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Posted to dev@chukwa.apache.org by "Alan Snyder (JIRA)" <ji...@apache.org> on 2015/04/04 03:42:33 UTC

[jira] [Created] (CHUKWA-743) race condition in PidFile

Alan Snyder created CHUKWA-743:
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             Summary: race condition in PidFile
                 Key: CHUKWA-743
                 URL: https://issues.apache.org/jira/browse/CHUKWA-743
             Project: Chukwa
          Issue Type: Bug
            Reporter: Alan Snyder


I believe there is a race condition in org.apache.hadoop.chukwa.util.PidFile. The problem is that the creation and deletion of the file is not protected by any lock. Client A can delete the file just before Client B tries to acquire a lock. If at that moment Client C tries to create the file, it will succeed. Client B and Client C will both succeed in acquiring a lock because there are two different files (one is hidden because it was deleted after being opened). I have tested similar code on OS X and this is what happened.



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