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111 discussions - 605 posts

  • Dear HBase-Pros, we face a serious issue with our HBase production cluster for two days now. Every couple minutes, a random RegionServer gets stuck and does not process any requests. In addition this ...
    Johannes SchabackJohannes Schaback
    Aug 22, 2014 at 5:29 pm
    Aug 24, 2014 at 8:03 am
  • I used the copy table command to copy a database between the original cluster A and a new cluster B. I have noticed that the rootdir is larger than 2X the size of the original. I am trying to account ...
    Colin Kincaid WilliamsColin Kincaid Williams
    Aug 7, 2014 at 9:01 pm
    Aug 13, 2014 at 3:46 am
  • Hi, According to http://hbase.apache.org/book/number.of.cfs.html, having more than 2~3 column families are strongly discouraged. BTW, in my case, records on a table have the following ...
    innowireless TaeYun Kiminnowireless TaeYun Kim
    Aug 5, 2014 at 11:10 am
    Aug 7, 2014 at 5:36 am
  • Hi, we're running 0.98.3 hbase, and it seems like the ipc queueSize is not always being reduced. Graphing the metric from jmx, at the start it stays at zero and spikes up and returns back to zero. At ...
    Walter KingWalter King
    Aug 7, 2014 at 3:43 pm
    Aug 11, 2014 at 8:11 pm
  • Hello- We recently realized our region size is 1G and need to increase it to get our region count under control. I've done some research on merging regions and have come away confused. There is the ...
    Ted TuttleTed Tuttle
    Aug 28, 2014 at 6:20 pm
    Aug 28, 2014 at 10:59 pm
  • Hi All, As we know, All rows are always sorted lexicographically by their row key. In lexicographical order, each key is compared at binary level, byte by byte and from left to right. See the example ...
    @Sanjiv Singh@Sanjiv Singh
    Aug 27, 2014 at 10:10 am
    Aug 28, 2014 at 5:58 am
  • hi i am running HBase 0.94.20 on Hadoop 2.2.0 i am using MultiTableOutputFormat, for writing processed output to two different tables in hbase. here's the code snippet private ImmutableBytesWritable ...
    Yeshwanth kumarYeshwanth kumar
    Aug 26, 2014 at 4:18 pm
    Aug 26, 2014 at 8:01 pm
  • Hello, To make clarify more on the subject I made another simpler test case: Code executed: @Test public void testHbasePutDeleteCell() throws Exception { TableName tableName = ...
    Armaselu, CristianArmaselu, Cristian
    Aug 19, 2014 at 7:46 pm
    Aug 21, 2014 at 8:25 pm
  • Hi, We are running CDH 4.5, 6 nodes with hbase cluster (0.94.6). We configured major compaction to run once a week. During this time we are getting timeouts while writing to hbase (application ...
    yanivGyanivG
    Aug 14, 2014 at 4:59 pm
    Aug 21, 2014 at 6:00 pm
  • Hi all: I saw some interesting results from Hortonworks blog (block cache <http://zh.hortonworks.com/wp-content/uploads/2014/03/perfeval_blockcache_v2.pdf ). In this result, the ratio of memory ...
    牛兆捷牛兆捷
    Aug 20, 2014 at 3:42 am
    Sep 17, 2014 at 2:24 am
  • Hi, I'm trying to understand how does connection pooling works in HBase. I've seen that https://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HConnectionManager.html is recommended to use ...
    Serega SheypakSerega Sheypak
    Aug 4, 2014 at 5:44 pm
    Aug 21, 2014 at 8:25 am
  • Hi, everyone My application will hold tens of thousands of ResultScanner to get Data. Will it hurt the performance and network resources? If so, is there any way to solve it? Thanks, Kevin.
    Dai, KevinDai, Kevin
    Aug 26, 2014 at 7:14 am
    Aug 28, 2014 at 8:08 am
  • Hello- We are running HBase v0.94.16 on an 8 node cluster. We have a recurring problem w/ HBase clients hanging. In latest occurrence, I observed the following sequence of events: 0) client plays w/ ...
    Ted TuttleTed Tuttle
    Aug 13, 2014 at 11:38 pm
    Aug 15, 2014 at 2:15 am
  • HI, I am really stuck with this. Putting the stack trace, java file, hbase-site file and pom file here. I have 0 knowledge about hadoop and expecting it's transparent for my integration test :( ...
    Mingtao ZhangMingtao Zhang
    Aug 2, 2014 at 4:52 pm
    Aug 2, 2014 at 8:17 pm
  • Hello, I have written a program in Java that is supposed to update rows in a Hbase table that do not yet have a value in a certain column (blob values of between 5k and 50k). The program keeps track ...
    Magana-zook, Steven AlanMagana-zook, Steven Alan
    Aug 22, 2014 at 4:27 pm
    Aug 23, 2014 at 12:47 am
  • ​The 1st HBase 0.98.​5 release candidate (RC0) is available for download ​at http://people.apache.org/~apurtell/0.98.5RC0/ and Maven artifacts are also available in the temporary repository ​ ...
    Andrew PurtellAndrew Purtell
    Aug 5, 2014 at 7:21 am
    Aug 12, 2014 at 3:25 pm
  • I'm experimenting with HBase (0.94.4) and Hadoop (1.0.4) runtime balancers on just a very tiny 4 node cluster and finding that performance is bad for an hour after adding new nodes, even though all ...
    Eric KEric K
    Aug 22, 2014 at 6:20 pm
    Sep 5, 2014 at 7:35 am
  • Hi all, i read in documentation that max region count per region server should be around 200. I unfortunately have currently 800 regions for RS. Those tables are not presplitted (all handled by ...
    Juraj jivJuraj jiv
    Aug 15, 2014 at 7:45 am
    Aug 18, 2014 at 2:12 pm
  • And I have a program that do some read operations and it hangs. And I am seeing 2014-08-10 12:22:05,359 DEBUG [main] client.HConnectionManager$HConnectionImplementation: Removed all cached region ...
    Thomas KwanThomas Kwan
    Aug 10, 2014 at 5:27 pm
    Aug 11, 2014 at 2:55 am
  • Hi, This is a newbie question. What is in a HBase block index entry? My guess is that it's one of these: 1. all key components: rowkey + column family + column qualifier + timestamp 2. all key ...
    innowireless TaeYun Kiminnowireless TaeYun Kim
    Aug 5, 2014 at 2:24 am
    Aug 7, 2014 at 5:06 am
  • I have a table already created and with some data. I want to split it trough code using HBaseAdmin api into multiple regions, while specifying keys that do not exist in the table. I am getting the ...
    Shahab YunusShahab Yunus
    Aug 19, 2014 at 8:11 pm
    Aug 20, 2014 at 8:56 pm
  • I am getting the below exception during 'flush table' operation (when the table with column families are AES encrypted) And it is randomly coming, not always. Is it a bug, or any thing I missed in my ...
    Shankar hiremathShankar hiremath
    Aug 8, 2014 at 5:36 am
    Aug 8, 2014 at 8:23 pm
  • Hi all, when I'm trying to execute a MapReduce-Job over the HBase-Java-API I get an exception with the follwoing Stacktrace: java.util.NoSuchElementException at ...
    Malte MaltesmannMalte Maltesmann
    Aug 25, 2014 at 12:48 pm
    Sep 3, 2014 at 9:49 am
  • Hello- How does HBase handle region servers with unequal storage capacity? We made the original nodes of our cluster a bit light on storage and are wondering what would happen is we started adding ...
    Ted TuttleTed Tuttle
    Aug 22, 2014 at 8:52 pm
    Aug 22, 2014 at 9:54 pm
  • Lately, on a single node test installation, I noticed that the Hadoop/Hbase folder /hbase/.corrupt got quite big (probably due to failed log splitting due to lack of disk space). Is it safe to simply ...
    Henning BlohmHenning Blohm
    Aug 11, 2014 at 7:28 pm
    Aug 22, 2014 at 8:24 am
  • Say I have 100 split files on 10 region servers, and I did a major compact. Will these split files be distributed like this: reg1: [splits 1,2,..,10] reg2: [splits 11,12,...,20] ... Or like this ...
    Jianshi HuangJianshi Huang
    Aug 15, 2014 at 5:54 am
    Aug 19, 2014 at 9:45 am
  • Can you show us the contents of solr lib and the classpath ? Thanks
    Ted YuTed Yu
    Aug 13, 2014 at 12:19 pm
    Aug 14, 2014 at 6:25 am
  • I have a hbase table with more than 2G rows. Every hour there comes 5M~10M row ids and i must get all the row info from the hbase table. But even I use the batch call(1000 row ids as a list) as ...
    LeiwangoucLeiwangouc
    Aug 13, 2014 at 7:35 am
    Aug 14, 2014 at 1:55 am
  • Most of our users migrated their data form MySQL to HBase. Before they totally trust HBase, they use MySQL and HBase at the same time. Sometimes the data is inconsistent because they use it ...
    TobeTobe
    Aug 12, 2014 at 3:56 am
    Aug 13, 2014 at 6:21 am
  • What is the meaning of the progress value below? I see the information broken down below in the following HBase UI. http://region-server-ip:60030/rs-status?filter=general#regionCompactStats Region ...
    Geovanie MarquezGeovanie Marquez
    Aug 11, 2014 at 4:49 pm
    Aug 11, 2014 at 8:49 pm
  • Hi, we have 10^8 small jpg/png images each size is 20-100 Kb. They are thumbs. These images are used in many web-sites as static content. Is it good Idea to place them to HBase and serve to users? ...
    Serega SheypakSerega Sheypak
    Aug 8, 2014 at 7:47 am
    Aug 8, 2014 at 1:07 pm
  • Hi, all, As I understand, HBase will automatically split a region when the region is too big. So in what scenario, user needs to do a manual split? Could someone kindly give me some examples that ...
    Liu, Ming (HPIT-GADSC)Liu, Ming (HPIT-GADSC)
    Aug 6, 2014 at 6:30 am
    Aug 6, 2014 at 8:29 pm
  • Hi Team, I have installed following hadoop family concepts and tried to build Oozie 4.0.1 on Hbase 0.98.3 but by default Oozie was built on 0.94.2. Please guide me on steps to build oozie on ...
    Hima binduHima bindu
    Aug 2, 2014 at 12:00 am
    Aug 2, 2014 at 12:40 am
  • Hi, I run periodically verify jobs on our hbase tables. One some tables i have problems with many BADROWS. I looked into the job log file and recognized that the job started to compare different ...
    Hansi KloseHansi Klose
    Aug 26, 2014 at 8:10 am
    Aug 28, 2014 at 1:06 am
  • Hi, I am running a cluster with 4 node and HDFS in HA mode. Machine1, machine2, machine3 and machine4. And I am performing the following operations respectively. 1. create table with precreated ...
    Sreenivasulu ySreenivasulu y
    Aug 25, 2014 at 1:40 am
    Aug 25, 2014 at 11:29 am
  • From the book named "Hbase: the Definitive Guide", i know that there is a condition to trigger major compaction, i.e. a thread controlled by "hbase.server.thread.wakefrequency(10 seconds by default)" ...
    ChenwenhuiChenwenhui
    Aug 21, 2014 at 10:01 am
    Aug 22, 2014 at 8:49 am
  • Hi, I am working on https://issues.apache.org/jira/browse/STORM-444. The task is very similar to https://issues.apache.org/jira/browse/OOZIE-961. Basically in storm secure mode we would like to fetch ...
    Parth BrahmbhattParth Brahmbhatt
    Aug 14, 2014 at 12:09 am
    Aug 15, 2014 at 9:07 pm
  • Hi there I have a use-case where I need to do a read to check if a hbase entry is present, then I do a put to create the entry when it is not there. I have a script to get a list of rowkeys from hive ...
    Thomas KwanThomas Kwan
    Aug 14, 2014 at 5:32 pm
    Aug 15, 2014 at 7:35 am
  • I am trying to make few changes to the specific version of hbase. Is there an easy way to checkout that from github? Also does master correspond to stable version? Is there any link that describes ...
    Gomathivinayagam MuthuvinayagamGomathivinayagam Muthuvinayagam
    Aug 11, 2014 at 10:56 pm
    Aug 11, 2014 at 11:49 pm
  • Hello, In our hbase cluster memstore flush size is 128 mb. And to insert data to tables, we only use bulk load tool. Since bulk loading bypasses memstores, they are never used, so we want to minimize ...
    OzhangOzhang
    Aug 3, 2014 at 6:23 pm
    Aug 4, 2014 at 1:38 am
  • Dear experts , I understand that I can do a simple command like: echo "scan 'table1'"| hbase she'll myoutput This scenario i am thinking is to: 1) output to local file system(like Linux ) instead of ...
    Demai NiDemai Ni
    Aug 19, 2014 at 11:27 pm
    Aug 21, 2014 at 4:13 pm
  • Hi HBase users, I wonder if anyone knows how to make change to the MAX_FILES_PER_REGION_PER_FAMILY in LoadIncrementalHFiles? The default value is 32 which is quite small. HBase Version 0.98 Thank ...
    Jerry LamJerry Lam
    Aug 20, 2014 at 2:46 pm
    Aug 20, 2014 at 5:24 pm
  • Hi, My rowkey is sessionid|hash(pageurl)|timestamp When I scan using a prefix filter with a specific sessionid, will it give me the result in sequence? For example, the expected sequence in my mind ...
    Mingtao ZhangMingtao Zhang
    Aug 16, 2014 at 9:27 pm
    Aug 16, 2014 at 10:12 pm
  • Hi We are running hbase 0.94.6 cdh 4.4 and have a problem with one table not being assigned to any region. This is the SYSTEM.TABLE in Phoenix so all tables are basically non functional at the ...
    Kristoffer SjögrenKristoffer Sjögren
    Aug 14, 2014 at 2:32 pm
    Aug 15, 2014 at 6:22 pm
  • Hello, We'v been using and loving Hbase for couple of months now. Our primary usecase for Hbase is writing events in stream to an online time series Hbase table. Every so often we run medium to large ...
    GautamGautam
    Aug 12, 2014 at 9:59 pm
    Aug 13, 2014 at 12:57 am
  • I notice that when I have a regions with store file counts greater than hbase.hstore.blockingStoreFiles, on cluster startup the number drops dramatically under this value to just under the ...
    Geovanie MarquezGeovanie Marquez
    Aug 10, 2014 at 2:18 pm
    Aug 10, 2014 at 9:32 pm
  • Take a look at this method in Cell: byte[] getFamilyArray(); Cheers
    Ted YuTed Yu
    Aug 5, 2014 at 4:33 am
    Aug 10, 2014 at 8:42 pm
  • Hi, I want to build an hbase runtime from src file. When I used mvn package, all the dependencies jars are downloaded into the local .m2 repository. I want to build an hbase runtime like what is ...
    Yun pengYun peng
    Aug 9, 2014 at 1:41 am
    Aug 9, 2014 at 2:42 pm
  • Hi, sry for asking a fundamental newbie question again :/. But after coding some applications with using hbase I want to reconsider the security. Especially after today some (i.e. billions) e-mail ...
    Wilm SchumacherWilm Schumacher
    Aug 6, 2014 at 4:46 am
    Aug 7, 2014 at 6:44 pm
  • So far, I have found two problems about this. Firstly, HBase-11675 <https://issues.apache.org/jira/browse/HBASE-11675 . It's a little tricky and rarely happens. But it asks users to be careful of ...
    TobeTobe
    Aug 25, 2014 at 9:54 am
    Aug 26, 2014 at 12:03 pm
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115 users for August 2014

Ted Yu: 92 posts Jean-Marc Spaggiari: 32 posts Esteban Gutierrez: 23 posts Andrew Purtell: 20 posts Lars hofhansl: 15 posts Mingtao Zhang: 15 posts Qiang Tian: 15 posts Shahab Yunus: 14 posts Tobe: 14 posts innowireless TaeYun Kim: 13 posts Jianshi Huang: 13 posts Nick Dimiduk: 13 posts Arthur Hk Chan: 12 posts Michael Stack: 12 posts Serega Sheypak: 12 posts Ted Tuttle: 11 posts Anil Gupta: 10 posts Anoop John: 8 posts Colin Kincaid Williams: 8 posts Johannes Schaback: 8 posts
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