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[expand - 1 more] - Compaction in 0.90.3 - HBase - [mail # user]
...Hi guys,  I would like to temporarily reduce the number of changes to hfiles through minor and major compactions and splitting to a minimum. Is there a way to achieve this without having...
   Author: Matthias Hofschen, 2013-09-03, 08:30
[expand - 1 more] - Configs for Hbase compaction switch... - HBase - [mail # user]
...I want to run some experiments with the major compactions turned off..  There are two parameters that I can see both of which have to be modified t o turn major compactions off (am I right...
... here?). hbase.hstore.compactionThreshold and hbase.hregion.majorcompaction...  But the config file's comments say that setting compactionThreshold to a hi gh value may lead to memory issues...
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   Author: Vidhyashankar Venkatarama..., 2010-05-25, 14:06
[expand - 1 more] - Region spiting, compaction and merging - HBase - [mail # user]
... to run manually major compaction to get rid of invalidated data (from around 500MB to 0MB and few in memStore according to UI). As far as can see in the logs there were no major compactions since...
... compaction at some particular period - i.e 5 a.m, so it doesn't generate unnecessary load during hot periods like in the evening where there is a strong demand for performance? Or maybe I am...
   Author: Michał Podsiadłowski, 2010-03-31, 10:28
[expand - 22 more] - flushing + compactions after config change - HBase - [mail # user]
....hregion.majorcompaction     0     Prior to this, all the settings were default values. I wanted to increase the write throughput on my system and also control when major compactions happen. In addition to that, I...
... wanted to make sure that my regions don't split quickly.  After the change in settings, I am seeing a huge storm of memstore flushing and minor compactions some of which get promoted to major...
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   Author: Viral Bajaria, 2013-06-27, 07:40
[expand - 6 more] - difference between major and minor compactions? - HBase - [mail # user]
...Hi, All  I am asking the different practices of major and minor compaction... My current understanding is that minor compaction, triggered automatically, usually run along with online query...
... serving (but in background), so that it is important to make it as lightweight as possible... to minimise downtime (pause time) of online query.  In contrast, the major compaction is invoked...
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   Author: yun peng, 2013-06-22, 12:05
[expand - 2 more] - Re: Region statistics created during major compaction - HBase - [mail # user]
...Interesting idea. How would the ranges of rows be determined per region ? This reminds me of stripe compaction feature which is in 0.98 See HBASE-7667 Cheers On Apr 30, 2014, at 3...
   Author: Ted Yu, 2014-04-30, 10:26
why  major_compaction does more performance consumption than  minor_compaction ? - HBase - [mail # user]
...hello everyone! Differenct between them: 1、minor_compact will select best storeFiles to compact。 2、major_compact will select all storeFiles to compact and do some clean work。 Region...
...Server holds only one compactSplitThread ,and only one compact task run ! 3、The compaction task just scans all the storefiles and then merge one, so I hold the opinon that major compact only cost...
   Author: Fx_Bull, 2014-06-20, 09:11
[expand - 1 more] - Compaction timing and recovery from failure - HBase - [mail # user]
...Everyone,  I recently had a couple compactions, minors that were promoted to  majors, take 8 and 10 minutes each.  I eventually killed the  regionserver underneath them as I'd never seen...
... compactions last that  long before.  In looking through the logs from the regionserver that was  killed and watching one of the regions after it was moved over, I saw  that it took about 3 minutes...
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   Author: Brennon Church, 2013-03-25, 14:03
[expand - 4 more] - Does a major compact flush memstore? - HBase - [mail # user]
...It seems to me that a major_compact table command from hbase shell do not fush memstore?  When I done with major compact, still some data in memstore and will be flush out to disk when I...
   Author: Liu, Raymond, 2013-03-12, 07:34
[expand - 3 more] - turn off size-based Major Compaction? - HBase - [mail # user]
...hi, folks, Is there a way to turn off Major Compaction, for sure? We are using 96.0, and set hbase.hregion.majorcompaction is 0. The intention was to only run major compaction manually...
.... It turns out after heavy load, major compaction still occur as shown in WebUI. After a bit search, I read this discussion: http://apache-hbase.679495.n3.nabble.com/Major-Compaction...
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   Author: Demai Ni, 2014-03-06, 18:29
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