[jira] [Created] (ACCUMULO-2174) VFS Classloader has potential to collide localized resources

["Josh Elser (JIRA)" <ji...@apache.org>]

Josh Elser created ACCUMULO-2174:
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             Summary: VFS Classloader has potential to collide localized resources
                 Key: ACCUMULO-2174
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2174
             Project: Accumulo
          Issue Type: Bug
          Components: start
    Affects Versions: 1.5.0
            Reporter: Josh Elser
            Assignee: Josh Elser
             Fix For: 1.5.1, 1.6.0


Looking through the VFS implementation, a single directory is used for *all* Accumulo processes on a single host for a given user.

Commons-vfs makes some attempt (adds a number to the localized resource, created from a random number between 0 and 2**16, and incremented for each updated resource) to give a "unique" resource. Rather than let this bite us later on, it's rather simple for us to just query the runtime and get the pid of the process to add into the temp directory that a process uses.

This could increase the copies of resources per host (by the number of processes), but I think the performance penalty is much better than suddenly getting someone else's jars in the middle of my process execution.



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