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It seems to be periodic thread which is checking when buffer with data should be written to HornetQ journal. I think the logic here is pretty standard. If buffer is full then write buffer to journal immediately. If buffer is not full then then wait hornetq-buffer-timeout and then write buffer to journal.
Yes, it is periodic thread. I wonder why it's shown as blocked. Is there any chance of bottleneck due to this. Found only one thread like this.
I think, this is by design but of course it depends where it waits.