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https://issues.apache.org/jira/browse/HADOOP-2175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amar Kamat updated HADOOP-2175:
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Attachment: HADOOP-2175-v1.patch
Attaching a patch that marks blacklisted trackers as lost. Since {{FAILED}} and
{{KILLED}} tasks have associated counts, this patch ignores these tasks.
{{RUNNING}} and {{SUCCEEDED}} tasks are re-scheduled. If a task is {{FAILED}}
its still considered {{FAILED}} because
1) There are counts associated with it and is used for killing a {{TIP}}
2) Changing the state causes inconsistency between the failed-task counts and
actual number of failed-tasks.
> Blacklisted hosts may not be able to serve map outputs
> ------------------------------------------------------
>
> Key: HADOOP-2175
> URL: https://issues.apache.org/jira/browse/HADOOP-2175
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Reporter: Runping Qi
> Assignee: Amar Kamat
> Attachments: HADOOP-2175-v1.patch
>
>
> After a node fails 4 mappers (tasks), it is added to blacklist thus it will
> no longer accept tasks.
> But, it will continue serve the map outputs of any mappers that ran
> successfully there.
> However, the node may not be able serve the map outputs either.
> This will cause the reducers to mark the corresponding map outputs as from
> slow hosts,
> but continue to try to get the map outputs from that node.
> This may lead to waiting forever.
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