Since by your account the module hovers at about 8 instances which all get proactively restarted at the same time, this suggests that scaling doesn't happen gradually and that the load on that module is fairly constant.
Keeping a minimum number of idle instances will help with latency spikes when they occur, however you may be better suited to use manual scaling at 8 instances to avoid the proactive restart issue and use the setNumInstances() <https://cloud.google.com/appengine/docs/java/javadoc/com/google/appengine/api/modules/ModulesService#setNumInstances-java.lang.String-java.lang.String-long-> method from the Modules Service to manually scale up or down if the load needs to change. On Tuesday, July 19, 2016 at 7:06:53 AM UTC-4, Iliya Novikov wrote: > > Sure. We use Java, here is the content of appengine-web.xml: > > <instance-class>F2</instance-class> > <automatic-scaling> > <min-idle-instances>0</min-idle-instances> > <max-idle-instances>6</max-idle-instances> > <min-pending-latency>60ms</min-pending-latency> > <max-pending-latency>120ms</max-pending-latency> > </automatic-scaling> > <threadsafe>true</threadsafe> > <warmup-requests-enabled>true</warmup-requests-enabled> > > On Monday, July 18, 2016 at 7:39:25 PM UTC+2, Adam (Cloud Platform > Support) wrote: >> >> Would you mind posting the details from your app.yaml? >> >> On Monday, July 18, 2016 at 11:37:29 AM UTC-4, Iliya Novikov wrote: >>> >>> Thanks for reply, Martin. I checked with the documentation and according >>> to it we have warmup requests configured correctly. Though it reminded me >>> of one thing. I have never seen a warmup request sent to a running App >>> Engine application. I can see them only when I deploy a new version. It >>> seems that none of my instances started by the automatic scaling never gets >>> a warmup request. I guess this is wrong, no? Unfortunately the >>> documentation is vague on this: "App Engine might not issue a warmup >>> request every time your application needs a new instance". >>> >>> On Monday, July 18, 2016 at 12:34:56 PM UTC+2, Martin Öjes wrote: >>>> >>>> We have experienced the same problem. It seems that Google changed the >>>> way GAE handles Warmup requests. We solved our issues by adding a warmup >>>> request handler to app.yaml and a small script just echoing an OK message. >>>> >>>> The updated documentation page (for PHP runtime), with a working >>>> example: >>>> https://cloud.google.com/appengine/docs/php/warmup-requests/configuring >>>> >>>> Best regards >>>> Martin >>>> >>> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/e4d8fcae-127e-45a9-91c3-27ea9e291f02%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
