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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