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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