[ https://issues.apache.org/jira/browse/HADOOP-13442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Konstantin Shvachko updated HADOOP-13442: ----------------------------------------- Fix Version/s: 2.7.5 Just committed along with broken tests HDFS-10738 and MAPREDUCE-6750 to branch-2.7. Thank you Daryn. Updating Fix Version for all three. > Optimize UGI group lookups > -------------------------- > > Key: HADOOP-13442 > URL: https://issues.apache.org/jira/browse/HADOOP-13442 > Project: Hadoop Common > Issue Type: Improvement > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Fix For: 2.8.0, 3.0.0-alpha1, 2.7.5 > > Attachments: HADOOP-13442.patch > > > {{UGI#getGroups}} and its usage is inefficient. The list is unnecessarily > converted to multiple collections. > For _every_ invocation, the {{List<String>}} from the group provider is > converted into a {{LinkedHashSet<String>}} (to de-dup), back to a > {{String[]}}. Then callers testing for group membership convert back to a > {{List<String>}}. This should be done once to reduce allocations. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org