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Too many "Compaction Complete" messages - HBase - [mail # user]
... 2GB to 4GB, to avoid increasing the region count.  There were no reported problems or errors when I started back up, but ever since then I have had hundreds of "Compacting d in {sometable...
...}...... Compaction Complete" messages filling up my region server task status. It has been doing this with no appreciable change in pace for 5 days now.  When I look at the regionserver web UI, I see...
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   Author: Tom Brown, 2013-09-04, 02:13
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
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
Re: the occasion of the major compact? - HBase - [mail # user]
...I've had a similar question... perhaps the client promotes a compaction to "major" if:  a) the threshold for compaction is reached ( hbase.hstore.compactionThreshold ) or (and?) b...
...) the maximum number of files to process in a "minor" compaction is high enough to result in all files being processed into one ( hbase.hstore.compaction.max )   Can someone confirm if this is correct...
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   Author: Neil Yalowitz, 2012-01-26, 18:16
heavy writing and compaction storms - HBase - [mail # user]
...Hi all,  What strategies do HBase 0.90 users employ to deal with or avoid the so-called "compaction storm"?  I'm referring to the issue referred to in 2.8.2.7 here:  http...
..., creates a level increase of Storefiles on all regions.  When a compaction threshold is reached for one region, it is usually reached for many regions... causing many, many regions to request...
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   Author: Neil Yalowitz, 2012-01-12, 17:56
major compaction and regionserver failure... - HBase - [mail # user]
...    I was wondering if someone could tell me what happens if a regionserver  fails during major compaction.  Are the entries that were in the compaction  queue for the failed regionserver...
... migrated along with the regions to anoth er server or are those requests for major compaction effectively lost for t hat run of major compaction?  I guess what I'm really asking is do I still  get...
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   Author: Andy Sautins, 2011-12-10, 18:37
Re: When should we trigger a major compaction? - HBase - [mail # user]
...Ramon: See http://hbase.apache.org/book.html#compaction for description on compaction file selection. Cheers On Fri, Feb 21, 2014 at 4:38 AM, yonghu  wrote:   ...
   Author: Ted Yu, 2014-02-21, 13:01
big compaction queue size - HBase - [mail # user]
... value size up to 4MB per object).  I check the log of regionserver, it seems like the compaction queue size is about 1700, and every the compaction action takes about 1 minute, and more over...
..., most of the compaction are triggered to a major one.  My question are,  1. Would this cause the performance degradation? It seems like "GET" action in the interval that two minutes before...
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   Author: Xu-Feng Mao, 2011-09-06, 08:15
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
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
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