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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-3797) StoreFile Level Compaction Locking
Date Tue, 10 May 2011 23:37:47 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Spiegelberg resolved HBASE-3797.
----------------------------------------

       Resolution: Fixed
    Fix Version/s: 0.92.0

Added with Stack's requests.  Compaction throttling is turned off by default.  I agree that
it should be enabled by default, but decided to save that for another JIRA so we can discuss
how we arrive at the default.

> StoreFile Level Compaction Locking
> ----------------------------------
>
>                 Key: HBASE-3797
>                 URL: https://issues.apache.org/jira/browse/HBASE-3797
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>             Fix For: 0.92.0
>
>         Attachments: HBASE-3797+1476.patch
>
>
> Multithreaded compactions (HBASE-1476) will solve the problem of major compactions clogging
high-priority minor compactions.  However, there is still a problem here.  Since compactions
are store-level, the store undergoing major compaction will have it's storefile count increase
during the major.  We really need a way to allow multiple outstanding compactions per store.
 compactSelection() should lock/reserve the files being used for compaction.  This will also
allow us to know what we're going to compact when inserting into the CompactSplitThread and
make more informed priority queueing decisions.

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