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From "Benoy Antony (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-10852) NetgroupCache is not thread-safe
Date Wed, 16 Jul 2014 19:22:04 GMT
Benoy Antony created HADOOP-10852:

             Summary: 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: 2.4.1
            Reporter: Benoy Antony
            Assignee: Benoy Antony

_NetgroupCache_ internally uses two _ConcurrentHashMap_s and a boolean variable to signal
updates on one of the _ConcurrentHashMap_s 
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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