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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2175) Blacklisted hosts may not be able to serve map outputs
Date Thu, 08 Nov 2007 23:26:50 GMT
Blacklisted hosts may not be able to serve map outputs
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                 Key: HADOOP-2175
                 URL: https://issues.apache.org/jira/browse/HADOOP-2175
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
            Reporter: Runping Qi



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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