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https://issues.apache.org/jira/browse/MAPREDUCE-1317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792441#action_12792441
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Hong Tang commented on MAPREDUCE-1317:
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Through YourKit profiling, we found two places where we could save memory:
- LoggedLocation - we should share references to the same LoggedLocation for
the same preferred location for different map tasks.
- LoggedTaskAttempt.hostName - we should keep a cache of all host names for the
cluster and share the references.
> Reducing memory consumption of rumen objects
> --------------------------------------------
>
> Key: MAPREDUCE-1317
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1317
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Hong Tang
>
> We have encountered OutOfMemoryErrors in mumak and gridmix when dealing with
> very large jobs. The purpose of this jira is to optimze memory consumption of
> rumen produced job objects.
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