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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 Sun, 06 May 2012 04:04:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269113#comment-13269113
] 

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

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

  Hi Prakash.

  Thanks for the comments! I'll chat with you on Monday about the potential issue around handling
connection loss (I was under impression that RecoverableZookeeper handles that).

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWrapper.java:1336 Isn't this handled
by RecoverableZooKeeper?
  src/main/java/org/apache/hadoop/hbase/zookeeper/DistributedLock.java:112 This is to verify
that we are only releasing a lock that we ourselves acquire, and that code doesn't (accidentally)
release lock acquired by other threads/processes.
  src/main/java/org/apache/hadoop/hbase/zookeeper/DistributedLock.java:294 Good catch, will
handle 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, D2997.6.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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