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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CHUKWA-743) race condition in PidFile
Date Sat, 18 Apr 2015 05:16:01 GMT

     [ https://issues.apache.org/jira/browse/CHUKWA-743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eric Yang updated CHUKWA-743:
-----------------------------
    Resolution: Fixed
      Assignee: Eric Yang
        Status: Resolved  (was: Patch Available)

I just committed this.

> race condition in PidFile
> -------------------------
>
>                 Key: CHUKWA-743
>                 URL: https://issues.apache.org/jira/browse/CHUKWA-743
>             Project: Chukwa
>          Issue Type: Bug
>            Reporter: Alan Snyder
>            Assignee: Eric Yang
>         Attachments: CHUKWA-743.patch
>
>
> 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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