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https://issues.apache.org/jira/browse/HADOOP-10852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14248292#comment-14248292
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Hudson commented on HADOOP-10852:
---------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #1975 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1975/])
HADOOP-10852 Fix thread safety issues in NetgroupCache. (Benoy Antony) (benoy:
rev a095622f36c5e9fff3ec02b14b800038a81f6286)
*
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/NetgroupCache.java
> NetgroupCache is not thread-safe
> --------------------------------
>
> Key: HADOOP-10852
> URL: https://issues.apache.org/jira/browse/HADOOP-10852
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Affects Versions: 2.5.0, 2.4.1
> Reporter: Benoy Antony
> Assignee: Benoy Antony
> Fix For: 2.7.0
>
> Attachments: HADOOP-10852.patch, HADOOP-10852.patch,
> HADOOP-10852.patch, HADOOP-10852.patch
>
>
> _NetgroupCache_ internally uses two ConcurrentHashMaps and a boolean variable
> to signal updates on one of the ConcurrentHashMap
> None of the functions are synchronized and hence is possible to have
> unexpected results due to race condition between different threads.
> As an example, consider the following sequence:
> Thread1 :
> {{add}} a group
> {{netgroupToUsersMap}} is updated.
> {{netgroupToUsersMapUpdated}} is set to true.
> Thread 2:
> calls {{getNetgroups}} for a user
> Due to re-ordering, {{netgroupToUsersMapUpdated=true}} is visible, but
> updates in {{netgroupToUsersMap}} is not visible.
> Does a wrong update with older {{netgroupToUsersMap}} values.
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