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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2011/02/27 05:19:58 UTC
[jira] Commented: (MAPREDUCE-2198) Allow FairScheduler to control
the number of slots on each TaskTracker
[ https://issues.apache.org/jira/browse/MAPREDUCE-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999876#comment-12999876 ]
Hadoop QA commented on MAPREDUCE-2198:
--------------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12464776/MAPREDUCE-2198-v2.txt
against trunk revision 1074251.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
-1 javac. The patch appears to cause tar ant target to fail.
+1 findbugs. The patch does not introduce any new Findbugs (version 1.3.9) warnings.
+1 release audit. The applied patch does not increase the total number of release audit warnings.
+1 core tests. The patch passed core unit tests.
-1 contrib tests. The patch failed contrib unit tests.
+1 system test framework. The patch passed system test framework compile.
Test results: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/51//testReport/
Findbugs warnings: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/51//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/51//console
This message is automatically generated.
> Allow FairScheduler to control the number of slots on each TaskTracker
> ----------------------------------------------------------------------
>
> Key: MAPREDUCE-2198
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2198
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: contrib/fair-share
> Affects Versions: 0.23.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2198-v2.txt, MAPREDUCE-2198.txt
>
>
> We can set the number of slots on the TaskTracker to be high and let FairScheduler handles the slots.
> This approach allows us to change the number of slots on each node dynamically.
> The administrator can change the number of slots with a CLI tool.
> One use case of this is for upgrading the MapReduce.
> Instead of restarting the cluster, we can run the new MapReduce on the same cluster.
> And use the CLI tool to gradually migrate the slots.
> This way we don't lost the progress fo the jobs that's already executed.
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