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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3982) Overlapping PList iterators can read wrong data or throw exceptions about chunk streams not existing.
Date Mon, 20 Aug 2012 15:19:38 GMT
Timothy Bish created AMQ-3982:
---------------------------------

             Summary: Overlapping PList iterators can read wrong data or throw exceptions
about chunk streams not existing.
                 Key: AMQ-3982
                 URL: https://issues.apache.org/jira/browse/AMQ-3982
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.6.0
            Reporter: Timothy Bish
            Assignee: Timothy Bish
            Priority: Critical
             Fix For: 5.7.0


When multiple PList iterators are in use and happen have an overlapping read of PageFile data
on disk they can reset each others seek offset and cause an exception to be thrown about "chunk
stream does not exist" or read of a page in the Free list.  The reason is that the hasNext
of PList iterator needs to by sync'd on the index lock to prevent two iterators from entering
into a readPage call concurrently.  

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