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https://issues.apache.org/jira/browse/HADOOP-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476242
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David Bowen commented on HADOOP-1042:
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A small point: in lines like this:
Map<Integer, MapOutputLocation> knownOutputs = new HashMap();
it would be preferable (avoid a warning) to specify the types on the right hand
side, like this:
Map<Integer,MapOutputLocation> knownOutputs = new
HashMap<Integer,MapOutputLocation>();
> Improve the handling of failed map output fetches
> -------------------------------------------------
>
> Key: HADOOP-1042
> URL: https://issues.apache.org/jira/browse/HADOOP-1042
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.11.2
> Reporter: Devaraj Das
> Assigned To: Devaraj Das
> Attachments: 1042.patch
>
>
> Currently, whenever fetch of a map output fails the corresponding
> MapOutputLocation is added to a List datastructure for later retrial. But, if
> the failure was due to a lost task, the entry that was added is not deleted.
> For such cases, unnecessary retrials will happen. This situation should be
> prevented.
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