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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-108) Blacklisted hosts may not be able to serve map outputs
Date Thu, 17 Jul 2014 18:25:06 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Allen Wittenauer resolved MAPREDUCE-108.
----------------------------------------

    Resolution: Incomplete

I'm going to close this out as stale.  Blacklisting has undergone quite a few changes in the
past 6-7 years.

> Blacklisted hosts may not be able to serve map outputs
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-108
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-108
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Runping Qi
>            Assignee: Amar Kamat
>         Attachments: HADOOP-2175-v1.1.patch, HADOOP-2175-v1.patch, HADOOP-2175-v2.patch,
HADOOP-2175-v2.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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