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https://issues.apache.org/jira/browse/HBASE-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269119#comment-13269119
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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.".
INLINE COMMENTS
src/main/java/org/apache/hadoop/hbase/zookeeper/DistributedLock.java:294 What
action of the lock-owner is associated with znode data change ?
I see znode creation and deletion, not data change.
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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