flink-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Abdul Qadeer <quadeer....@gmail.com>
Subject Re: Taskmanager times out continuously for registration with Jobmanager
Date Fri, 12 Oct 2018 21:27:19 GMT
We were able to fix it by passing IP address instead of hostname for actor
system listen address when starting taskmanager:

def runTaskManager(
                    taskManagerHostname: String,
                    resourceID: ResourceID,
                    actorSystemPort: Int,
                    configuration: Configuration,
                    highAvailabilityServices: HighAvailabilityServices)
: Unit = {


The following log message at jobmanager gave some clue:

{"timeMillis":1539297842333,"thread":"jobmanager-future-thread-2","level":"DEBUG","loggerName":"org.apache.flink.runtime.rest.handler.legacy.metrics.MetricFetcher","message":"Could
not retrieve QueryServiceGateway.","thrown":{"commonElementCount":0,"localizedMessage":"akka.actor.ActorNotFound:
Actor not found for:
ActorSelection[Anchor(akka.tcp://flink@taskmgr-6b59f97748-fmgwn:8070/),
Path(/user/MetricQueryService_5261ccab66b86b53a4edd64f26c1f282)]"...

...


We figured there is some problem with hostname resolution after the
actor is quarantined, would you know why this happens? Is it some
cache problem in Flink or Akka code JobManager is using?


On Fri, Oct 12, 2018 at 1:05 AM Till Rohrmann <trohrmann@apache.org> wrote:

> It is hard to tell without all logs but it could easily be a K8s setup
> problem. Also problematic is that you are running a Flink version which is
> no longer actively supported. Try at least to use the latest bug fix
> release for 1.4.
>
> Cheers,
> Till
>
> On Fri, Oct 12, 2018, 09:43 Abdul Qadeer <quadeer.leo@gmail.com> wrote:
>
>> Hi Till,
>>
>> A few more data points:
>>
>> In a rerun of the same versions with fresh deployment, I see *log*.debug(*s"RegisterTaskManager:
>> $*msg*"*) in JobManager, however the
>> *AcknowledgeRegistration/AlreadyRegistered *messages are never sent, I
>> have taken tcpdump for the taskmanager which doesn't recover and compared
>> it with another taskmanager which recovers after restart (i.e. receives
>> *AcknowledgeRegistration *message).
>>
>> Restarting the docker container of bad taskmanager doesn't work. The only
>> workaround right now is to delete the kubernetes pod holding the bad
>> taskmanager container. Does it have to do something with the akka address
>> the jobmanager stores for a taskmanager? The only variable I see between
>> restarting container vs pod is the change in the akka address.
>>
>> Also, the infinite retries for registration start after the taskmanager
>> container restarts with Jobmanager actor system quarantined:
>>
>> {"timeMillis":1539282282329,"thread":"flink-akka.actor.default-dispatcher-3","level":"ERROR","loggerName":"org.apache.flink.runtime.taskmanager.TaskManager","message":"The
>> actor system akka.tcp://flink@taskmgr-6b59f97748-fmgwn:8070 has
>> quarantined the remote actor system akka.tcp://flink@192.168.83.52:6123.
>> Shutting the actor system down to be able to reestablish a
>> connection!","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":49,"threadPriority":5}
>>
>>
>> A manual restart by docker restart or killing the JVM doesn't reproduce
>> this problem.
>>
>> On Thu, Oct 11, 2018 at 11:15 AM Abdul Qadeer <quadeer.leo@gmail.com>
>> wrote:
>>
>>> Hi Till,
>>>
>>> I didn't try with newer versions as it is not possible to update the
>>> Flink version atm.
>>> If you could give any pointers for debugging that would be great.
>>>
>>> On Thu, Oct 11, 2018 at 2:44 AM Till Rohrmann <trohrmann@apache.org>
>>> wrote:
>>>
>>>> Hi Abdul,
>>>>
>>>> have you tried whether this problem also occurs with newer Flink
>>>> versions (1.5.4 or 1.6.1)?
>>>>
>>>> Cheers,
>>>> Till
>>>>
>>>> On Thu, Oct 11, 2018 at 9:24 AM Dawid Wysakowicz <
>>>> dwysakowicz@apache.org> wrote:
>>>>
>>>>> Hi Abdul,
>>>>>
>>>>> I've added Till and Gary to cc, who might be able to help you.
>>>>>
>>>>> Best,
>>>>>
>>>>> Dawid
>>>>>
>>>>> On 11/10/18 03:05, Abdul Qadeer wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>>
>>>>> We are facing an issue in standalone HA mode in Flink 1.4.0 where
>>>>> Taskmanager restarts and is not able to register with the Jobmanager.
It
>>>>> times out awaiting *AcknowledgeRegistration/AlreadyRegistered*
>>>>> message from Jobmanager Actor and keeps sending *RegisterTaskManager
*message.
>>>>> The logs at Jobmanager don’t show anything about registration
>>>>> failure/request. It doesn’t print *log*.debug(*s"RegisterTaskManager:
>>>>> $*msg*"*) (from JobManager.scala) either. The network connection
>>>>> between taskmanager and jobmanager seems fine; tcpdump shows message
sent
>>>>> to jobmanager and TCP ACK received from jobmanager. Note that the
>>>>> communication is happening between docker containers.
>>>>>
>>>>>
>>>>> Following are the logs from Taskmanager:
>>>>>
>>>>>
>>>>>
>>>>> {"timeMillis":1539189572438,"thread":"flink-akka.actor.default-dispatcher-2","level":"INFO","loggerName":"org.apache.flink.runtime.taskmanager.TaskManager","message":"Trying
>>>>> to register at JobManager akka.tcp://
>>>>> flink@192.168.83.51:6123/user/jobmanager (attempt 1400, timeout:
>>>>> 30000
>>>>> milliseconds)","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":48,"threadPriority":5}
>>>>>
>>>>> {"timeMillis":1539189580229,"thread":"Curator-Framework-0-SendThread(zookeeper.maglev-system.svc.cluster.local:2181)","level":"DEBUG","loggerName":"org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn","message":"Got
>>>>> ping response for sessionid: 0x10000260ea5002d after
>>>>> 0ms","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":101,"threadPriority":5}
>>>>>
>>>>> {"timeMillis":1539189600247,"thread":"Curator-Framework-0-SendThread(zookeeper.maglev-system.svc.cluster.local:2181)","level":"DEBUG","loggerName":"org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn","message":"Got
>>>>> ping response for sessionid: 0x10000260ea5002d after
>>>>> 0ms","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":101,"threadPriority":5}
>>>>>
>>>>> {"timeMillis":1539189602458,"thread":"flink-akka.actor.default-dispatcher-2","level":"INFO","loggerName":"org.apache.flink.runtime.taskmanager.TaskManager","message":"Trying
>>>>> to register at JobManager akka.tcp://
>>>>> flink@192.168.83.51:6123/user/jobmanager (attempt 1401, timeout:
>>>>> 30000
>>>>> milliseconds)","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":48,"threadPriority":5}
>>>>>
>>>>> {"timeMillis":1539189620251,"thread":"Curator-Framework-0-SendThread(zookeeper.maglev-system.svc.cluster.local:2181)","level":"DEBUG","loggerName":"org.apache.flink.shaded.zookeeper.org.apache.zookeeper.ClientCnxn","message":"Got
>>>>> ping response for sessionid: 0x10000260ea5002d after
>>>>> 0ms","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":101,"threadPriority":5}
>>>>>
>>>>> {"timeMillis":1539189632478,"thread":"flink-akka.actor.default-dispatcher-2","level":"INFO","loggerName":"org.apache.flink.runtime.taskmanager.TaskManager","message":"Trying
>>>>> to register at JobManager akka.tcp://
>>>>> flink@192.168.83.51:6123/user/jobmanager (attempt 1402, timeout:
>>>>> 30000
>>>>> milliseconds)","endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","threadId":48,"threadPriority":5}
>>>>>
>>>>>
>>>>>

Mime
View raw message