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Re: Compaction problem - HBase - [mail # user]
...Wha is the rate at which you are flushing? Frequent flushes will cause more files and compaction may happen frequently but with lesser time. If the flush size is increased to a bigger value...
... then you will end up more time in the compaction because the entire file has to be read and rewritten.  After you check with the flush Q see what effect you get on increasing the memstore size...
   Author: ramkrishna vasudevan, 2013-03-26, 06:40
Re: Did major compaction really happen? - HBase - [mail # user]
...The main advantage you get by disabled major compaction is that the major compaction threads do not wake up to perform the major compaction and which is generally resource intensive...
   Author: ramkrishna vasudevan, 2013-12-20, 06:25
Re: Compaction timing and recovery from failure - HBase - [mail # user]
...My question is this.  If a compaction fails due to a regionserver loss mid-compaction, does the regionserver that picks up the region continue where the first left off?  Or does it have...
   Author: ramkrishna vasudevan, 2013-03-25, 14:08
Re: Does a major compact flush memstore? - HBase - [mail # user]
...Did you try from java api?  If flush does not happen we may need to fix it.  Regards RAm  On Tue, Mar 12, 2013 at 1:04 PM, Liu, Raymond  wrote:  ...
   Author: ramkrishna vasudevan, 2013-03-12, 09:39
Re: Getting the scan type at preCompact - HBase - [mail # user]
...You can do the same with preCompactScannerOpen() hook right. If the scanType is minor send a wrapped internalScanner say MinorCompactionScanner.  If the scanType is major send a wrapped...
... interanlScanner say MajorCompactionScanner.  Does that solve your purpose? Because if preCompactScannerOpen returns a scanner only that will  be used inside preCompact also.  Regards Ram  On Tue...
   Author: ramkrishna vasudevan, 2013-01-29, 14:45
Re: How to check if a major_compact is done? - HBase - [mail # user]
...There is no interface which says that the major compaction is completed.  But you can see that major compaction is in progress from the web UI. Sorry if am wrong here.  Regards Ram  On Thu...
   Author: ramkrishna vasudevan, 2012-11-08, 06:33
Re: How to prevent major compaction when doing bulk load provisioning? - HBase - [mail # user]
...I remember there was another user too who got the same issue. He thought the minor compaction to be major compaction and was saying that the setting that we provide to disable...
   Author: ramkrishna vasudevan, 2013-03-21, 18:05
Re: Filtering/Collection columns during Major Compaction - HBase - [mail # user]
...Hi Varun  If you are using 0.94 version you have a coprocessor that is getting invoked before and after Compaction selection. preCompactScannerOpen() helps you to create your own scanner...
   Author: ramkrishna vasudevan, 2012-12-10, 14:08
Re: Issues on disabling compaction in HBase 0.94.2 - HBase - [mail # user]
...Hi Yun,  Are you trying to disable Minor compactions?  Regards Ram  On Fri, Nov 23, 2012 at 5:20 AM, yun peng  wrote:  ...
   Author: ramkrishna vasudevan, 2012-11-23, 04:06
Re: Questions about HBase - HBase - [mail # user]
...   TTL or does only Major compaction do that Yes it applies for Minor compactions.    older than a certain time or to compress all the files except the latest    few? In the latest trunk...
... version the compaction algo itself can be plugged.  There are some coprocessor hooks that gives control on the scanner that gets created for compaction with which we can control the KVs being...
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   Author: ramkrishna vasudevan, 2013-06-05, 03:14
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