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From "Rob Davies (JIRA)" <>
Subject [jira] Assigned: (AMQ-1479) AMQ Store deletes data files which are in use
Date Sat, 27 Oct 2007 10:46:23 GMT


Rob Davies reassigned AMQ-1479:

    Assignee: Rob Davies  (was: Hiram Chirino)

> AMQ Store deletes data files which are in use
> ---------------------------------------------
>                 Key: AMQ-1479
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.0.0
>            Reporter: Rob Davies
>            Assignee: Rob Davies
>            Priority: Blocker
>             Fix For: 5.0.0
> The AMQ Store allocates entries in the data logs for commands (including messages/acknowledgements/transaction
boundaries etc) - but relies on the reference store for keeping track of data files that are
being used. Updates to the reference store happen at a checkpoint() - asynchronously. The
problem is that for a fast producer, the current data file (one being written to) can move
on past the last known data file to the reference store. As the cleanup() task is a scheduled
task - and not coupled to check points - the cleanup task can remove data files that the reference
store is not yet aware of AND have are previous to the current data file being written too.

> This issue can result in errors from the AMQ Store such as:
> Message: Failed to read to journal for: offset = 
> 2374, file = 1, size = -1, type = 0. Reason: Could 
> not locate data file data--1 
> see:
> Test case: org.apache.activemq.bugs.DurableConsumerTest

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