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From "Kevin Yaussy (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1663) Problem in Kaha persistence with file name lengths and collisions during persistence
Date Mon, 14 Apr 2008 13:24:43 GMT
Problem in Kaha persistence with file name lengths and collisions during persistence
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                 Key: AMQ-1663
                 URL: https://issues.apache.org/activemq/browse/AMQ-1663
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.1.0
         Environment: Solaris 10, JDK 1.6
            Reporter: Kevin Yaussy
            Priority: Blocker


The management of file names within Kaha persistence is such that it may create a file with
a name that ends up colliding with a file meant for a different, but very close, topic name.
 The file names are ultimately managed by org/apache/activemq/util/IOHelper.java, which will
trim the file name down to a maximum file name size, default of 64.  With sufficiently large
topic names, it is possible to create a collision with this scheme.  Ours is large enough,
that even if I push the max to 200 (attempting to stay under the 256 max length in Solaris),
I can still get a collision.

What this results in is modifications to a file for two different items and/or consumers,
which causes corruption and errors.


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