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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Trinh, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I am using OpenStack Queens release on Ubuntu setup.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Arvind.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Trinh Nguyen <dangtrinhnt@gmail.com>
<br>
<b>Sent:</b> 26 April 2019 07:31<br>
<b>To:</b> Arvind Kumar <Arvind.Kumar@ril.com><br>
<b>Cc:</b> openstack-discuss@lists.openstack.org<br>
<b>Subject:</b> [External]Re: [Ceilometer]: cpu_util meter not being calculated as expected leading to delay in scaling<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Hi Arvind,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Could you please tell us which release of Ceilometer that you are referring to?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Bests,<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Apr 24, 2019 at 4:55 PM Arvind Kumar <<a href="mailto:Arvind.Kumar@ril.com">Arvind.Kumar@ril.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">A design issue is observed in ceilometer service of Openstack. Setup include multiple compute nodes and 3 controller nodes. Meters from each compute node are sent to all the 3 ceilometer
instances via RabbitMQ in round robin fashion at an interval of 10 min. After transformation of cumulative cpu meter data, cpu_util is generated by ceilometer instance at controller node and is published to the http address configured in ceilometer pipeline
configuration. cpu_util is used by the application to take the decision if scaling of VM needs to be triggered or not.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ceilometer instance calculates cpu_util for a VM from the difference between cumulative cpu usage of VM at two timestamp divided by the timestamp difference. Let’s say 1 compute
node send the cumulative cpu usage of a VM (C1, C2, C3, C4) at timestamp T1, T2, T3, T4 (difference between any two timestamp is 10 min). Now (C1,T1) & (C4,T4) tuple is received by ceilometer instance 1, (C2,T2) by instance 2, (C3,T3) by instance 3. Here even
if CPU usage of VM is increased between T1 & T2, cpu_util is calculated for 30 min duration (T1 & T4) rather than as expected for 10 min. This leads to scaling getting triggered after T4 that too when CPU usage is consistently above the threshold between T1
and T4.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Please suggest how could this issue could be resolved. Do we have any solution to bind VM or compute node meter data to specific ceilometer instance for processing?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Arvind.<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:#333333">Trinh Nguyen</span></b><o:p></o:p></p>
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<p class="MsoNormal"><u><span style="font-size:9.5pt;color:black"><a href="https://www.edlab.xyz" target="_blank">www.edlab.xyz</a></span></u><o:p></o:p></p>
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