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https://issues.apache.org/jira/browse/HADOOP-13442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15408011#comment-15408011
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Hudson commented on HADOOP-13442:
---------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #10215 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10215/])
HADOOP-13442. Optimize UGI group lookups. Contributed by Daryn Sharp. (kihwal:
rev 94225152399e6e89fa7b4cff6d17d33e544329a3)
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/SecureIOUtils.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/authorize/AccessControlList.java
*
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/TestUserGroupInformation.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFs.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/Groups.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
> 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-alpha2
>
> 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.
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