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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2079) [hbase] HLog generates incorrect file name when splitting a log, race condition also contributes
Date Sat, 20 Oct 2007 07:01:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536405
] 

Hadoop QA commented on HADOOP-2079:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12368061/patch.txt
against trunk revision r586264.

    @author +1.  The patch does not contain any @author tags.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new compiler warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/974/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/974/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/974/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/974/console

This message is automatically generated.

> [hbase] HLog generates incorrect file name when splitting a log, race  condition also
contributes
> -------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2079
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2079
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Jim Kellerman
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>
>         Attachments: patch.txt
>
>
> In Hadoop-Nightly #277 TestRegionServerExit failed with a timeout.
> The reason for this was a race in the Master in which checkAssigned (run from either
the root or meta scanner)  will immediately try to split the log and then assign a region
which has invalid server info.
> The scenario went something like this:
> 1. region server aborted
> 2. root region was written on optional cache flush
> lease timed out on aborted server which removes it from serversToServerInfo and queues
a PendingServerShutdown operation
> 3. root scanner runs and finds server info incorrect (it is in the root region but the
server is not in serversToServerInfo
> 4. checkAssigned starts splitting the log but because the log name is incorrect it can't
finish
> 5. PendingServerShutdown fires and really gums up the works.
> So there are two problems:
> 1. HLog.splitLog needs to generate the correct log file name.
> 2. PendingServerShutdown and/or leaseExpired need to cooperate with checkAssigned so
that there are not two concurrent attempts to recover the log.

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