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Posted to common-dev@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2007/10/20 09:01:53 UTC
[jira] Commented: (HADOOP-2079) [hbase] HLog generates incorrect
file name when splitting a log, race condition also contributes
[ 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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