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[expand - 5 more] - 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
[expand - 4 more] - 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
[expand - 21 more] - 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...
..._674664  I assume the file loss is somehow related to this change and the major compaction that followed because the same scan that is failing now was working fine yesterday and that is the only...
   Author: Eran Kutner, 2011-06-30, 10:58
[expand - 1 more] - 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
[expand - 5 more] - 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
[expand - 6 more] - 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
[expand - 13 more] - 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
[expand - 3 more] - Re: how to know run major compact successfully? - HBase - [mail # user]
...finally, it become 100%. How I don't know how to reproduce it. What I have done is deleting many rows and in hbase shell executing "major_compact 'tablename'" On Thu, Jun 19, 2014 at 7...
   Author: Li Li, 2014-06-20, 01:50
[expand - 6 more] - 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
[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
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