Benoy Antony created HADOOP-10852:
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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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