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https://issues.apache.org/jira/browse/MAPREDUCE-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16430324#comment-16430324
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Bibin A Chundatt commented on MAPREDUCE-7073:
---------------------------------------------
Issue credits to [~lindongdong]
> Optimize TokenCache#obtainTokensForNamenodesInternal
> ----------------------------------------------------
>
> Key: MAPREDUCE-7073
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7073
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Bibin A Chundatt
> Assignee: Bibin A Chundatt
> Priority: Major
> Attachments: MAPREDUCE-7073.001.patch
>
>
> {{FileInputFormat#listStatus}} is too slow file system cache is disabled.
> {{TokenCache#obtainTokensForNamenodesInternal}} for every filesystem instance
> {{Master.getMasterPrincipal(conf)}} is caled which reloads YarnConfiguration .
> For fileInput with 1k file will reload YarnConfiguration 1k times.
> {{Master.getMasterPrincipal(conf)}} can be passed for
> {{obtainTokensForNamenodesInternal}} per filesystem call.
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