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From amir bahmanyari <amirto...@yahoo.com>
Subject Re: Why did the Flink Cluster JM crash?
Date Wed, 09 Nov 2016 19:02:53 GMT
Thanks Till.I have been trying out many many configuration combinations to get to the peak
of what I can get as a reasonable performance.And yes, when I drop the number of slots, I
dont get OOM. However, I dont get the response I want either.The amount of data I send is
kinda huge; about 105 G that's sent in an stretch of 3.5 hours to a 4 nodes cluster running
my Beam app receiving from a 2 nodes cluster of Kafka.From what I understand, you are suggesting
that to get the best performance, the total number of slots should be equal to the total number
of cores distributed in the cluster.For the sake of making sure we have done that, I would
go back and repeat the testing with that in mind.Fyi, the Kafka partitions are 4096. Roughly,
1024 per 16 cores per one node. Is this reasonable?Once I know the answer to this question,
I will go ahead and readjust my config and repeat the test.I appreciate your response.Amir-

      From: Till Rohrmann <till.rohrmann@gmail.com>
 To: amir bahmanyari <amirtousa@yahoo.com> 
Cc: "user@flink.apache.org" <user@flink.apache.org>
 Sent: Wednesday, November 9, 2016 1:27 AM
 Subject: Re: Why did the Flink Cluster JM crash?
Hi Amir,
I fear that 900 slots per task manager is a bit too many unless your machine has 900 cores.
As a rule of thumb you should allocate as many slots as your machines have cores. Maybe you
could try to decrease the number of slots and see if you still observe an OOM error.
On Wed, Nov 9, 2016 at 12:10 AM, amir bahmanyari <amirtousa@yahoo.com> wrote:

Ok. There is an OOM exception...but this used to work fine with the same configurations.There
are four nodes: beam1 through 4.The Kafka partitions are 4096 > 3584 deg of parallelism.
jobmanager.rpc.address: beam1jobmanager.rpc.port: 6123jobmanager.heap.mb: 1024taskmanager.heap.mb:
102400taskmanager.numberOfTaskSlots:  896 taskmanager.memory. preallocate: false
parallelism.default: 3584

Thanks for your valuable time Till.
AnonymousParDo -> AnonymousParDo (3584/3584) ( ebe8da5bda017ee31ad774c5bc5e5e 88) switched
from DEPLOYING to RUNNING2016-11-08 22:51:44,471 INFO  org.apache.flink.runtime. executiongraph.ExecutionGraph
       - Source: Read(UnboundedKafkaSource) -> AnonymousParDo -> AnonymousParDo
(3573/3584) ( ddf5a8939c1fc4ad1e6d71f17fe5ab 0b) switched from RUNNING to FAILED2016-11-08
22:51:44,474 INFO  org.apache.flink.runtime. executiongraph.ExecutionGraph        - Source:
Read(UnboundedKafkaSource) -> AnonymousParDo -> AnonymousParDo (1/3584) ( 865c54432153a0230e62bf7610118f
f8) switched from RUNNING to CANCELING2016-11-08 22:51:44,474 INFO  org.apache.flink.runtime.
jobmanager.JobManager                - Status of job e61cada683c0f7a709101c26c2c9a1
7c (benchbeamrunners-abahman- 1108225128) changed to FAILING.java.lang.OutOfMemoryError: unable
to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.
java:714) at java.util.concurrent. ThreadPoolExecutor.addWorker( ThreadPoolExecutor.java:950)
at java.util.concurrent. ThreadPoolExecutor. ensurePrestart( ThreadPoolExecutor.java:1587)
at java.util.concurrent. ScheduledThreadPoolExecutor. delayedExecute( ScheduledThreadPoolExecutor.
java:334) at java.util.concurrent. ScheduledThreadPoolExecutor. schedule( ScheduledThreadPoolExecutor.
java:533) at java.util.concurrent. Executors$ DelegatedScheduledExecutorServ ice.schedule(Executors.java:
729) at org.apache.flink.streaming. runtime.tasks.StreamTask. registerTimer(StreamTask.java:
652) at org.apache.flink.streaming. api.operators. AbstractStreamOperator. registerTimer(
AbstractStreamOperator.java: 250) at org.apache.flink.streaming. api.operators. StreamingRuntimeContext.
registerTimer( StreamingRuntimeContext.java: 92) at org.apache.beam.runners.flink. translation.wrappers.streaming.io.
UnboundedSourceWrapper. setNextWatermarkTimer( UnboundedSourceWrapper.java: 381) at org.apache.beam.runners.flink.
translation.wrappers.streaming.io. UnboundedSourceWrapper.run( UnboundedSourceWrapper.java:
233) at org.apache.flink.streaming. api.operators.StreamSource. run(StreamSource.java:78)
at org.apache.flink.streaming. runtime.tasks. SourceStreamTask.run( SourceStreamTask.java:56)
at org.apache.flink.streaming. runtime.tasks.StreamTask. invoke(StreamTask.java:224) at org.apache.flink.runtime.
taskmanager.Task.run(Task. java:559) at java.lang.Thread.run(Thread. java:745)

      From: Till Rohrmann <till.rohrmann@gmail.com>
 To: user@flink.apache.org; amir bahmanyari <amirtousa@yahoo.com> 
 Sent: Tuesday, November 8, 2016 2:11 PM
 Subject: Re: Why did the Flink Cluster JM crash?
Hi Amir,
what does the JM logs say?
On Tue, Nov 8, 2016 at 9:33 PM, amir bahmanyari <amirtousa@yahoo.com> wrote:

Hi colleagues,I started the cluster all fine. Started the Beam app running in the Flink Cluster
fine.Dashboard showed all tasks being consumed and open for business.I started sending data
to the Beam app, and all of the sudden the Flink JM crashed.Exceptions below.Thanks+regardsAmir
java.lang.RuntimeException: Pipeline execution failed        at org.apache.beam.runners.flink.
FlinkRunner.run(FlinkRunner. java:113)        at org.apache.beam.runners.flink. FlinkRunner.run(FlinkRunner.
java:48)        at org.apache.beam.sdk.Pipeline. run(Pipeline.java:183)        at
benchmark.flinkspark.flink. BenchBeamRunners.main( BenchBeamRunners.java:622)  //p.run(); 
      at sun.reflect. NativeMethodAccessorImpl. invoke0(Native Method)        at sun.reflect.
NativeMethodAccessorImpl. invoke( NativeMethodAccessorImpl.java: 62)        at sun.reflect.
DelegatingMethodAccessorImpl. invoke( DelegatingMethodAccessorImpl. java:43)        at
java.lang.reflect.Method. invoke(Method.java:498)        at org.apache.flink.client. program.PackagedProgram.
callMainMethod( PackagedProgram.java:505)        at org.apache.flink.client. program.PackagedProgram.
invokeInteractiveModeForExecut ion(PackagedProgram.java:403)        at org.apache.flink.client.
program.Client.runBlocking( Client.java:248)        at org.apache.flink.client. CliFrontend.
executeProgramBlocking( CliFrontend.java:866)        at org.apache.flink.client. CliFrontend.run(CliFrontend.
java:333)        at org.apache.flink.client. CliFrontend.parseParameters( CliFrontend.java:1189) 
      at org.apache.flink.client. CliFrontend.main(CliFrontend. java:1239)Caused by: org.apache.flink.client.
program. ProgramInvocationException: The program execution failed: Communication with JobManager
failed: Lost connection to the JobManager.        at org.apache.flink.client. program.Client.runBlocking(
Client.java:381)        at org.apache.flink.client. program.Client.runBlocking( Client.java:355) 
      at org.apache.flink.streaming. api.environment. StreamContextEnvironment. execute(
StreamContextEnvironment.java: 65)        at org.apache.beam.runners.flink. FlinkPipelineExecutionEnvironm
ent.executePipeline( FlinkPipelineExecutionEnvironm ent.java:118)        at org.apache.beam.runners.flink.
FlinkRunner.run(FlinkRunner. java:110)        ... 14 moreCaused by: org.apache.flink.runtime.
client.JobExecutionException: Communication with JobManager failed: Lost connection to the
JobManager.        at org.apache.flink.runtime. client.JobClient. submitJobAndWait(JobClient.
java:140)        at org.apache.flink.client. program.Client.runBlocking( Client.java:379) 
      ... 18 moreCaused by: org.apache.flink.runtime. client. JobClientActorConnectionTimeou
tException: Lost connection to the JobManager.        at org.apache.flink.runtime. client.JobClientActor.
handleMessage(JobClientActor. java:244)        at org.apache.flink.runtime.akka. FlinkUntypedActor.
handleLeaderSessionID( FlinkUntypedActor.java:88)        at org.apache.flink.runtime.akka.
FlinkUntypedActor.onReceive( FlinkUntypedActor.java:68)        at akka.actor.UntypedActor$$
anonfun$receive$1.applyOrElse( UntypedActor.scala:167)        at akka.actor.Actor$class.
aroundReceive(Actor.scala:465)        at akka.actor.UntypedActor. aroundReceive(UntypedActor.
scala:97)        at akka.actor.ActorCell. receiveMessage(ActorCell. scala:516)     
  at akka.actor.ActorCell.invoke( ActorCell.scala:487)        at akka.dispatch.Mailbox.
processMailbox(Mailbox.scala: 254)        at akka.dispatch.Mailbox.run( Mailbox.scala:221) 
      at akka.dispatch.Mailbox.exec( Mailbox.scala:231)        at scala.concurrent.forkjoin.
ForkJoinTask.doExec( ForkJoinTask.java:260)        at scala.concurrent.forkjoin. ForkJoinPool$WorkQueue.
pollAndExecAll(ForkJoinPool. java:1253)        at scala.concurrent.forkjoin. ForkJoinPool$WorkQueue.
runTask(ForkJoinPool.java: 1346)        at scala.concurrent.forkjoin. ForkJoinPool.runWorker(
ForkJoinPool.java:1979)        at scala.concurrent.forkjoin. ForkJoinWorkerThread.run(


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