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https://issues.apache.org/jira/browse/TEZ-1940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siddharth Seth resolved TEZ-1940.
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Resolution: Duplicate
> Change OrderedGroupedFetcher to work with a ThreadPool and Callables
> --------------------------------------------------------------------
>
> Key: TEZ-1940
> URL: https://issues.apache.org/jira/browse/TEZ-1940
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Siddharth Seth
>
> Currently OrderedGroupedShuffle creates N threads up front - each of which
> waits for events. This needs to move to a model where the fetchers can run
> off a threadpool instead of having the fetchers permanently take up a thread.
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