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From Till Rohrmann <trohrm...@apache.org>
Subject Re: Diagnosing TaskManager disappearance
Date Thu, 29 Oct 2015 17:55:40 GMT
What does the log of the failed TaskManager 10.0.88.140 say?

On Thu, Oct 29, 2015 at 6:44 PM, Greg Hogan <code@greghogan.com> wrote:

> I removed the use of numactl but left in starting two TaskManagers and am
> still seeing TaskManagers crash.
> From the JobManager log:
>
> 17:36:06,412 WARN
> akka.remote.ReliableDeliverySupervisor                        - Association
> with remote system [akka.tcp://flink@10.0.88.140:45742] has failed,
> address
> is now gated for [5000] ms. Reason is: [Disassociated].
> 17:36:06,567 INFO
> org.apache.flink.runtime.executiongraph.ExecutionGraph        - CHAIN
> GroupReduce (Compute scores) -> FlatMap (checksum()) (370/2322)
> (cac9927a8568c2ad79439262a91478af) switched from RUNNING to FAILED
> 17:36:06,572 INFO
> org.apache.flink.runtime.jobmanager.JobManager                - Status of
> job 14d946015fd7b35eb801ea6fee5af9e4 (Flink Java Job at Thu Oct 29 17:34:48
> UTC 2015) changed to FAILING.
> java.lang.Exception: The data preparation for task 'CHAIN GroupReduce
> (Compute scores) -> FlatMap (checksum())' , caused an error: Error
> obtaining the sorted input: Thread 'SortMerger Reading Thread' terminated
> due to an exception: Connection unexpectedly closed by remote task manager
> 'ip-10-0-88-140/10.0.88.140:58558'. This might indicate that the remote
> task manager was lost.
>         at
> org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:465)
>         at
> org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:354)
>         at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.RuntimeException: Error obtaining the sorted input:
> Thread 'SortMerger Reading Thread' terminated due to an exception:
> Connection unexpectedly closed by remote task manager 'ip-10-0-88-140/
> 10.0.88.140:58558'. This might indicate that the remote task manager was
> lost.
>         at
>
> org.apache.flink.runtime.operators.sort.UnilateralSortMerger.getIterator(UnilateralSortMerger.java:619)
>         at
> org.apache.flink.runtime.operators.BatchTask.getInput(BatchTask.java:1089)
>         at
>
> org.apache.flink.runtime.operators.GroupReduceDriver.prepare(GroupReduceDriver.java:94)
>         at
> org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:459)
>         ... 3 more
> Caused by: java.io.IOException: Thread 'SortMerger Reading Thread'
> terminated due to an exception: Connection unexpectedly closed by remote
> task manager 'ip-10-0-88-140/10.0.88.140:58558'. This might indicate that
> the remote task manager was lost.
>         at
>
> org.apache.flink.runtime.operators.sort.UnilateralSortMerger$ThreadBase.run(UnilateralSortMerger.java:800)
> Caused by:
>
> org.apache.flink.runtime.io.network.netty.exception.RemoteTransportException:
> Connection unexpectedly closed by remote task manager 'ip-10-0-88-140/
> 10.0.88.140:58558'. This might indicate that the remote task manager was
> lost.
>         at
>
> org.apache.flink.runtime.io.network.netty.PartitionRequestClientHandler.channelInactive(PartitionRequestClientHandler.java:119)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194)
>         at
>
> io.netty.channel.ChannelInboundHandlerAdapter.channelInactive(ChannelInboundHandlerAdapter.java:75)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194)
>         at
>
> io.netty.handler.codec.ByteToMessageDecoder.channelInactive(ByteToMessageDecoder.java:306)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelInactive(AbstractChannelHandlerContext.java:208)
>         at
>
> io.netty.channel.AbstractChannelHandlerContext.fireChannelInactive(AbstractChannelHandlerContext.java:194)
>         at
>
> io.netty.channel.DefaultChannelPipeline.fireChannelInactive(DefaultChannelPipeline.java:828)
>         at
>
> io.netty.channel.AbstractChannel$AbstractUnsafe$7.run(AbstractChannel.java:621)
>         at
>
> io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358)
>         at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
>         at
>
> io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
>         at java.lang.Thread.run(Thread.java:745)
> 17:36:06,587 INFO
> org.apache.flink.runtime.executiongraph.ExecutionGraph        - CHAIN
> GroupReduce (Compute scores) -> FlatMap (checksum()) (367/2322)
> (d63c681a18b8164bc24936df1ecb159b) switched from RUNNING to FAILED
>
>
> On Thu, Oct 29, 2015 at 1:00 PM, Stephan Ewen <sewen@apache.org> wrote:
>
> > Hi Greg!
> >
> > Interesting... When you say the TaskManagers are dropping, are the
> > TaskManager processes crashing, or are they loosing connection to the
> > JobManager?
> >
> > Greetings,
> > Stephan
> >
> >
> > On Thu, Oct 29, 2015 at 9:56 AM, Greg Hogan <code@greghogan.com> wrote:
> >
> > > I recently discovered that AWS uses NUMA for its largest nodes. An
> > example
> > > c4.8xlarge:
> > >
> > > $ numactl --hardware
> > > available: 2 nodes (0-1)
> > > node 0 cpus: 0 1 2 3 4 5 6 7 8 18 19 20 21 22 23 24 25 26
> > > node 0 size: 29813 MB
> > > node 0 free: 24537 MB
> > > node 1 cpus: 9 10 11 12 13 14 15 16 17 27 28 29 30 31 32 33 34 35
> > > node 1 size: 30574 MB
> > > node 1 free: 22757 MB
> > > node distances:
> > > node   0   1
> > >   0:  10  20
> > >   1:  20  10
> > >
> > > I discovered yesterday that Flink performed ~20-30% faster on large
> > > datasets by running two NUMA-constrained TaskManagers per node. The
> > > JobManager node ran a single TaskManager. Resources were divided in
> half
> > > relative to running a single TaskManager.
> > >
> > > The changes from the tail of /bin/taskmanager.sh:
> > >
> > > -"${FLINK_BIN_DIR}"/flink-daemon.sh $STARTSTOP taskmanager "${args[@]}"
> > > +numactl --membind=0 --cpunodebind=0 "${FLINK_BIN_DIR}"/flink-daemon.sh
> > > $STARTSTOP taskmanager "${args[@]}"
> > > +numactl --membind=1 --cpunodebind=1 "${FLINK_BIN_DIR}"/flink-daemon.sh
> > > $STARTSTOP taskmanager "${args[@]}"
> > >
> > > After reverting this change the system is again stable. I had not
> > > experienced issues using numactl when running 16 nodes.
> > >
> > > Greg
> > >
> >
>

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