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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Work started: (HADOOP-2175) Blacklisted hosts may not be able to serve map outputs
Date Fri, 14 Mar 2008 05:19:24 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Work on HADOOP-2175 started by Amar Kamat.

> 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
> 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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