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blog on compaction - HBase - [mail # user]
...Hi, Recently there have been some questions and answers on compaction in HBase.  I came up with the following blog which covers a portion of the discussions:  http...
...://zhihongyu.blogspot.com/2013/03/compactions-q.html  Special thanks go to J-D, Anoop, Ramkrishna, Sergey, Elliot and Jean-Marc.  Cheers ...
   Author: Ted Yu, 2013-03-26, 17:19
Compaction problem - HBase - [mail # user]
...Hi I am using HBase 0.94.2 currently. While using it  , its write performance, due to compaction is being affeced by compaction. Please could you suggest some quick tips in relation to how...
   Author: tarang dawer, 2013-03-22, 11:44
Compaction time - HBase - [mail # user]
...Hi,     We are running some high load jobs which are mostly writes. During  these jobs, compaction is triggered which takes sometime as longs as  40mins to complete. This causes blocking...
... (as others wait for compaction  in the queue). Please suggest how much compaction time is reasonable for  compacting 2Gb store files . And best way to avoid long blocking  compactions. Using...
   Author: samar.opensource, 2013-03-04, 06:44
Timeouts during major compaction - HBase - [mail # user]
...We are running major compaction once a week, on a 6 nodes hbase cluster. We see that we are getting timeouts in our application. We see also in JMX metrics the following: 1. compaction time...
... avg was 200 seconds instead of 3 seconds 2. ParNew collection time was twice than usual 3. Compaction queue size was high 4. Region number increased at that time 5. Disk I\O read...
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   Author: yanivG, 2014-06-17, 12:03
Re: "compact" command cannot trigger major compaction - HBase - [mail # user]
...did you tried to use the "major_compact" command? hbase> major_compact 't1' Matteo On Fri, Feb 21, 2014 at 9:40 AM, Ramon Wang  wrote:   ...
   Author: Matteo Bertozzi, 2014-02-21, 09:44
major compaction - HBase - [mail # user]
...Hello,  When I do a major compaction of a table (1 billion rows). How do I know when its completed? Also, what can I see in the metrics to see the status of it  ...
   Author: Rita, 2011-11-27, 12:41
Compaction problems - HBase - [mail # user]
...I have a busy region, and there are 43 StoreFiles (> compactionThreshold=8) in this region. Now, I stopped the client and stopped put new data into it. I expect these Store...
...Files to be compacted later.  But, one day after, these 43 StoreFiles are still there.  It seems the compaction does not work automatically. And I checked the code, it seems the compaction would only start...
   Author: Schubert Zhang, 2011-04-27, 01:32
compaction failure - HBase - [mail # user]
...Hi, :   I found lots of error saying compaction  failed, does anybody know how  to get around this  problem ?   Jimmy.    2010-06-23 00:01:17,407 DEBUG  org.apache.hadoop.hbase.regionserver.Compact...
...SplitT hread: Compaction requested for region Spam_MsgEventTable,2010-06-22  13:17:04\x0 915e45cc95fa9201b366dc7316dd88438,1277244197913/1155282109 because:  regionserver /10.110.8.91:60020.cache...
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   Author: Jinsong Hu, 2010-06-23, 21:26
Custom compaction - HBase - [mail # user]
...Is there a way to customize the compaction function (like a hook provided b y the API) or is it invisible to the user?  Thank you Vidhya ...
   Author: Vidhyashankar Venkatarama..., 2010-05-26, 22:56
Deleted cells surviving compaction - HBase - [mail # user]
...My understanding of delete operations is that a delete essentially writes out a tombstone for the cell.  Cells aren't actually deleted until a major compaction. I performed the following...
... sequence on a single cell: 1) Put 2) Delete with a timestamp of HConstants.LATEST_TIMESTAMP 3) Major compact table 4) Put 5) Do a regular scan or get... no value returned 6) Do a raw scan, and I...
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   Author: David Larsen, 2014-03-26, 01:51
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