Bibin A Chundatt created MAPREDUCE-7073:
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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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