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 <se...@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 <pomperma...@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 <pomperma...@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 <se...@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 <se...@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 < >>>>> pomperma...@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 >>>>>> >>>>>> >>>>> >>>> >>> >>> >
