[ https://issues.apache.org/jira/browse/HIVE-16979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tao Li updated HIVE-16979: -------------------------- Status: Patch Available (was: Open) > Cache UGI for metastore > ----------------------- > > Key: HIVE-16979 > URL: https://issues.apache.org/jira/browse/HIVE-16979 > Project: Hive > Issue Type: Improvement > Reporter: Tao Li > Assignee: Tao Li > Attachments: HIVE-16979.1.patch, HIVE-16979.2.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)