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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3890) Scheduled tasks in distributed log splitting not in sync with ZK
Date Wed, 16 Jan 2013 04:02:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13554722#comment-13554722
] 

Hadoop QA commented on HBASE-3890:
----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12565064/hbase-3890.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:red}-1 patch{color}.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/4040//console

This message is automatically generated.
                
> Scheduled tasks in distributed log splitting not in sync with ZK
> ----------------------------------------------------------------
>
>                 Key: HBASE-3890
>                 URL: https://issues.apache.org/jira/browse/HBASE-3890
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Lars George
>            Assignee: Jeffrey Zhong
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: hbase-3890.patch
>
>
> This is in continuation to HBASE-3889:
> Note that there must be more slightly off here. Although the splitlogs znode is now empty
the master is still stuck here:
> {noformat}
> Doing distributed log split in hdfs://localhost:8020/hbase/.logs/10.0.0.65,60020,1305406356765

> - Waiting for distributed tasks to finish. scheduled=2 done=1 error=0   4380s
> Master startup	
> - Splitting logs after master startup   4388s
> {noformat}
> There seems to be an issue with what is in ZK and what the TaskBatch holds. In my case
it could be related to the fact that the task was already in ZK after many faulty restarts
because of the NPE. Maybe it was added once (since that is keyed by path, and that is unique
on my machine), but the reference count upped twice? Now that the real one is done, the done
counter has been increased, but will never match the scheduled.
> The code could also check if ZK is actually depleted, and therefore treat the scheduled
task as bogus? This of course only treats the symptom, not the root cause of this condition.


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