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From Stephan Ewen <se...@apache.org>
Subject Re: JobManager is no longer reachable
Date Tue, 21 Jul 2015 14:09:56 GMT
Do you know which component logs via java.utils.logging?

On Tue, Jul 21, 2015 at 4:02 PM, Flavio Pompermaier <pompermaier@okkam.it>
wrote:

> I think that the problem is that the error was caused by a class logging
> through java.utils.logging and in the have those  logs working I had to put
> *SLF4JBridgeHandler.install();* at the beginning of the main().
> Probably this should be documented..actually I don't know why this worked
> :)
>
>
> On Tue, Jul 21, 2015 at 3:29 PM, Stephan Ewen <sewen@apache.org> wrote:
>
>> Exceptions are swallowed upon canceling (because canceling has usually
>> followup exceptions).
>>
>> Root error cause exceptions should never be swallowed.
>>
>> Do you have a specific place in mind where that happens?
>>
>> On Mon, Jun 29, 2015 at 4:49 PM, Flavio Pompermaier <pompermaier@okkam.it
>> > wrote:
>>
>>> I think that actually there's an Exception thrown within the code that I
>>> suspect it's not reported anywhere..could it be?
>>>
>>> On Mon, Jun 29, 2015 at 3:28 PM, Flavio Pompermaier <
>>> pompermaier@okkam.it> wrote:
>>>
>>>> Which file and which JVM options do I have to modify to try options 1
>>>> and 3..?
>>>>
>>>>    1. Don't fill the JVMs up to the limit with objects. Give more
>>>>    memory to the JVM, or give less memory to Flink managed memory
>>>>    2. Use more JVMs, i.e., a higher parallelism
>>>>    3. Use a concurrent garbage collector, like G1
>>>>
>>>> Actually, when I run the code from Eclipse I see an exception do to an
>>>> error in the data (because I try to read a URI that contains illegal
>>>> characters) but I don't think the program reach that point, I don't see
>>>> anywhere an exception and the error occur later on in the code..
>>>>
>>>> However, all of your options seems related to a scalability problem,
>>>> where I should add more resources to complete the work...while it works
>>>> locally in the IDE where I have less resources (except the gc that I use
>>>> default settings while I don't know if the cluster has some default
>>>> ones)..isn't it strange?
>>>>
>>>> On Mon, Jun 29, 2015 at 2:29 PM, Stephan Ewen <sewen@apache.org> wrote:
>>>>
>>>>> Hi Flavio!
>>>>>
>>>>> I had a look at the logs. There seems nothing suspicious - at some
>>>>> point, the TaskManager and JobManager declare each other unreachable.
>>>>>
>>>>> A pretty common cause for that is that the JVMs stall for a long time
>>>>> due to garbage collection. The JobManager cannot see the difference between
>>>>> a JVM that is irresponsive (due to garbage collection) and a JVM that
is
>>>>> dead.
>>>>>
>>>>> Here is what you can do to prevent long garbage collection stalls:
>>>>>
>>>>>  - Don't fill the JVMs up to the limit with objects. Give more memory
>>>>> to the JVM, or give less memory to Flink managed memory.
>>>>>  - Use more JVMs, i.e., a higher parallelism.
>>>>>  - Use a concurrent garbage collector, like G1.
>>>>>
>>>>>
>>>>> Greetings,
>>>>> Stephan
>>>>>
>>>>>
>>>>> On Mon, Jun 29, 2015 at 12:39 PM, Stephan Ewen <sewen@apache.org>
>>>>> wrote:
>>>>>
>>>>>> Hi Flavio!
>>>>>>
>>>>>> Can you post the JobManager's log here? It should have the message
>>>>>> about what is going wrong...
>>>>>>
>>>>>> Stephan
>>>>>>
>>>>>>
>>>>>> On Mon, Jun 29, 2015 at 11:43 AM, Flavio Pompermaier <
>>>>>> pompermaier@okkam.it> wrote:
>>>>>>
>>>>>>> Hi to all,
>>>>>>>
>>>>>>> I'm restarting the discussion about a problem I alredy dicussed
on
>>>>>>> this mailing list (but that started with a different subject).
>>>>>>> I'm running Flink 0.9.0 on CDH 5.1.3 so I compiled the sources
as:
>>>>>>>
>>>>>>> mvn clean  install -Dhadoop.version=2.3.0-cdh5.1.3
>>>>>>> -Dhbase.version=0.98.1-cdh5.1.3 -Dhadoop.core.version=2.3.0-mr1-cdh5.1.3
>>>>>>> -DskipTests -Pvendor-repos
>>>>>>>
>>>>>>> The problem I'm facing is that the cluster start successfully
but
>>>>>>> when I run my job (from the web-client) I get, after some time,
this
>>>>>>> exception:
>>>>>>>
>>>>>>> 16:35:41,636 WARN  akka.remote.RemoteWatcher
>>>>>>>             - Detected unreachable: [akka.tcp://
>>>>>>> flink@192.168.234.83:6123]
>>>>>>> 16:35:46,605 INFO  org.apache.flink.runtime.taskmanager.TaskManager
>>>>>>>   - Disconnecting from JobManager: JobManager is no longer reachable
>>>>>>> 16:35:46,614 INFO  org.apache.flink.runtime.taskmanager.TaskManager
>>>>>>>   - Cancelling all computations and discarding all cached data.
>>>>>>> 16:35:46,644 INFO  org.apache.flink.runtime.taskmanager.Task
>>>>>>>         - Attempting to fail task externally CHAIN GroupReduce
(GroupReduce
>>>>>>> at compactDataSources(MyClass.java:213)) -> Combine(Distinct
at
>>>>>>> compactDataSources(MyClass.java:213)) (8/36)
>>>>>>> 16:35:46,669 INFO  org.apache.flink.runtime.taskmanager.Task
>>>>>>>         - CHAIN GroupReduce (GroupReduce at
>>>>>>> compactDataSources(MyClass.java:213)) -> Combine(Distinct
at
>>>>>>> compactDataSources(MyClass.java:213)) (8/36) switched to FAILED
with
>>>>>>> exception.
>>>>>>> java.lang.Exception: Disconnecting from JobManager: JobManager
is no
>>>>>>> longer reachable
>>>>>>>         at org.apache.flink.runtime.taskmanager.TaskManager.org
>>>>>>> $apache$flink$runtime$taskmanager$TaskManager$$handleJobManagerDisconnect(TaskManager.scala:741)
>>>>>>>         at
>>>>>>> org.apache.flink.runtime.taskmanager.TaskManager$$anonfun$receiveWithLogMessages$1.applyOrElse(TaskManager.scala:267)
>>>>>>>         at
>>>>>>> scala.runtime.AbstractPartialFunction$mcVL$sp.apply$mcVL$sp(AbstractPartialFunction.scala:33)
>>>>>>>         at
>>>>>>> scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:33)
>>>>>>>         at
>>>>>>> scala.runtime.AbstractPartialFunction$mcVL$sp.apply(AbstractPartialFunction.scala:25)
>>>>>>>         at
>>>>>>> org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:36)
>>>>>>>         at
>>>>>>> org.apache.flink.runtime.ActorLogMessages$$anon$1.apply(ActorLogMessages.scala:29)
>>>>>>>         at
>>>>>>> scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118)
>>>>>>>         at
>>>>>>> org.apache.flink.runtime.ActorLogMessages$$anon$1.applyOrElse(ActorLogMessages.scala:29)
>>>>>>>         at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
>>>>>>>         at
>>>>>>> org.apache.flink.runtime.taskmanager.TaskManager.aroundReceive(TaskManager.scala:114)
>>>>>>>         at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
>>>>>>>         at
>>>>>>> akka.actor.dungeon.DeathWatch$class.receivedTerminated(DeathWatch.scala:46)
>>>>>>>         at
>>>>>>> akka.actor.ActorCell.receivedTerminated(ActorCell.scala:369)
>>>>>>>         at
>>>>>>> akka.actor.ActorCell.autoReceiveMessage(ActorCell.scala:501)
>>>>>>>         at akka.actor.ActorCell.invoke(ActorCell.scala:486)
>>>>>>>         at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
>>>>>>>         at akka.dispatch.Mailbox.run(Mailbox.scala:221)
>>>>>>>         at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
>>>>>>>         at
>>>>>>> scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
>>>>>>>         at
>>>>>>> scala.concurrent.forkjoin.ForkJoinPool$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(ForkJoinWorkerThread.java:107)
>>>>>>> 16:35:46,767 INFO  org.apache.flink.runtime.taskmanager.Task
>>>>>>>             - Triggering cancellation of task code CHAIN GroupReduce
>>>>>>> (GroupReduce at compactDataSources(MyClass.java:213)) -> Combine(Distinct
>>>>>>> at compactDataSources(MyClass.java:213)) (8/36)
>>>>>>> (57a0ad78726d5ba7255aa87038250c51).
>>>>>>>
>>>>>>> The job instead runs correctly from the IDE (Eclipse). How can
I
>>>>>>> understand/debug what's wrong?
>>>>>>>
>>>>>>> Best,
>>>>>>> Flavio
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>
>

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