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From Flavio Pompermaier <pomperma...@okkam.it>
Subject Re: JobManager is no longer reachable
Date Tue, 21 Jul 2015 14:02:05 GMT
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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