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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8545) Meta stuck in transition when it is assigned to a just restarted dead region sever
Date Thu, 16 May 2013 22:01:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660056#comment-13660056
] 

Hadoop QA commented on HBASE-8545:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12583540/trunk-8545_v2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 6 new or modified
tests.

    {color:green}+1 hadoop1.0{color}.  The patch compiles against the hadoop 1.0 profile.

    {color:green}+1 hadoop2.0{color}.  The patch compiles against the hadoop 2.0 profile.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.master.TestTableLockManager

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/5726//console

This message is automatically generated.
                
> Meta stuck in transition when it is assigned to a just restarted dead region sever 
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-8545
>                 URL: https://issues.apache.org/jira/browse/HBASE-8545
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>         Attachments: trunk-8545.patch, trunk-8545_v2.patch
>
>
> Support the meta region server is down, and the SSH tries to re-assign it.  This could
happen:
> 1. AM plans to assign meta to a region server (R_old);
> 2. Now R_old is dead, the new region server (R_new) starts up on the same host, port,
but gets a different start code;
> 3. AM sends the open region request to R_new and the Meta is opened on it;
> 4. AM gets ZK event, but it is from a different region server instance (R_new), not the
expected one (R_old), so it sends a close region request to R_new;
> 5. Now, the meta is stuck in transition and won't be assigned.
> This won't happen to a user region since the SSH for R_old will find out the user region
stuck in transition and re-assign it.  For meta, it is a little different.  AM checks if a
dead region server carries the meta based on the ZK info, which is changed to the new region
server R_new at step 3 by the open region handler.
> The fix I was thinking about is:
> 1. In checking if a region server carries a region, uses the region transition information
if it exists (which is the source of truth, to master), if not, checks the ZK data as before;
> 2. In open region handler, when transition assign zk node from offline to opening, make
sure the current region server is the expected one (ZK#transitionNode, existing code doesn't
check the target server name).

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