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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 Fri, 04 May 2012 17:20:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268546#comment-13268546
] 

Phabricator commented on HBASE-5494:
------------------------------------

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

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/master/HMaster.java:1391 Great catch. I mentally thought
I did this, but I did not. For operations that do non-trivial work before locking, I think
it makes sense to have BEFORE_LOCK events as well. Will do this.

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

BRANCH
  table_level_ddl_locks

                
> 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, D2997.4.patch, D2997.5.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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