transaction commit is a sync operation... if an async send in a transaction
fails, then the commit will rollback via: rollbackOnlyOnAsyncException

w.r.t spikes in send, have you enabled the preallocation strategy on
kahadb, it may be worth toggling to see the effect in your env. Also,
ackCompaction may be in the way. To get to the bottom of it would need some
thread dumps or profiling... but those are the big events that effect io.

On Mon, 12 Feb 2018 at 05:51 alprausch77 <> wrote:

> Hello Tim.
> Thank you for your suggestion but I already checked the GC (forgot to
> mention it).
> The times of the slow JMS sends doesn´t correlate with the garbage
> collector
> events.
> Btw: we use CMS as collector.
> Any other ideas?
> Thanks.
> Joachim
> --
> Sent from:

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