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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5494) Introduce a zk hosted table-wide read/write lock so only one table operation at a time
Date Thu, 03 May 2012 23:54:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267957#comment-13267957
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Phabricator commented on HBASE-5494:
------------------------------------

tedyu has commented on the revision "[jira] [HBASE-5494] [89-fb] Table-level locks for schema
changing operations.".

INLINE COMMENTS
  src/test/java/org/apache/hadoop/hbase/util/DelayInducingInjectionHandler.java:57 Good finding.
  Maybe remove the latch after line 60 before returning ?
  src/test/java/org/apache/hadoop/hbase/zookeeper/TestDistributedLock.java:2 No year is needed.

REVISION DETAIL
  https://reviews.facebook.net/D2997

                
> Introduce a zk hosted table-wide read/write lock so only one table operation at a time
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-5494
>                 URL: https://issues.apache.org/jira/browse/HBASE-5494
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: stack
>         Attachments: D2997.3.patch
>
>
> I saw this facility over in the accumulo code base.
> Currently we just try to sort out the mess when splits come in during an online schema
edit; somehow we figure we can figure all possible region transition combinations and make
the right call.
> We could try and narrow the number of combinations by taking out a zk table lock when
doing table operations.
> For example, on split or merge, we could take a read-only lock meaning the table can't
be disabled while these are running.
> We could then take a write only lock if we want to ensure the table doesn't change while
disabling or enabling process is happening.
> Shouldn't be too hard to add.

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