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Posted to common-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2016/03/01 00:17:18 UTC
[jira] [Updated] (HADOOP-12858) Reduce UGI getGroups overhead
[ https://issues.apache.org/jira/browse/HADOOP-12858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp updated HADOOP-12858:
---------------------------------
Attachment: HADOOP-12858.patch
Pushed all the group list massaging into the groups cache loader instead of being performed for every group lookup. Also eliminates need for double conversion from a list to array and back to test for group membership.
Part of a larger set of internal 2.7 performance patches. Subsequent hdfs change will require this patch.
> Reduce UGI getGroups overhead
> -----------------------------
>
> Key: HADOOP-12858
> URL: https://issues.apache.org/jira/browse/HADOOP-12858
> Project: Hadoop Common
> Issue Type: Improvement
> Components: performance
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-12858.patch
>
>
> Group lookup generates excessive garbage with multiple conversions between collections and arrays.
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