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https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13268412#comment-13268412
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Phabricator commented on HBASE-5494:
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tedyu has commented on the revision "[jira] [HBASE-5494] [89-fb] Table-level
locks for schema changing operations.".
I think this feature should leave ample room for region level lock, to be
developed in the future.
Meaning, znode for table level lock would always exist because it has
children znodes which represent region locks.
INLINE COMMENTS
src/main/java/org/apache/hadoop/hbase/zookeeper/DistributedLock.java:147 Can
this assumption be elaborated some more ?
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, 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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