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https://issues.apache.org/jira/browse/MAPREDUCE-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bibin A Chundatt updated MAPREDUCE-7073:
----------------------------------------
    Attachment: MAPREDUCE-7073.002.patch

> 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, MAPREDUCE-7073.002.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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