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Posted to dev@zookeeper.apache.org by "Hongchao Deng (JIRA)" <ji...@apache.org> on 2014/07/21 00:28:38 UTC

[jira] [Created] (ZOOKEEPER-1978) Fix AT_OPERATION_SEQUENCE_ON_CONCURRENT_ABSTRACTION

Hongchao Deng created ZOOKEEPER-1978:
----------------------------------------

             Summary: Fix AT_OPERATION_SEQUENCE_ON_CONCURRENT_ABSTRACTION
                 Key: ZOOKEEPER-1978
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1978
             Project: ZooKeeper
          Issue Type: Sub-task
            Reporter: Hongchao Deng
            Assignee: Hongchao Deng
            Priority: Minor


findbugs is complaining
{code}
 if (sessionsById.get(id) == null) {
             SessionImpl s = new SessionImpl(id, sessionTimeout);
             sessionsById.put(id, s);
}
{code}
is not atomic for the gap between get() and put().

I suggest using putIfAbsent() instead.



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