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Hi Yuan,

please compare similar issue described in this bug report [1] and the corresponding fix [2].
As Craig explained in his comment to patch set 4, Kafka server closes idle connections after around 10 minutes, which causes first write to the topic fail.

I hope it helps.
Witek

[1] https://storyboard.openstack.org/#!/story/2001386
[2] https://review.openstack.org/525669


From: Yuan.Pen at t-systems.com [mailto:Yuan.Pen at t-systems.com]
Sent: Freitag, 12. Januar 2018 19:36
To: roland.hochmuth at hpe.com
Cc: Bedyk, Witold <witold.bedyk at est.fujitsu.com>; monasca at lists.launchpad.net; Trebski, Tomasz <Tomasz.Trebski at ts.fujitsu.com>; bradley.klein at charter.com
Subject: alarm transition events are missing in kafka queue - mysql alarm state is updated properly

Hi Roland,
This is Yuan Pen from Deutsche Telekom. I am sending this email to the monasca community asking for help on monasca threshold engine. We have found that when sometime alarm state transitions happened, the threshold engine updated mysql alarm state properly, but failed to put  state transition events  in kafka queue (alarm-state-transitions).  Does this ring a bell to anyone in the community? If this is a real problem, is there anything we can do to make sure the event in transition queue and state in mysql is synched? Any comments or help are greatly appreciated.
Best Regard,

Yuan Pen

571-594-6155

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