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From "Bibin A Chundatt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7073) Optimize TokenCache#obtainTokensForNamenodesInternal
Date Mon, 09 Apr 2018 09:38:00 GMT
Bibin A Chundatt created MAPREDUCE-7073:
-------------------------------------------

             Summary: 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


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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