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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14575) Reduce scope of compactions holding region lock
Date Mon, 02 Nov 2015 23:23:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-14575:
---------------------------
    Description: 
Per [~devaraj]'s idea on parent issue, let's see if we can reduce the scope of critical section
under which compactions hold the region read lock.

Here is summary from parent issue:

Another idea is we can reduce the scope of when the read lock is held during compaction. In
theory the compactor only needs a region read lock while deciding what files to compact and
at the time of committing the compaction. We're protected from the case of region close events
because compactions are checking (every 10k bytes written) if the store has been closed in
order to abort in such a case.

  was:
Per [~devaraj]'s idea on parent issue, let's see if we can reduce the scope of critical section
under which compactions hold the region read lock.

Another idea is we can reduce the scope of when the read lock is held during compaction. In
theory the compactor only needs a region read lock while deciding what files to compact and
at the time of committing the compaction. We're protected from the case of region close events
because compactions are checking (between every Cell!) if the store has been closed in order
to abort in such a case.


> Reduce scope of compactions holding region lock
> -----------------------------------------------
>
>                 Key: HBASE-14575
>                 URL: https://issues.apache.org/jira/browse/HBASE-14575
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction, regionserver
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>         Attachments: 14575-v1.patch, 14575-v2.patch, 14575-v3.patch, 14575-v4.patch,
14575.v00.patch
>
>
> Per [~devaraj]'s idea on parent issue, let's see if we can reduce the scope of critical
section under which compactions hold the region read lock.
> Here is summary from parent issue:
> Another idea is we can reduce the scope of when the read lock is held during compaction.
In theory the compactor only needs a region read lock while deciding what files to compact
and at the time of committing the compaction. We're protected from the case of region close
events because compactions are checking (every 10k bytes written) if the store has been closed
in order to abort in such a case.



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