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https://issues.apache.org/jira/browse/HBASE-4739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150290#comment-13150290
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gaojinchao commented on HBASE-4739:
-----------------------------------
In fact, I made another patch that is more complicated and is not compatible,
so I didn't commit.
another patch step:
1. Hmaster creater a zk node(M_ZK_REGION_PENDING_CLOSE) and set RIT to
pendingclose state
2. send rpc to RS
3. RS change zk node to RS_ZK_REGION_CLOSING
4. Master changes RIT to closing
if above steps, We can distinguish the state of RIT. if
M_ZK_REGION_PENDING_CLOSE we can send a rpc. RS_ZK_REGION_CLOSING we can add to
RIT.
> Master dying while going to close a region can leave it in transition forever
> -----------------------------------------------------------------------------
>
> Key: HBASE-4739
> URL: https://issues.apache.org/jira/browse/HBASE-4739
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.4
> Reporter: Jean-Daniel Cryans
> Assignee: gaojinchao
> Priority: Minor
> Fix For: 0.92.0, 0.94.0, 0.90.5
>
> Attachments: HBASE-4739_Trunk.patch, HBASE-4739_Trunk_V2.patch
>
>
> I saw this in the aftermath of HBASE-4729 on a 0.92 refreshed yesterday, when
> the master died it had just created the RIT znode for a region but didn't
> tell the RS to close it yet.
> When the master restarted it saw the znode and started printing this:
> {quote}
> 2011-11-03 00:02:49,130 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Regions in transition timed
> out: TestTable,0007560564,1320253568406.f76899564cabe7e9857c3aeb526ec9dc.
> state=CLOSING, ts=1320253605285, server=sv4r11s38,62003,1320195046948
> 2011-11-03 00:02:49,130 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Region has been CLOSING for
> too long, this should eventually complete or the server will expire, doing
> nothing
> {quote}
> It's never going to happen, and it's blocking balancing.
> I'm marking this as minor since I believe this situation is pretty rare
> unless you hit other bugs while trying out stuff to root bugs out.
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