There are MANY JDKS installed already. Oracle JDKs OpenJDKs AdoptOpenJDKs - they are all already there.
https://cwiki.apache.org/confluence/display/INFRA/JDK+Installation+Matrix On Mon, Jul 26, 2021 at 11:47 AM Arnaud Héritier <[email protected]> wrote: > It has to be discussed with infra. > I am not sure which distro is used. > It's a Private Build of openJDK 8 (today CloudBees CI doesn't support > something else than Java 8 - no comment) > I don't have the feeling for now (with the data I reviewed) that it's a > memory / GC issue (it could create disconnections under high load) > Here the stability issue occurs even when the controller does nothing (the > controller cannot ping the agent or vice and versa) and it seems to impact > more the linux agents than the windows ones (it's a pity) > > > > On Fri, Jul 23, 2021 at 12:06 AM Tibor Digana <[email protected]> > wrote: > >> Can you install AdoptOpenJdk for the Jenkins controller? >> It contains Eclipse OpenJ9 Garbage Collector and it significantly >> decreases >> memory consumption of the application due to the meta space goes to the >> disk. >> You should save 40 - 75% out of 3GB. >> I used G1, Shenandoah, ZGC and Eclipse OpenJ9 which saved the most memory. >> >> On Thu, Jul 22, 2021 at 9:23 AM Arnaud Héritier <[email protected]> >> wrote: >> >> > yes for the controller it depends of its size (number of jobs and types >> of >> > jobs) but here we are fine it seems with our 3Gb >> > >> > * Java >> > - Version: 1.8.0_292 >> > - Maximum memory: 3.00 GB (3221225472) >> > - Allocated memory: 3.00 GB (3221225472) >> > - Free memory: 750.15 MB (786591664) >> > - In-use memory: 2.27 GB (2434633808) >> > - GC strategy: G1 >> > - Available CPUs: 2 >> > >> > For agents I reduced the memory allocated to the agent process but it >> > doesn't help much (it seems - even if it is still a good thing to do) >> > >> > What is strange is that I see our agents sometimes disconnected even >> when >> > we have no activity on the jenkins controller >> > >> > Sadly jenkins is deployed on Apache Tomcat thus I cannot get access to >> its >> > logs >> > >> > In general the connection lost is detected by what we call the >> PingThread ( >> > >> > >> https://www.jenkins.io/doc/book/system-administration/monitoring/#ping-thread >> > ) but not only >> > >> > https://ci-maven.apache.org/log/all >> > >> > For example it was few minutes ago we got 3 agents disconnected while >> > nothing was running >> > >> > 2021-07-22 06:58:21.769+0000 [id=106291] INFO >> > hudson.slaves.ChannelPinger$1#onDead: >> > Ping failed. Terminating the channel maven4. >> > java.util.concurrent.TimeoutException: Ping started at 1626936861769 >> hasn't >> > completed by 1626937101769 >> > at hudson.remoting.PingThread.ping(PingThread.java:134) >> > at hudson.remoting.PingThread.run(PingThread.java:90) >> > 2021-07-22 06:58:21.778+0000 [id=106292] INFO >> > hudson.slaves.ChannelPinger$1#onDead: >> > Ping failed. Terminating the channel maven3. >> > java.util.concurrent.TimeoutException: Ping started at 1626936861777 >> hasn't >> > completed by 1626937101778 >> > at hudson.remoting.PingThread.ping(PingThread.java:134) >> > at hudson.remoting.PingThread.run(PingThread.java:90) >> > 2021-07-22 06:58:21.983+0000 [id=106295] INFO >> > hudson.slaves.ChannelPinger$1#onDead: >> > Ping failed. Terminating the channel maven5. >> > java.util.concurrent.TimeoutException: Ping started at 1626936861982 >> hasn't >> > completed by 1626937101983 >> > at hudson.remoting.PingThread.ping(PingThread.java:134) >> > at hudson.remoting.PingThread.run(PingThread.java:90) >> > >> > @Gavin McDonald <[email protected]> In terms of network, is it the >> same >> > environment we use today compared to the ci-builds.apache.org >> environment >> > ? >> > >> > >> > On Wed, Jul 21, 2021 at 11:48 PM Tibor Digana <[email protected]> >> > wrote: >> > >> > > In my company, I also used 1GB for Xmx of Java Heap for the Jenkins >> JVM >> > and >> > > it was enough. >> > > The subprocesses like Maven need to have much more memory to allocate >> for >> > > themself rather than Jenkins JVM. >> > > T >> > > >> > > On Wed, Jul 21, 2021 at 6:38 PM Arnaud Héritier <[email protected]> >> > > wrote: >> > > >> > > > I am looking at our builds and I try to understand why our agents >> are >> > > often >> > > > disconnected during the builds. >> > > > We have in general a stacktrace like >> > > > >> > > > maven6 was marked offline: Connection was broken: >> java.io.IOException: >> > > > Pipe closed after 0 cycles >> > > > at >> > > > >> > > >> > >> org.apache.sshd.common.channel.ChannelPipedInputStream.read(ChannelPipedInputStream.java:118) >> > > > at >> > > > >> > > >> > >> org.apache.sshd.common.channel.ChannelPipedInputStream.read(ChannelPipedInputStream.java:101) >> > > > at >> > > > >> > > >> > >> hudson.remoting.FlightRecorderInputStream.read(FlightRecorderInputStream.java:92) >> > > > at >> > > > >> > >> hudson.remoting.ChunkedInputStream.readHeader(ChunkedInputStream.java:73) >> > > > at >> > > > >> > > >> > >> hudson.remoting.ChunkedInputStream.readUntilBreak(ChunkedInputStream.java:103) >> > > > at >> > > > >> > > >> > >> hudson.remoting.ChunkedCommandTransport.readBlock(ChunkedCommandTransport.java:39) >> > > > at >> > > > >> > > >> > >> hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34) >> > > > at >> > > > >> > > >> > >> hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:63) >> > > > >> > > > >> > > > >> > > > As far I can see we are using 16Gb "hosts" for linux agents >> > > > >> > > > Something very strange is that the jenkins agent (this small >> component >> > > > doing the link between the build host and the controller) is >> configured >> > > > with `-Xms8g -Xmx8g` thus we are reserving for it 50% of the server >> mem >> > > > (even more because of the non-heap) >> > > > This one in general should require in general really less. 1Gb is >> > > already a >> > > > lot from my exp. >> > > > Due to this, the OS can see it has the biggest process on the host >> and >> > > > decide to kill it when the rest of the memory is used by the build. >> > > > I think we should decrease this value. >> > > > (I can do it but I don't know how was configured the ci.apache.org >> > > agents >> > > > and I would like to not add more issue if this setting was here in >> the >> > > past >> > > > >> > > > I don't think it is the root cause of our instabilities (at least >> all) >> > > and >> > > > there is something else I have to find but it's a cheap fix to try >> > > > >> > > > FYI our agents VMs are ~like this today: >> > > > >> > > > - Java >> > > > + Home: `/usr/local/asfpackages/java/oraclejdk-1.8.0-291/jre` >> > > > + Vendor: Oracle Corporation >> > > > + Version: 1.8.0_291 >> > > > + Maximum memory: 7.67 GB (8232370176) >> > > > + Allocated memory: 7.67 GB (8232370176) >> > > > + Free memory: 6.03 GB (6470953760) >> > > > + In-use memory: 1.64 GB (1761416416) >> > > > + GC strategy: ParallelGC >> > > > + Available CPUs: 4 >> > > > >> > > > 8Gb is reserved, 1Gb is used (because the GC does nothing as the >> Free >> > mem >> > > > is high) >> > > > >> > > > I would be in favor to try to launch them with -Xms128m >> > > > -Xmx1g -XX:+UseG1GC -XX:+UseStringDeduplication >> > > > >> > > > I think it's enough customization to start with >> > > > >> > > > Cheers >> > > > >> > > > On Wed, Jul 21, 2021 at 1:28 PM Arnaud Héritier < >> [email protected]> >> > > > wrote: >> > > > >> > > > > I am not sure about the setup >> > > > > AFAICS we don't use any JDK installer ( >> > > > > https://ci-maven.apache.org/configureTools/ ) thus I suppose that >> > the >> > > > > different JDKs are supposed to be installed directly on the agent >> ? >> > > > > I am not sure how it was done on the previous environment >> > > > > >> > > > > On Sun, Jul 18, 2021 at 5:30 PM Tibor Digana < >> [email protected] >> > > >> > > > > wrote: >> > > > > >> > > > >> The new CI system has the following issue: >> > > > >> >> > > > >> /home/jenkins/tools/java/latest1.7/bin/java: not found >> > > > >> >> > > > >> >> > > > >> >> > > > >> > > >> > >> https://ci-maven.apache.org/job/Maven/job/maven-box/job/maven-surefire/job/master/104/execution/node/183/log/ >> > > > >> >> > > > >> >> > > > >> >> > > > >> On Wed, Jun 30, 2021 at 8:03 PM Gavin McDonald < >> > [email protected]> >> > > > >> wrote: >> > > > >> >> > > > >> > Hi Maven folks. >> > > > >> > >> > > > >> > Infra has decided to separate off the Maven build jobs from >> > > > >> > ci-builds.apache.org over to its very own Jenkins Controller >> and >> > > > >> Agents. >> > > > >> > >> > > > >> > This means that Maven now has a dedicated Jenkins environment >> for >> > > > >> itself. >> > > > >> > It >> > > > >> > also means that no other projects build jobs can build on the >> > Maven >> > > > >> nodes; >> > > > >> > and >> > > > >> > then Maven jobs will no longer be able to build on the >> ci-builds >> > > > jobs. >> > > > >> > >> > > > >> > Your new Controller is set up as https://ci-maven.apache.org >> and >> > > all >> > > > >> Maven >> > > > >> > Committers >> > > > >> > can login via LDAP and create jobs. >> > > > >> > >> > > > >> > At the time of writing, there is one node/agent attached but I >> am >> > > > >> building >> > > > >> > 4 more - all >> > > > >> > Ubuntu 20.04 and based in our Azure account. >> > > > >> > >> > > > >> > We can automagically move all your jobs over from ci-builds to >> > > > ci-maven >> > > > >> - I >> > > > >> > just need someone to tell me go ahead and do it. >> > > > >> > >> > > > >> > In the meantime, feel free to have a test. The remaining 4 >> agents >> > > will >> > > > >> be >> > > > >> > online >> > > > >> > by tomorrow. We will review after a month if 5 is enough nodes. >> > > > >> > >> > > > >> > As with other projects having their own dedicated controller, >> who >> > > have >> > > > >> > taken advantage >> > > > >> > of this isolation by having some nodes/agents given to the >> project >> > > as >> > > > a >> > > > >> > 'targeted donation' >> > > > >> > so someone here may know of a Company will to donate 5 - 10 or >> > more >> > > > >> nodes >> > > > >> > specifically >> > > > >> > for Maven Jenkins environment. Infra can afford to hand you >> over 5 >> > > > right >> > > > >> > now. >> > > > >> > >> > > > >> > Let me know if you have any questions, otherwise let me know >> when >> > I >> > > > can >> > > > >> > make the >> > > > >> > transfer of your jobs. >> > > > >> > >> > > > >> > Thanks >> > > > >> > >> > > > >> > -- >> > > > >> > >> > > > >> > *Gavin McDonald* >> > > > >> > Systems Administrator >> > > > >> > ASF Infrastructure Team >> > > > >> > >> > > > >> >> > > > > >> > > > > >> > > > > -- >> > > > > Arnaud Héritier >> > > > > Twitter/Skype : aheritier >> > > > > >> > > > >> > > > >> > > > -- >> > > > Arnaud Héritier >> > > > Twitter/Skype : aheritier >> > > > >> > > >> > >> > >> > -- >> > Arnaud Héritier >> > Twitter/Skype : aheritier >> > >> > > > -- > Arnaud Héritier > Twitter/Skype : aheritier > -- *Gavin McDonald* Systems Administrator ASF Infrastructure Team
