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From "Bibin A Chundatt (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-7073) Optimize TokenCache#obtainTokensForNamenodesInternal
Date Mon, 09 Apr 2018 09:45:00 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bibin A Chundatt updated MAPREDUCE-7073:
----------------------------------------
    Status: Patch Available  (was: Open)

> 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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