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https://issues.apache.org/jira/browse/HDFS-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614730#comment-13614730
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Aaron T. Myers commented on HDFS-4640:
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Seems like we should move this JIRA to Common, no? The groups mapping stuff is
used by YARN as well, and none of these changes are HDFS-specific.
> JniBasedUnixGroupsMapping: fix some crash bugs
> ----------------------------------------------
>
> Key: HDFS-4640
> URL: https://issues.apache.org/jira/browse/HDFS-4640
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: security
> Affects Versions: 2.0.5-beta
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-4640.002.patch
>
>
> JniBasedUnixGroupsMapping has some issues.
> * sometimes on error paths variables are freed prior to being initialized
> * re-allocate buffers less frequently (can reuse the same buffer for multiple
> calls to getgrnam)
> * allow non-reentrant functions to be used, to work around client bugs
> * don't throw IOException from JNI functions if the JNI functions do not
> declare this checked exception.
> * don't bail out if only one group name among all the ones associated with a
> user can't be looked up.
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