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https://issues.apache.org/jira/browse/HADOOP-5337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694193#action_12694193
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Amar Kamat commented on HADOOP-5337:
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{{TestDatanodeBlockScanner}}, {{TestBackupNode}} and {{TestCapacityScheduler}}
failed. Investigating.
> JobTracker greedily schedules tasks without running tasks to join
> -----------------------------------------------------------------
>
> Key: HADOOP-5337
> URL: https://issues.apache.org/jira/browse/HADOOP-5337
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.20.0
> Reporter: Karam Singh
> Assignee: Amar Kamat
> Attachments: HADOOP-5337-v1.11.patch, HADOOP-5337-v1.12.patch,
> HADOOP-5337-v1.7.patch, HADOOP-5337-v1.9.patch
>
>
> This issue was observed when JobTracker was restarted 3 times and observed
> that 4 instances of each reduce task were running. This issue is observed
> when cluster is not fully occupied.
> In testcase: Map/reduces capacity is 200/200 slots respectively and Job
> profile is 11000 maps, 10 reduces and speculative execution is off.
> JobTracker was restarted 3 times in small intervals of about 5 mins and after
> recovery, 40 reduce tasks were running. Task details web page
> (taskdetails.jsp) was showing 4 running attempts of each reduce task.
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