Timothy Bish created AMQ-3982:
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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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