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https://issues.apache.org/jira/browse/MAPREDUCE-1829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876742#action_12876742
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Scott Chen commented on MAPREDUCE-1829:
---------------------------------------
The tests failed because of class not found exception.
For example, java.lang.NoClassDefFoundError:
org/apache/hadoop/security/RefreshUserToGroupMappingsProtocol
I do not know why this happened.
I have manually run the test, TestSpeculativeExecution which covers this code
path and it succeed.
{code}
Testsuite: org.apache.hadoop.mapred.TestSpeculativeExecution
Tests run: 5, Failures: 0, Errors: 0, Time elapsed: 39.893 sec
{code}
There is no unit test included because the code path is been tested by the
existing TestSpeculativeExecution.
I am submitting this to Hudson again.
> JobInProgress.findSpeculativeTask should use min() to find the candidate
> instead of sort()
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1829
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1829
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1829.txt
>
>
> findSpeculativeTask needs only one candidate to speculate so it does not need
> to sort the whole list. It may looks OK but someone can still submit big jobs
> with small slow task thresholds. In this case, this sorting becomes expensive.
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