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146 discussions - 756 posts

  • Someone with better knowledge than might be interested in helping answer this question over at StackOverflow: http://stackoverflow.com/questions/7237271/large-scale-data-processing-hbase-cassandra ...
    Chris TarnasChris Tarnas
    Aug 30, 2011 at 6:03 am
    Sep 5, 2011 at 10:07 pm
  • Given the hardy reviews and timing, we recently shifted from 90.3 (apache) to 90.4rc2 (the July 24th one that Stack posted -- 0.90.4, r1150278). We had a network switch go down last night which ...
    Aug 2, 2011 at 10:44 pm
    Aug 5, 2011 at 6:57 pm
  • Dear HBase users, I think this was brought up previously on the list, but I couldn't dig up the thread, so starting a new one. Hadoop World 2011 (http://hadoopworld.com/) will be held November 8th ...
    Todd LipconTodd Lipcon
    Aug 26, 2011 at 10:33 pm
    Sep 13, 2011 at 4:37 pm
  • Hi Guys I changed the endkey of one of the records in the '.META.' table because of the chaining issue we experienced , using the program which gets that row and does a put so that the endkey could ...
    Rohit NigamRohit Nigam
    Aug 16, 2011 at 12:53 am
    Aug 24, 2011 at 4:41 am
  • Hi, We are experiencing an issue in our HBase Cluster wherein some of the gets are timing outs at: java.io.IOException: Giving up trying to get region server: thread is interrupted. at ...
    Srikanth P. ShreenivasSrikanth P. Shreenivas
    Aug 18, 2011 at 2:38 pm
    Aug 22, 2011 at 1:58 pm
  • I don't quite remember where but I think I remember hearing that you should only have a handful of column families (1-4) per table. Is this true and if so, why? Thanks
    Aug 14, 2011 at 12:18 am
    Aug 17, 2011 at 4:00 am
  • Hey - I've got a corrupt HDFS block in a region server's ".logs" directory. Also, "hbase hbck" reports 5 inconsistencies. .META. shows a region as offline, and it won't come online. What are my ...
    Geoff HendreyGeoff Hendrey
    Aug 6, 2011 at 7:12 pm
    Aug 13, 2011 at 11:10 pm
  • Hello, I am trying to solve a time related problem. I can certainly use opentsdb for this but was wondering if anyone had a clever way to create this type of schema. I have an inventory table, time ...
    Aug 25, 2011 at 2:03 pm
    Aug 29, 2011 at 2:45 am
  • Hi , Our environment hbase 90.2 (10 machine) We have 10 machine grid: master has 48G ram slaves machine has 16G ram. Region Server process has 4G ram Zookeeper process has 2G ram We have ...
    Oleg RuchovetsOleg Ruchovets
    Aug 23, 2011 at 9:37 am
    Jul 24, 2013 at 3:53 pm
  • We are attempting to build what is akin to a CRM (but not). Our backend is an interface in which clients can control the variables of their assets offering; the variables of the template they use act ...
    Aug 30, 2011 at 6:30 am
    Aug 30, 2011 at 12:43 pm
  • Why when scanning do I see the following sort order? "foo bar" "foo bar" "foo" I thought that "foo" would be sorted before "foo bar" since this is natural ordering. Why am I seeing these results?
    Aug 22, 2011 at 1:48 am
    Aug 23, 2011 at 2:23 am
  • Hi All, Can anyone confirm that, when a multi threaded application, say with 10 threads, try to get 10 different keys from 10 different regions spread over 10 nodes yield 1/10th of the total time ...
    Jimson K. JamesJimson K. James
    Aug 23, 2011 at 4:05 am
    Aug 24, 2011 at 6:44 pm
  • Hi all, I would like to know why MongoDB is faster than HBase to select items. I explain my case : I've inserted 4'000'000 lines into HBase and MongoDB and i must calculate the geolocation with the ...
    Laurent HatierLaurent Hatier
    Aug 10, 2011 at 5:02 pm
    Aug 11, 2011 at 1:53 pm
  • Hi all, Right now I have a java client program that accesses Hbase in multiple threads for read / write. Each thread creates its own instance of HTable of the _same_ table. I am looking into ...
    Sujee ManiyamSujee Maniyam
    Aug 23, 2011 at 11:35 pm
    Aug 26, 2011 at 2:50 pm
  • Hi, We are running cdh3u0 hbase/hadoop suites on 28 nodes. From last Friday, we got three regionservers have opened fd and CLOSE_WAIT kept increasing. It looks like if the lines like ==== 2011-08-22 ...
    Xu-Feng MaoXu-Feng Mao
    Aug 22, 2011 at 10:34 am
    Aug 23, 2011 at 5:48 am
  • I understand the need but I don't understand how to generate a reverse timestamp. Can someone please explain how this is accomplished and how I can test that its working correctly? Thanks
    Aug 20, 2011 at 1:40 am
    Aug 20, 2011 at 4:55 pm
  • Here's another coprocessor question... Currently there is no way (that I can find) to make use of those batches in coprocessors. This is an issue when, for example, sets of puts and gets are ...
    Lars hofhanslLars hofhansl
    Aug 11, 2011 at 5:47 am
    Aug 17, 2011 at 4:06 am
  • our table inconsistency is due to an orphaned row in .META. What do I mean startkey endkey =========== A B B C C X D E Notice that endkey "X" doesn't exist anywhere as a startkey. I want to fix this ...
    Geoff HendreyGeoff Hendrey
    Aug 13, 2011 at 12:38 am
    Aug 13, 2011 at 4:49 am
  • Hi, I am relatively new to HBase and I am trying to find the path that is followed (i.e. the lines executed in the source code) in a query, say "select *" . Can anyone help me in this regard. Thanks
    Anurag AwasthiAnurag Awasthi
    Aug 11, 2011 at 10:11 am
    Aug 11, 2011 at 6:44 pm
  • Is HBase 0.90.4 compatible with Hadoop 0.20.203 ? Thank you Sent from my iPhone
    Wei Shung ChungWei Shung Chung
    Aug 31, 2011 at 3:40 pm
    Aug 31, 2011 at 7:20 pm
  • hi! I need to free hdd space, so I want to delete some unimportant rows I'm using Thrift call deleteAllRow(TABLE, ROWID); to perform deletion of about 10 000 row (when I loaded them it was about ...
    Aug 25, 2011 at 7:18 am
    Aug 26, 2011 at 4:59 pm
  • Can someone please tell me why when Im developing locally I can never access my cluster again after my ip changes... ie I take my laptop from work home. I always have to blow away my /var/hbase ...
    Aug 26, 2011 at 5:17 am
    Aug 26, 2011 at 4:54 pm
  • We are logging all user actions into hbase. These actions include searches, product views and clicks. We are currently storing them in one table with row keys like so: "#{type}/#{user}/#{time}", ...
    Aug 21, 2011 at 3:59 pm
    Aug 26, 2011 at 3:40 pm
  • Hi All, I am running the HBase distributed mode in seven node cluster with backup master. The HBase is running properly in the backup master environment. I want to run this HBase on top of the High ...
    Aug 11, 2011 at 6:20 pm
    Aug 20, 2011 at 5:53 am
  • Hi , I want to try copy table and export/import utility of Hbase for data backup. I am using Hadoop 0.20.2 and Hbase 0.90.3 I was trying to apply the patch given at ...
    Stuti AwasthiStuti Awasthi
    Aug 30, 2011 at 9:22 am
    Sep 15, 2011 at 10:15 am
  • Hello, I am encountering strange error using HBase 0.90.3, the scenario: I am writing KeyValues in Sequence files as an intermediate input for further bulk loading using MapReduce. The problem I am ...
    Stan BartonStan Barton
    Aug 4, 2011 at 1:54 pm
    Sep 6, 2011 at 3:49 pm
  • In my cluster(version 0.90.3) , The root table couldn't be opened when one region server crashed because of gc. The logs show: // Master assigned the root table to 82 2011-07-28 21:34:34,710 DEBUG ...
    Aug 11, 2011 at 2:06 am
    Aug 16, 2011 at 6:47 am
  • I’m not exactly at my wit’s end, but I could use some insight here from someone who is intimately familiar with region splitting. Any guidance (clearing up misunderstandings) would be great. I’ll ...
    Joseph PallasJoseph Pallas
    Aug 19, 2011 at 2:56 am
    Sep 6, 2011 at 10:41 pm
  • I have a bunch of integration tests that spend a lot of time creating and deleting tables in a mini hbase cluster started using HBaseTestingUtility. Disabling and deleting a table seems to take a ...
    Garrett WuGarrett Wu
    Aug 16, 2011 at 12:13 am
    Sep 2, 2011 at 1:10 am
  • Hello, How to explain that: 2011-08-08T19:02:24.947+0000: 14564.360: [GC 14564.360: [ParNew: 52681K- 6528K(59008K), 158.6620830 secs] 2285054K- 2240073K(4187776K) icms_dc=0 , 158.6622690 secs] ...
    Fuad EfendiFuad Efendi
    Aug 8, 2011 at 7:29 pm
    Aug 29, 2011 at 7:03 pm
  • I was looking at a problem a coworker had. He was unable to create any tables in HBase. As it turned out he had created a RegionObserver and loaded it at HBase start, which (as a test) just returned ...
    Lars hofhanslLars hofhansl
    Aug 27, 2011 at 3:58 am
    Aug 27, 2011 at 8:21 am
  • I'm trying to fully understand all the possibilities of what HBase has to offer but I can determine a valid use case for multiple versions. Can someone please explain some real life use cases for ...
    Aug 17, 2011 at 3:53 pm
    Aug 26, 2011 at 5:03 pm
  • Hi, On thread "operational overhead for HBase", J-D gave out some interesting insights into automated deployments: " - Have tools to automate cluster maintenance, such as doing rolling upgrades. We ...
    Alex HolmesAlex Holmes
    Aug 17, 2011 at 8:42 pm
    Aug 22, 2011 at 10:42 pm
  • "This class is not thread safe for updates; the underlying write buffer can be corrupted if multiple threads contend over a single HTable instance." Does that mean HTable is thread safe if we only ...
    Yi LiangYi Liang
    Aug 14, 2011 at 7:25 am
    Aug 16, 2011 at 3:02 pm
  • Currently coprocessors can't do any streaming operations. I think that would be a necessary feature to perform long running operations on the server (like scans) that in turn could produce a lot of ...
    Lars hofhanslLars hofhansl
    Aug 9, 2011 at 12:39 am
    Aug 12, 2011 at 5:32 pm
  • Hi All, I have the problem in my HBase fully distributed mode with backup master . The HBase in the fully distributed mode is starting and working properly. The Active Master is working and My backup ...
    Aug 2, 2011 at 11:13 am
    Aug 4, 2011 at 10:21 am
  • After the reducer phase the table.put(put) part insert content twice in the table 1)as actual key value 2)actual key and value as empty string. Can anyone give me as solution to this issue
    Aug 30, 2011 at 4:25 pm
    Aug 30, 2011 at 7:18 pm
  • Hi Friends, I have a query regarding scan operation on composite keys. I have table as follows : admin/user1 column=info:email, timestamp=1314594930540, value=abc admin/ user1 column=info:mobile, ...
    Stuti AwasthiStuti Awasthi
    Aug 29, 2011 at 7:39 am
    Aug 30, 2011 at 3:51 am
  • Hi all, i want to know the actual location of .META. and ROOT data after we install HBase in our machine. i mean, can i directly see that data in a particular file or something like that unlike ...
    Vamshi krishnaVamshi krishna
    Aug 18, 2011 at 3:05 am
    Aug 29, 2011 at 4:36 pm
  • Hi, cluster details: hbase 0.90.2. 10 machines. 1GB switch. use-case M/R job that inserts about 10 million rows to hbase in the reducer, followed by M/R that works with hdfs files. When the first job ...
    Lior SchachterLior Schachter
    Aug 14, 2011 at 4:32 pm
    Aug 16, 2011 at 4:22 pm
  • Hi all, I'm trying to wrap my head around HBase schema design and I am having trouble modeling the following use case: We store all our use behavior (clicks, searches, page views) in Hadoop and we ...
    Aug 13, 2011 at 6:01 pm
    Aug 15, 2011 at 8:34 pm
  • Hello, Is there a way to copy all the information one row contains to another row without taking all data through the client? Thanks, -- Ioan Eugen Stan http://ieugen.blogspot.com/
    Ioan Eugen StanIoan Eugen Stan
    Aug 2, 2011 at 9:13 am
    Aug 2, 2011 at 8:18 pm
  • A few questions about HFiles and MapReduce: 1. Is there any case where it's a bad idea to use HFileOutputFormat instead of TableOutputFormat when writing to HBase from MapReduce? 2. What are the ...
    Leif WicklandLeif Wickland
    Aug 1, 2011 at 7:51 pm
    Aug 2, 2011 at 4:47 pm
  • Great that you have thought of doing an ORM for HBase. recently, our company has a project base on the hbase, and i'am a newcomer, who just graduated from university last June. for study ,I need the ...
    Aug 29, 2011 at 2:52 pm
    Jan 6, 2014 at 10:49 am
  • Hello, i would like to know in which Version of HBase is Coprocessor official integrated. Thank you. Regards, Frank -- View this message in context: ...
    Aug 31, 2011 at 3:10 pm
    Sep 1, 2011 at 12:35 am
  • I noticed that after running some hefty jobs on our cluster that 3 out of 5 of our HBase region servers were killed. First off, when this happens and there are only 2 servers is there a possibility ...
    Aug 25, 2011 at 12:19 am
    Aug 25, 2011 at 5:02 pm
  • Hi, I started to use bulk upload and encounter a strange problem. I'm using Cloudera cdh3-u1. I'm using HFileOutputFormat.configureIncrementalLoad() to configure my job. This method create partition ...
    Ophir CohenOphir Cohen
    Aug 11, 2011 at 8:10 am
    Aug 16, 2011 at 9:28 am
  • Hi Friends, I am newbee in Hbase. I was trying to setup Hbase with Quick start tutorial. But facing issues in creating the table : Below is the error on Hbase shell : hbase(main):001:0 create ...
    Stuti AwasthiStuti Awasthi
    Aug 13, 2011 at 9:04 pm
    Aug 14, 2011 at 7:02 am
  • I want to do client-side write-caching to hbase. I see the setAutoFlush method in HTable. I do not see that in the HTableInterface that is returned from HTablePool. Is there something equivalent to ...
    Steve BoyleSteve Boyle
    Aug 12, 2011 at 6:02 am
    Aug 12, 2011 at 10:53 pm
  • if a table in oracle has a size of 100T, and then put it into hbase, how much space normally will hbase take?
    Aug 6, 2011 at 2:19 pm
    Aug 9, 2011 at 4:45 pm
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143 users for August 2011

Jean-Daniel Cryans: 74 posts Stack: 54 posts Lars hofhansl: 35 posts Mark: 32 posts Stuti Awasthi: 28 posts Doug Meil: 26 posts Andrew Purtell: 20 posts Geoff Hendrey: 14 posts Shanmuganathan.r: 13 posts Sonal Goyal: 13 posts High pointe: 12 posts Ryan Rawson: 12 posts Steinmaurer Thomas: 12 posts Buttler, David: 11 posts Christopher Tarnas: 11 posts Srikanth P. Shreenivas: 11 posts Ted Yu: 11 posts Jimson K. James: 10 posts Rohit Nigam: 10 posts Anurag Awasthi: 9 posts
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