:51 am
  • Hi, I was doing some load testing on my cluster. I am writing to HBase (version 0.92.0) from 20 threads simultaneously. After running the program for some time, one of my machines got unresponsive. I ...
    Amlan RoyAmlan Roy
    Sep 12, 2012 at 3:09 pm
    Sep 13, 2012 at 9:11 am
  • I am facing this exception while iterating over a big table, by default i have specified caching as 100, i am getting the below exception, even though i checked there are several calls made to the ...
    Dhirendra SinghDhirendra Singh
    Sep 10, 2012 at 5:14 pm
    Sep 12, 2012 at 5:39 am
  • Hey Mohit, See http://hbase.apache.org/book.html#schema.smackdown.rowscols -- Harsh J
    Harsh JHarsh J
    Sep 10, 2012 at 5:31 pm
    Sep 11, 2012 at 12:58 pm
  • Hello guys, I am reading the book "HBase, the definitive guide", at the beginning of chapter 3, it is mentioned in order to reduce performance impact for clients to update the same row (lock ...
    Lin MaLin Ma
    Sep 2, 2012 at 9:14 am
    Sep 7, 2012 at 3:40 pm
  • Hi there, Using Hbase as a realtime storage(7*24h), how to reduce the influence of region auto-splitting? Any advice will be appreciated! Thanks, Jing
    Jing wangJing wang
    Sep 5, 2012 at 10:18 am
    Sep 6, 2012 at 6:16 am
  • Hi, I have a user case to "filter" out rows using an "as of" predicate. For example, given a specific time point T, I would like to find all rows where start_time<=T<=end_time. Example hbase table ...
    Shumin WuShumin Wu
    Sep 17, 2012 at 4:28 pm
    Oct 11, 2012 at 5:39 pm
  • Dear All, I am using HBASE 0.94.1 with Hadoop 0.23.1. I have written a multi-threaded thrift client to load the data into HBASE using BatchMutations. The size of each batch is 1000 rows and the table ...
    Pankaj MisraPankaj Misra
    Sep 25, 2012 at 6:16 am
    Sep 25, 2012 at 11:10 am
  • I'm running Nutch 2 using HBase as my backend in local mode. Everything seems to be working correctly except when I run the readdb method. When I run readdb, I get the following stack trace ...
    Bai ShenBai Shen
    Sep 19, 2012 at 2:27 pm
    Sep 24, 2012 at 4:14 pm
  • Dear all, Sorry to send the email multiple times! An error in the previous email is corrected. I am not exactly sure if it is correct and required to keep consistency as follows when saving and ...
    Bing LiBing Li
    Sep 20, 2012 at 2:02 am
    Sep 20, 2012 at 3:24 am
  • Hi all, I'm trying to find the sweet spot for the cache size and batch size Scan() parameters. I'm scanning one table using HTable.getScanner() and iterating over the ResultScanner retrieved. I did ...
    Amit SelaAmit Sela
    Sep 12, 2012 at 12:58 pm
    Sep 17, 2012 at 5:11 pm
  • Hi, Getting this error while using hbase as a sink. Error java.io.IOException: Pass a Delete or a Put at ...
    Jothikumar EkanathJothikumar Ekanath
    Sep 11, 2012 at 2:06 am
    Sep 12, 2012 at 7:28 pm
  • The reason was than i am getting a exception like http://pastebin.com/PmFrmPNy when i exec the coprocessor. ./Zahoor
    J Mohamed ZahoorJ Mohamed Zahoor
    Sep 22, 2012 at 8:09 am
    Oct 2, 2012 at 6:13 am
  • Hi, I wanted to Cluster Hbase on 2 nodes. I put one of my nodes as hadoop-namenodeas well as hbase-master & the other node as hadoop-datanode1 as well as hbase-region-server1. I started hadoop ...
    Venkateswara Rao DokkuVenkateswara Rao Dokku
    Sep 26, 2012 at 7:20 am
    Sep 26, 2012 at 8:30 am
  • Hi, My hbase was working properly.But now it shows two instances of hregionserver , the starting time of one is of 4 days back.If i try stopping hbase it doesnt stop by stop-hbase.sh.If i go to slave ...
    Iwannaplay gamesIwannaplay games
    Sep 25, 2012 at 5:59 am
    Sep 25, 2012 at 5:52 pm
  • Hello, We're having a problem when calling HBaseAdmin.split() on an empty region. The new regions are never getting created and the RegionServer appears to be throwing an IllegalArgumentException ...
    John EdstromJohn Edstrom
    Sep 20, 2012 at 5:39 pm
    Sep 21, 2012 at 11:39 am
  • I am using client 0.90.5 jar Is there a way to limit how many rows can be fetched in one scan call? Similarly is there something for colums?
    Mohit AnchliaMohit Anchlia
    Sep 12, 2012 at 10:51 pm
    Sep 13, 2012 at 12:00 am
  • Hi, We have our system setup such that all interaction is done through co-processors. We update the database via a co-processor (it has the appropriate logic for dealing with concurrent access to ...
    Tom BrownTom Brown
    Sep 10, 2012 at 5:33 pm
    Sep 12, 2012 at 6:07 pm
  • Hello, We are developing a web-application that uses HBase as database, with Tomcat as application server. Currently, our server-side code can act as a sort of NoSQL abstraction-layer for either ...
    Jeroen HoekJeroen Hoek
    Sep 7, 2012 at 7:58 am
    Sep 12, 2012 at 9:57 am
  • I'm new to HBase and HDFS and have a question about what happens when failure is detected and a new region server takes over a region. If the old region server hasn't really failed and "comes back" ...
    Nick PuzNick Puz
    Sep 7, 2012 at 7:19 pm
    Sep 7, 2012 at 8:04 pm
  • Hello I just wanna know why hbase doesn't provide Encryption ? Tnx
    Farrokh ShahriariFarrokh Shahriari
    Sep 5, 2012 at 4:53 am
    Sep 6, 2012 at 7:50 pm
  • Hello, I am exploring HBase & Lily and I have a few starter questions hoping to get some help from users in this group who had tried that before: (1) Do I need to post all the HBase table contents to ...
    Jason HuangJason Huang
    Sep 27, 2012 at 8:58 pm
    Sep 28, 2012 at 1:23 pm
  • Dear All, I have created 2 clients with multi-threading support to perform concurrent writes to HBase with initial expectation that with multiple threads I should be able to write faster. The clients ...
    Pankaj MisraPankaj Misra
    Sep 19, 2012 at 6:53 pm
    Sep 19, 2012 at 9:02 pm
  • Hi HBase Community: I wonder if it is possible to undelete the rows that have been marked for deletion before the major compaction kicks in? I read about HBASE-4536 but I'm not sure if this can ...
    Jerry LamJerry Lam
    Sep 18, 2012 at 10:07 pm
    Sep 19, 2012 at 2:32 pm
  • Hi, I found an interesting difference between hbase scan query. I have a hbase table which has a lot of columns in a single column family. eg. let's say I have a users table, then userid, username, ...
    Shengjie MinShengjie Min
    Sep 13, 2012 at 2:13 pm
    Sep 17, 2012 at 5:21 pm
  • I am debating if a lookup table would help my situation. I have a bunch of codes which map with timestamp (unsigned int). The codes look like this AA4 AAA5 A21 A4 ... Z435 The size range from 1 ...
    Sep 15, 2012 at 3:09 pm
    Sep 17, 2012 at 4:23 pm
  • The folks at wizecommerce have kindly offered to host a meetup down in San Mateo on the evening of 10/29. Are you all up for a user meetup at the end of October after Hadoop World? If so, I'll stick ...
    Michael StackMichael Stack
    Sep 13, 2012 at 5:44 pm
    Sep 15, 2012 at 12:01 am
  • Your HBase team are pleased to announce the release of HBase 0.92.2. Download it from your favorite Apache mirror [1]. I am trying to push the artifacts to maven repo. HBase 0.92.2 is a bug fix ...
    Ted YuTed Yu
    Sep 13, 2012 at 6:44 pm
    Sep 14, 2012 at 11:38 pm
  • When I query HBase, I always include a time range. This has not been a problem when querying recent data, but it seems to be an issue when I query older data (a few hours old). All of my row keys ...
    Tom BrownTom Brown
    Sep 12, 2012 at 9:52 pm
    Sep 13, 2012 at 4:45 am
  • WAL is just there for recover. Reads will meet the Memstore on their read path, that's how LSM Trees are working. -- Adrien Mogenet http://www.mogenet.me
    Adrien MogenetAdrien Mogenet
    Sep 12, 2012 at 9:20 pm
    Sep 12, 2012 at 9:36 pm
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136 users for September 2012

Michael Stack: 46 posts Doug Meil: 23 posts Ramkrishna.S.Vasudevan: 20 posts Jason Huang: 19 posts Ted Yu: 19 posts Lars hofhansl: 17 posts Anil Gupta: 16 posts Harsh J: 16 posts Venkateswara Rao Dokku: 16 posts Julian Wissmann: 15 posts Ramasubramanian Narayanan: 15 posts Jean-Daniel Cryans: 14 posts Mohit Anchlia: 14 posts Michel Segel: 13 posts Andrew Purtell: 12 posts N keywal: 12 posts Xiang Hua: 11 posts Anoop Sam John: 10 posts Eric Czech: 10 posts Mohammad Tariq: 10 posts
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