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https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267820#comment-13267820
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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/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWrapper.java:1321
Another option is to leave the lock znode at time of lock release instead of
calling zkWrapper.deleteZNode() every time.
We can use the znode version and data for the node to distinguish who is the
winner trying to acquire the lock.
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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