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Date: Tue, 15 Nov 2011 07:49:51 +0000 (UTC)
From: "gaojinchao (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4739) Master dying while going to close a
 region can leave it in transition forever
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    [ https://issues.apache.org/jira/browse/HBASE-4739?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1315=
0290#comment-13150290 ]=20

gaojinchao commented on HBASE-4739:
-----------------------------------

In fact, I made =E2=80=8B=E2=80=8Banother patch that is more complicated an=
d 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 pend=
ingclose 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.


               =20
> Master dying while going to close a region can leave it in transition for=
ever
> -------------------------------------------------------------------------=
----
>
>                 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 did=
n'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.AssignmentMan=
ager: Regions in transition timed out:  TestTable,0007560564,1320253568406.=
f76899564cabe7e9857c3aeb526ec9dc. state=3DCLOSING, ts=3D1320253605285, serv=
er=3Dsv4r11s38,62003,1320195046948
> 2011-11-03 00:02:49,130 INFO org.apache.hadoop.hbase.master.AssignmentMan=
ager: 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 u=
nless you hit other bugs while trying out stuff to root bugs out.

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