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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2175) Blacklisted hosts may not be able to serve map outputs
Date Tue, 25 Mar 2008 10:37:25 GMT

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

Amar Kamat updated HADOOP-2175:
-------------------------------

    Fix Version/s: 0.17.0
      Description: 
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.


  was:

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.



> 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
>             Fix For: 0.17.0
>
>         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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