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https://issues.apache.org/jira/browse/HBASE-10136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell resolved HBASE-10136.
-----------------------------------------
Resolution: Not A Problem
> the table-lock of TableEventHandler is released too early because
> reOpenAllRegions() is asynchronous
> ----------------------------------------------------------------------------------------------------
>
> Key: HBASE-10136
> URL: https://issues.apache.org/jira/browse/HBASE-10136
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.98.0, 0.96.0, 0.99.0
> Reporter: Aleksandr Shulman
> Priority: Major
> Labels: online_schema_change
> Attachments: HBASE-10136-trunk.patch, HBASE-10136-v0.patch
>
>
> Expected behavior:
> With the introduction of the table-lock, a user can issue a request for a
> snapshot of a table while that table is undergoing an online schema change
> and expect that snapshot request to complete correctly. Also, the same is
> true if a user issues a online schema change request while a snapshot attempt
> is ongoing.
> Observed behavior:
> Snapshot attempts time out when there is an ongoing online schema change
> because the table lock is not acquired by anyone else and the regions are
> closed and opened during the snapshot.
> TableEventHandler trace
> {code}
> // 1. client.addColumn() call from client...
> // 2. The operation is now on the master
> 2013-12-12 12:09:57,613 DEBUG [MASTER] lock.ZKInterProcessLockBase: Acquired
> a lock for /hbase/table-lock/TestTable/write-master:452010000000001
> 2013-12-12 12:09:57,640 INFO [MASTER] handler.TableEventHandler: Handling
> table operation C_M_ADD_FAMILY on table TestTable
> 2013-12-12 12:09:57,685 INFO [MASTER] master.MasterFileSystem: AddColumn.
> Table = TestTable HCD = {NAME => 'x-1386850197327', DATA_BLOCK_ENCODING =>
> 'NONE',$
> 2013-12-12 12:09:57,693 INFO [MASTER] handler.TableEventHandler: Bucketing
> regions by region server...
> ...
> 2013-12-12 12:09:57,771 INFO [MASTER] handler.TableEventHandler: Completed
> table operation C_M_ADD_FAMILY on table TestTable
> 2013-12-12 12:09:57,771 DEBUG [MASTER] master.AssignmentManager: Starting
> unassign of TestTable,,1386849056038.854b280$
> 2013-12-12 12:09:57,772 DEBUG [MASTER] lock.ZKInterProcessLockBase: Released
> /hbase/table-lock/TestTable/write-master:452010000000001
> // 3. The Table*Handler operation is now completed, and the client notified
> with "I'm done!"
> // 4. Now the BulkReopen is starting doing the reopen
> 2013-12-12 12:09:57,772 INFO [MASTER] master.RegionStates: Transitioned
> {854b280006aec464083778a5cb5f5456 state=OPEN,$
> {code}
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