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Errors after major compaction - HBase - [mail # user]
... reduced the TTL on the table and initiated major compaction. This should have reduced the table size to about 20% of its original size. Today, I'm getting errors of inaccessible files on HDFS...
..._674206 blk_5053643911633142711_669194 blk_-2636977729205236686_674664  I assume the file loss is somehow related to this change and the major compaction that followed because the same scan...
   Author: Eran Kutner, 2011-06-30, 10:58
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    ...
   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...
   Author: Oleg Ruchovets, 2011-05-16, 10:42
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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   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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   Author: Otis Gospodnetic, 2011-02-16, 12:30
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
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
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
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
What is HBase compaction-queue-size at all? - HBase - [mail # user]
...Any one knows what compaction queue size is meant?  By doc's definition:  *9.2.5.* hbase.regionserver.compactionQueueSize Size of the compaction queue. This is the number of stores...
... in the region that have been targeted for compaction.      - Is it the *number of Store* of regionserver need to be major compacted    ? or numbers of which is* being* compacted currently ?  I have...
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   Author: 林煒清, 2013-12-02, 06:00
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