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AMQ-9625 - Prevent queue messages from becoming stuck - #1355
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I updated the PR slightly as we needed the check/wait for the async to be done not only when the store is being synced, but also for any outstanding in flight async messages that were in progress by other threads when the mode switched. |
Fixes a race condition bug that can lead to a message being missed on dispatch and stuck on a Queue until restart when caching and concurrentStoreAndDispatch are enabled on a Queue and the cache becomes disabled.
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I'm going to go ahead and merge this as it is low risk (we are just waiting on the pending writes so messages become sync) and it's nearly impossible to write a test case for it. In my testing it has shown some promising results but if the issue re-occurs another Jira can be opened as a follow up. |
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Fixes a race condition bug that can lead to a message being missed on dispatch and stuck on a Queue until restart when caching and concurrentStoreAndDispatch are enabled on a Queue and the cache becomes disabled.
This is pretty much impossible to reproduce or test in a unit test so there's no test for this but the risk of breaking anything is very low because all this is doing is just waiting for the future to complete to ensure the task finishes before we continue.
For a detailed description of the problem see https://issues.apache.org/jira/browse/AMQ-9625