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<div>We just use heartbeat. But from what I recall other people have good luck with both set. I would keep them if they are already set , maybe just dial down how aggressive they are. One thing I should mention is that if you have a large number of RPC workers,
enabling heartbeats will increase cpu consumption about 1-2% per worker (in our experience). Since its now doing something with rabbitmq every few seconds. This can also increase load on the rabbitmq side as well. For us having a stable rabbit environment
is well worth the tradeoff.</div>
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<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">Kris Lindgren</span></font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">Senior Linux Systems Engineer</span></font></font></div>
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<span style="font-weight:bold">From: </span>"Ajay Kalambur (akalambu)" <<a href="mailto:akalambu@cisco.com">akalambu@cisco.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 21, 2016 at 1:04 PM<br>
<span style="font-weight:bold">To: </span>"Kris G. Lindgren" <<a href="mailto:klindgren@godaddy.com">klindgren@godaddy.com</a>>, "<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo<br>
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<div>Do you recommend both or can I do away with the system timers and just keep the heartbeat?</div>
<div>Ajay</div>
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<span style="font-weight:bold">From: </span>"Kris G. Lindgren" <<a href="mailto:klindgren@godaddy.com">klindgren@godaddy.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 21, 2016 at 11:54 AM<br>
<span style="font-weight:bold">To: </span>Ajay Kalambur <<a href="mailto:akalambu@cisco.com">akalambu@cisco.com</a>>, "<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo<br>
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<div>Yea, that only fixes part of the issue. The other part is getting the openstack messaging code itself to figure out the connection its using is no longer valid. Heartbeats by itself solved 90%+ of our issues with rabbitmq and nodes being disconnected
and never reconnecting.</div>
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<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri">___________________________________________________________________</font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">Kris Lindgren</span></font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">Senior Linux Systems Engineer</span></font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">GoDaddy</span></font></font></div>
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<span style="font-weight:bold">From: </span>"Ajay Kalambur (akalambu)" <<a href="mailto:akalambu@cisco.com">akalambu@cisco.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 21, 2016 at 12:51 PM<br>
<span style="font-weight:bold">To: </span>"Kris G. Lindgren" <<a href="mailto:klindgren@godaddy.com">klindgren@godaddy.com</a>>, "<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo<br>
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<div>Trying that now. I had aggressive system keepalive timers before</div>
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<div>net.ipv4.tcp_keepalive_intvl = 10</div>
<div>net.ipv4.tcp_keepalive_probes = 9</div>
<div>net.ipv4.tcp_keepalive_time = 5</div>
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<span style="font-weight:bold">From: </span>"Kris G. Lindgren" <<a href="mailto:klindgren@godaddy.com">klindgren@godaddy.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 21, 2016 at 11:50 AM<br>
<span style="font-weight:bold">To: </span>Ajay Kalambur <<a href="mailto:akalambu@cisco.com">akalambu@cisco.com</a>>, "<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [Openstack-operators] [oslo]nova compute reconnection Issue Kilo<br>
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<div>Do you have rabbitmq/oslo messaging heartbeats enabled?</div>
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<div>If you aren't using heartbeats it will take a long time for the nova-compute agent to figure out that its actually no longer attached to anything. Heartbeat does periodic checks against rabbitmq and will catch this state and reconnect. </div>
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<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri">___________________________________________________________________</font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri">Kris Lindgren</font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">Senior Linux Systems Engineer</span></font></font></div>
<div><font class="Apple-style-span" color="#000000"><font class="Apple-style-span" face="Calibri"><span class="Apple-style-span" style="font-size: 14px;">GoDaddy</span></font></font></div>
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<span style="font-weight:bold">From: </span>"Ajay Kalambur (akalambu)" <<a href="mailto:akalambu@cisco.com">akalambu@cisco.com</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, April 21, 2016 at 11:43 AM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>" <<a href="mailto:openstack-operators@lists.openstack.org">openstack-operators@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>[Openstack-operators] [oslo]nova compute reconnection Issue Kilo<br>
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<div>Hi</div>
<div>I am seeing on Kilo if I bring down one contoller node sometimes some computes report down forever.</div>
<div>I need to restart the compute service on compute node to recover. Looks like oslo is not reconnecting in nova-compute</div>
<div>Here is the Trace from nova-compute</div>
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<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 156, in call</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db retry=self.retry)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/transport.py", line 90, in _send</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db timeout=timeout, retry=retry)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 350, in send</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db retry=retry)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 339, in _send</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db result = self._waiter.wait(msg_id, timeout)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 243, in wait</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db message = self.waiters.get(msg_id, timeout=timeout)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db File "/usr/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 149, in get</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db 'to message ID %s' % msg_id)</div>
<div>2016-04-19 20:25:39.090 6 TRACE nova.servicegroup.drivers.db MessagingTimeout: Timed out waiting for a reply to message ID e064b5f6c8244818afdc5e91fff8ebf1</div>
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<div>Any thougths. I am at stable/kilo for oslo</div>
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<div>Ajay</div>
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