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From "Michael K. Edwards" <m.k.edwa...@gmail.com>
Subject Re: Glide path to getting 3.5.x out of beta
Date Thu, 22 Nov 2018 11:51:18 GMT
I think it's mostly a problem in CI, where other processes on the same
machine may compete for the port range, producing spurious Jenkins
failures.  The only failures I'm seeing locally are unrelated SSL
issues.
On Thu, Nov 22, 2018 at 3:45 AM Enrico Olivelli <eolivelli@gmail.com> wrote:
>
> Il giorno gio 22 nov 2018 alle ore 12:44 Michael K. Edwards
> <m.k.edwards@gmail.com> ha scritto:
> >
> > I'm glad to be able to help.
> >
> > It appears as though some of the "flaky tests" result from another
> > process stealing a server port between the time that it is assigned
> > (in org.apache.zookeeper.PortAssignment.unique()) and the time that it
> > is bound.
>
> You can try running tests using a single thread, this will "mitigate"
> the problem a bit
>
> Enrico
>
> This happened, for example, in
> > https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/2708/;
> > looking in the console text, I found:
> >
> >      [exec]     [junit] 2018-11-22 00:18:30,336 [myid:] - INFO
> > [QuorumPeerListener:QuorumCnxManager$Listener@884] - My election bind
> > port: localhost/127.0.0.1:19459
> >      [exec]     [junit] 2018-11-22 00:18:30,337 [myid:] - INFO
> > [QuorumPeer[myid=1](plain=/127.0.0.1:19457)(secure=disabled):NettyServerCnxnFactory@493]
> > - binding to port localhost/127.0.0.1:19466
> >      [exec]     [junit] 2018-11-22 00:18:30,337 [myid:] - ERROR
> > [QuorumPeer[myid=1](plain=/127.0.0.1:19457)(secure=disabled):NettyServerCnxnFactory@497]
> > - Error while reconfiguring
> >      [exec]     [junit] org.jboss.netty.channel.ChannelException:
> > Failed to bind to: localhost/127.0.0.1:19466
> >      [exec]     [junit] at
> > org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:272)
> >      [exec]     [junit] at
> > org.apache.zookeeper.server.NettyServerCnxnFactory.reconfigure(NettyServerCnxnFactory.java:494)
> >      [exec]     [junit] at
> > org.apache.zookeeper.server.quorum.QuorumPeer.processReconfig(QuorumPeer.java:1947)
> >      [exec]     [junit] at
> > org.apache.zookeeper.server.quorum.Follower.processPacket(Follower.java:154)
> >      [exec]     [junit] at
> > org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:93)
> >      [exec]     [junit] at
> > org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1263)
> >      [exec]     [junit] Caused by: java.net.BindException: Address
> > already in use
> >      [exec]     [junit] at sun.nio.ch.Net.bind0(Native Method)
> >      [exec]     [junit] at sun.nio.ch.Net.bind(Net.java:433)
> >      [exec]     [junit] at sun.nio.ch.Net.bind(Net.java:425)
> >      [exec]     [junit] at
> > sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
> >      [exec]     [junit] at
> > sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
> >      [exec]     [junit] at
> > org.jboss.netty.channel.socket.nio.NioServerBoss$RegisterTask.run(NioServerBoss.java:193)
> >      [exec]     [junit] at
> > org.jboss.netty.channel.socket.nio.AbstractNioSelector.processTaskQueue(AbstractNioSelector.java:391)
> >      [exec]     [junit] at
> > org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:315)
> >      [exec]     [junit] at
> > org.jboss.netty.channel.socket.nio.NioServerBoss.run(NioServerBoss.java:42)
> >      [exec]     [junit] at
> > org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
> >      [exec]     [junit] at
> > org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
> >      [exec]     [junit] at
> > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> >      [exec]     [junit] at
> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> >      [exec]     [junit] at java.lang.Thread.run(Thread.java:748)
> >
> > We currently log-and-swallow this exception (and many others) down in
> > NettyServerCnxnFactory.reconfigure() and
> > NIOServerCnxnFactory.reconfigure(), which is ... not ideal.
> >
> > How should we handle a bind failure in the real world?  Seems like we
> > ought to throw a BindException out at least as far as the caller of
> > QuorumPeer.processReconfig().  That's either
> > Follower/Leader/Learner/Observer or FastLeaderElection.  Presumably
> > they should immediately go read-only when they can't bind the client
> > port?
> > On Thu, Nov 22, 2018 at 1:23 AM Enrico Olivelli <eolivelli@gmail.com> wrote:
> > >
> > > Thank you very much Michael
> > > I am following and reviewing your patches
> > >
> > > Enrico
> > > Il giorno gio 22 nov 2018 alle ore 10:14 Michael K. Edwards
> > > <m.k.edwards@gmail.com> ha scritto:
> > > >
> > > > Hmm.  Jira's a bit of a boneyard, isn't it?  And timeouts in flaky
> > > > tests are a problem.
> > > >
> > > > I scrubbed through the open bugs and picked the ones that looked to me
> > > > like they might deserve attention for 3.5.5 or soon thereafter.
> > > > They're all on my watchlist:
> > > > https://issues.apache.org/jira/issues/?filter=-1&jql=watcher%20%3D%20mkedwards%20AND%20resolution%20%3D%20Unresolved%20ORDER%20BY%20created%20ASC
> > > > (I'm not counting the Ant->Maven transition in that, which I don't
> > > > know much about.)
> > > >
> > > > I'm trying out some more verbose logging for the junit tests, to try
> > > > to understand test flakiness.  But the Jenkins pre-commit pipeline
> > > > appears to be down?
> > > > https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/
> > > > On Wed, Nov 21, 2018 at 2:29 PM Michael K. Edwards
> > > > <m.k.edwards@gmail.com> wrote:
> > > > >
> > > > > Looks like we're really close.  Can I help?
> > > > >
> > > > > I think this is the list of release blockers:
> > > > > https://issues.apache.org/jira/issues/?jql=project%20%3D%20ZooKeeper%20and%20resolution%20%3D%20Unresolved%20and%20fixVersion%20%3D%203.5.5%20AND%20priority%20in%20(blocker%2C%20critical)%20ORDER%20BY%20priority%20DESC%2C%20key%20ASC
> > > > >
> > > > > I currently see 7 issues in that search, of which 4 are aspects of
the
> > > > > ongoing switch from ant to maven.  Setting that aside for the moment,
> > > > > there are 3 critical bugs:
> > > > >
> > > > > ZOOKEEPER-2778  Potential server deadlock between follower sync with
> > > > > leader and follower receiving external connection requests.
> > > > >
> > > > > ZOOKEEPER-1636  c-client crash when zoo_amulti failed
> > > > >
> > > > > ZOOKEEPER-1818  Fix don't care for trunk
> > > > >
> > > > > I put them in that order because that's the order in which I've
> > > > > stacked the fixes in
> > > > > https://github.com/mkedwards/zookeeper/tree/branch-3.5.  Then on
top
> > > > > of that, I've updated the versions of the external library
> > > > > dependencies I think it's important to update: Jetty, Jackson, and
> > > > > BouncyCastle.  The result seems to be a green build in Jenkins:
> > > > > https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/2705/
> > > > >
> > > > > Are these fixes in principle landable on the 3.5 branch, or do they
> > > > > have to go to master first?  Does master need help to build green
> > > > > before these can land there?  Are there other bugs that are similarly
> > > > > critical to fix, and not tagged for 3.5.5 in Jira?  Is there other
> > > > > testing that I can help with?  Are more hands needed on the Maven
> > > > > work?
> > > > >
> > > > > Thanks for all the work that goes into keeping Zookeeper healthy
and
> > > > > advancing; it's a critical infrastructure component in several systems
> > > > > I help develop and operate, and I like being able to rely on it.
> > > > >
> > > > > Cheers,
> > > > > - Michael

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