The new tell-based protocol in CDS adds internal retries for transactions. It is not the default yet (https://git.opendaylight.org/gerrit/#/c/61002/).
On Wed, Nov 8, 2017 at 3:20 PM, Michael Vorburger <vorbur...@redhat.com> wrote: > Tom and other controllerians, > > While code reviewing https://git.opendaylight.org/gerrit/#/c/61526/ for > https://jira.opendaylight.org/browse/GENIUS-86, I learnt that, apparently > (quote) "in scale testing, there are too many writes and reads over the > network, and sometimes these AskTimeout exceptions occur due to the load, > it is just that for sometime we are not able to reach the other side, but > the nodes are all healthy, and it comes back soon", and wanted to know: > > 1. is this still the case, or is that propose change to master for some > known old problem that was meanwhile fixed in controller CDS infra? > > 2. does it seem right to you that application code handles this? Like > wouldn't it be better if there was some configuration knob somewhere in > controller CDS to increase whatever timeout or retry counter is behind when > these TransactionCommitFailedException caused by > akka.pattern.AskTimeoutException > occur, to tune it to try harder/longer, and not throw any > TransactionCommitFailed? > > 3. when these do occur, is there really a "scenario where even though the > transaction throws a TransactionCommitFailedException (caused by > akka.pattern.AskTimeoutException) it eventually succeeds" ? That's what > in c/61526 is being proposed to be added to the DataBrokerFailures test > utility, to test such logic in application code... in > DataBrokerFailuresImpl, it simulates a submit() that actually did go > through and changed the DS (line 95 super.submit().get()) but then return > immediateFailedCheckedFuture(submitException) anyway. Is that really what > (under this scenario) could happen IRL at prod from CDS? That seems... > weird, curious - so it's transactions are not really (always) > transactionally to be trusted? ;) > > Tx, > M. > -- > Michael Vorburger, Red Hat > vorbur...@redhat.com | IRC: vorburger @freenode | ~ = http://vorburger.ch > > _______________________________________________ > controller-dev mailing list > controller-dev@lists.opendaylight.org > https://lists.opendaylight.org/mailman/listinfo/controller-dev > >
_______________________________________________ controller-dev mailing list controller-dev@lists.opendaylight.org https://lists.opendaylight.org/mailman/listinfo/controller-dev
