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Asked: 2026-06-15T17:11:56+00:00

I have a distributor and 2 workers, in distributor’s storage queue messages are keep

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I have a distributor and 2 workers, in distributor’s storage queue messages are keep on increasing, each message has size of 2 kb.

I have gone through Udi reply here
http://tech.dir.groups.yahoo.com/group/nservicebus/message/10698
Messages are cleared from the distributor’s storage queue when it dispatches messages to the worker nodes.
That being said, the worker nodes usually send a ready message right afterwards, causing the storage queue to fill up again.

I am not clear about “causing the storage queue to fill up again.” Statement.

I was expecting max messages in distributor’s storage queue should be equal to number of workers but that is not the case.

Is there any configuration that I may be missing to control distributor’s storage queue clean up behavior?

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  1. Editorial Team

    As of NSB 3.3.2 there is an known issue, https://github.com/NServiceBus/NServiceBus/issues/806, with using SendLocal on worker in a distributor scenario. This will lead to the worker sending a “ready for a new message” every time it handles a message sent locally. This makes the distributors storage queue grow above the expected maximum of sum of all worker threads on all workers. This can be a problem if your sending lots of messages locally and the number of entries in the storage queue grows very large.

    Workarounds:

    1. Switch from SendLocal to Send
    2. Restart the workers(this will reset the storage, but it will build up again for every SendLocal on a worker

    There was also a similar issue with SLR(Second Level Retries) functionality( https://github.com/NServiceBus/NServiceBus/issues/571 ), but that was fixed in 3.2.7.

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