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https://issues.apache.org/jira/browse/MAPREDUCE-1199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775360#action_12775360
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Amar Kamat commented on MAPREDUCE-1199:
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Consider an example where the cluster has 3 tasktrackers (t1,t2 and t3) and a
tip tip1 runs on t1 and fails. Now the tip1 is rescheduled on t2 and fails
again. Now if tracker t1 is blacklisted, then t1 will be removed from the
active tracker list. Now if tracker t2 asks for a task, tip1 will be scheduled
on it as the total count of active tracker = 2 (t2, t3) and total-tip-failures
= 2 (t1, t2) is same.
> TaskInProgress should also consider blacklisted node while (re)scheduling
> failed tasks
> --------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1199
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1199
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Amar Kamat
>
> While rescheduling failed tasks, only the failure count is used. It should
> also consider the blacklisted trackers information too.
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