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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...
[+ more]    Author: Matthias Hofschen, 2013-09-03, 08:30
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
HBase major_,compaction - HBase - [mail # user]
...  of regions even after I major_compact all tables. I t seems that major_com pact didn'tcompact any region.    What can I do to compact the regions and have fewer regions, and how can I  check...
... if the table is already compacted?    I'm using Hbase 0.90.2.    Thanks,    Miguel    ...
[+ more]    Author: Miguel Costa, 2011-05-25, 20:13
major compaction best practice - HBase - [mail # user]
... compaction best practices:  1) Have we to run it automatically or manually 2) How ofter it should run 3) Where can I read about compaction process and does it have potential problem that I should...
[+ more]    Author: Oleg Ruchovets, 2011-05-16, 10:42
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...
[+ more]    Author: Ted Yu, 2014-04-30, 10:26
Re: Major compaction time - HBase - [mail # user]
...You are running w/ the defaults where major compaction runs every day?  It depends on how your data is changing but at the extreme, a major compaction is a rewrite of the total data set...
....  We'll usually suggest that folks turn off the auto-major compaction and instead run it manually at time of low loading -- evening or w/e dependent on traffic -- or that they manage it in some...
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[+ more]    Author: Stack, 2011-03-09, 18:25
Major compactions and OS cache - HBase - [mail # user]
... house keeping on a regular basis. These so called compactions rewrite  files as new data is added over time. All files in HDFS once written are  immutable (for all sorts of reasons). Because...
... of  that, data is written into  new files and as their number grows HBase compacts them into another set of  new, consolidated files. And here is  the kicker: HDFS is smart enough to put  the data...
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[+ more]    Author: Otis Gospodnetic, 2011-02-16, 12:30
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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[+ more]    Author: Viral Bajaria, 2013-06-27, 07:40
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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[+ more]    Author: yun peng, 2013-06-22, 12:05
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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[+ more]    Author: Vidhyashankar Venkatarama..., 2010-05-25, 14:06
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