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https://issues.apache.org/jira/browse/MAPREDUCE-7309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17236497#comment-17236497
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Wangda Tan commented on MAPREDUCE-7309:
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Attached ver.2 patch, [~snemeth], [~shuzirra] can you help to review it?
> Improve performance of reading resource request for mapper/reducers from
> config
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-7309
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7309
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster
> Affects Versions: 3.0.0, 3.1.0, 3.2.0, 3.3.0
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Priority: Major
> Attachments: MAPREDUCE-7309.001.patch, MAPREDUCE-7309.002.patch
>
>
> This is an issue could affect all the releases which includes YARN-6927.
> Basically, we use regex match repeatly when we read mapper/reducer resource
> request from config files. When we have large config file, and large number
> of splits, it could take a long time.
> We saw AM could take hours to parse config when we have 200k+ splits, with a
> large config file (hundreds of kbs).
> We should do proper caching for pre-configured resource requests.
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