Tao Li created HIVE-16979:
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Summary: Cache UGI for metastore
Key: HIVE-16979
URL: https://issues.apache.org/jira/browse/HIVE-16979
Project: Hive
Issue Type: Improvement
Reporter: Tao Li
FileSystem.closeAllForUGI is called per request against metastore to dispose
UGI, which involves talking to HDFS name node and is time consuming. So the
perf improvement would be caching and reusing the UGI.
Per FileSystem.closeAllForUG call could take up to 20 ms as E2E latency against
HDFS. Usually a Hive query could result in several calls against metastore, so
we can save up to 50-100 ms per hive query.
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