Re: Kubernetes HA - attempting to restore from wrong (non-existing) savepoint

Posted by Alexey Trenikhun on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Kubernetes-HA-attempting-to-restore-from-wrong-non-existing-savepoint-tp41753p42404.html

Hi Yang,

I think I've reproduced the problem - job was cancelled, however something went wrong, JM exited with code 2, and as result Kubernetes restarted JM pod. JM log is attached.

Thanks,

Alexey

---

From: Yang Wang <[hidden email]>
Sent: Monday, March 15, 2021 1:26 AM
To: Alexey Trenikhun <[hidden email]>
Cc: Flink User Mail List <[hidden email]>
Subject: Re: Kubernetes HA - attempting to restore from wrong (non-existing) savepoint

 

Feel free to share the terminated JobManager logs if you could reproduce this issue again.

Maybe "kubectl logs {pod_name} --previous" could help.

Best,

Yang

Alexey Trenikhun <[hidden email]> 于2021年3月15日周一 下午2:28写道：

With 1.12.1 it happened quite often, with 1.12.2 not that match, I think I saw it once or twice for ~20 cancels, when it happened, job actually restarted on cancel, did not grab log at that time, but chances good that I will able to reproduce. 

Thanks,

Alexey

---

From: Yang Wang <[hidden email]>
Sent: Sunday, March 14, 2021 7:50:21 PM
To: Alexey Trenikhun <[hidden email]>
Cc: Flink User Mail List <[hidden email]>
Subject: Re: Kubernetes HA - attempting to restore from wrong (non-existing) savepoint

 

If the HA related ConfigMaps still exists, then I am afraid the data located on the distributed storage should also exist.

So I suggest to delete the HA related storage as well.

Delete all the HA related data manually should help in your current situation. After then you could recover from the new savepoint.

However, I do not think this is a normal behavior. Since when the application reached the terminal state(e.g. FINISHED, FAILED, CANCELLED),

all HA related data should be cleaned up automatically.

Could you help to provide the JobManager logs when you are trying to cancel the job? I believe using `kubectl logs -f {pod_name}` could dump

the logs in real time.

Best,

Yang

Alexey Trenikhun <[hidden email]> 于2021年3月12日周五 上午12:47写道：

Hi Yang,

Upgrade procedure uses POST /jobs/:jobid/savepoints with cancel-job=true, but perhaps I hit FLINK-21028. This lead to question, if normal via API take-savepoint-and-cancel-job fails, what steps should be done outside Flink to be able to resume from savepoint with new job version? Is deleting Kubernetes Job and HA configmaps enough, or something in persisted storage should be deleted as well?

Thanks,

Alexey

---

From: Yang Wang <[hidden email]>
Sent: Thursday, March 11, 2021 2:59 AM
To: Alexey Trenikhun <[hidden email]>
Cc: Flink User Mail List <[hidden email]>
Subject: Re: Kubernetes HA - attempting to restore from wrong (non-existing) savepoint

 

Hi Alexey,

From your attached logs, it seems that the leader related config map is reused.

Then the Flink application is recovered instead of submitting a new one. This is

the root cause it is trying to recover from a wrong savepoint which is specified in

your last submission.

> So how to fix this?

If you want to stop the application, I strongly suggest to cancel the flink job with savepoint

instead of directly deleting all the K8s resources. After then, you will find that the leader

related config maps will be deleted automatically after the job is cancelled.

Best,

Yang

Alexey Trenikhun <[hidden email]> 于2021年3月10日周三 下午12:16写道：

Hi Yang,

The problem is re-occurred, full JM log is attached

Thanks,

Alexey

---

From: Yang Wang <[hidden email]>
Sent: Sunday, February 28, 2021 10:04 PM
To: Alexey Trenikhun <[hidden email]>
Cc: Flink User Mail List <[hidden email]>
Subject: Re: Kubernetes HA - attempting to restore from wrong (non-existing) savepoint

 

Hi Alexey,

It seems that the KubernetesHAService works well since all the checkpoints have been cleaned up when the job is canceled.

And we could find related logs "Found 0 checkpoints in KubernetesStateHandleStore{configMapName='gsp-00000000000000000000000000000000-jobmanager-leader'}.".

However, it is a little strange that the CheckpointCoordinator is recovering from a wrong savepoint path. Could you share the

full JobManager logs? One possible reason I could guess is the application cluster entrypoint is not creating a new JobGraph from the specified arguments.

Best,

Yang 

Alexey Trenikhun <[hidden email]> 于2021年2月27日周六 上午1:48写道：

Hello,

We have Flink job running in Kubernetes with Kuberenetes HA enabled (JM is deployed as Job, single TM as StatefulSet). We taken savepoint with cancel=true. Now when we are trying to start job using --fromSavepoint A, where is A path we got from taking savepoint (ClusterEntrypoint reports A in log), but looks like Job for some reason ignores given A and actually trying to restore from some path B (CheckpointCoordinator logs B ):

{"ts":"2021-02-26T17:09:52.500Z","message":" Program Arguments:","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    --configDir","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    /opt/flink/conf","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    --fromSavepoint","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    wasbs://gsp-state@.../gsp/savepoints/savepoint-000000-e8a201008f2c","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    --job-classname","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    com.App","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.501Z","message":"    --job-id","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:52.502Z","message":"    00000000000000000000000000000000","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"main","level":"INFO","level_value":20000} 

...

{"ts":"2021-02-26T17:09:59.176Z","message":"Recovering checkpoints from KubernetesStateHandleStore{configMapName='gsp-00000000000000000000000000000000-jobmanager-leader'}.","logger_name":"org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStore","thread_name":"cluster-io-thread-4","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.181Z","message":"Found 0 checkpoints in KubernetesStateHandleStore{configMapName='gsp-00000000000000000000000000000000-jobmanager-leader'}.","logger_name":"org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStore","thread_name":"cluster-io-thread-4","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.183Z","message":"All 0 checkpoints found are already downloaded.","logger_name":"org.apache.flink.runtime.checkpoint.DefaultCompletedCheckpointStore","thread_name":"cluster-io-thread-4","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.183Z","message":"No checkpoint found during restore.","logger_name":"org.apache.flink.runtime.checkpoint.CheckpointCoordinator","thread_name":"cluster-io-thread-4","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.183Z","message":"Starting job 00000000000000000000000000000000 from savepoint wasbs://gsp-state@.../gsp/savepoints/savepoint-000000-fbcd58f66685 (allowing non restored state)","logger_name":"org.apache.flink.runtime.checkpoint.CheckpointCoordinator","thread_name":"cluster-io-thread-4","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.191Z","message":"0.0.7+g9bb29061\n  build 2021-02-21T21:13:31-0800\n  tag: 0.0.0.7\n  id: 0.0.0.7\n","logger_name":"com.Fsp","thread_name":"flink-akka.actor.default-dispatcher-2","level":"INFO","level_value":20000}

{"ts":"2021-02-26T17:09:59.273Z","message":"Fatal error occurred in the cluster entrypoint.","logger_name":"org.apache.flink.runtime.entrypoint.ClusterEntrypoint","thread_name":"flink-akka.actor.default-dispatcher-4","level":"ERROR","level_value":40000,"stack_trace":"org.apache.flink.util.FlinkException: JobMaster for job 00000000000000000000000000000000 failed.\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.jobMasterFailed(Dispatcher.java:890)\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.dispatcherJobFailed(Dispatcher.java:465)\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.handleDispatcherJobResult(Dispatcher.java:444)\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.lambda$runJob$3(Dispatcher.java:423)\n\tat java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:836)\n\tat java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:811)\n\tat java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:456)\n\tat org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRunAsync(AkkaRpcActor.java:442)\n\tat org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcMessage(AkkaRpcActor.java:209)\n\tat org.apache.flink.runtime.rpc.akka.FencedAkkaRpcActor.handleRpcMessage(FencedAkkaRpcActor.java:77)\n\tat org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleMessage(AkkaRpcActor.java:159)\n\tat akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26)\n\tat akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21)\n\tat scala.PartialFunction.applyOrElse(PartialFunction.scala:123)\n\tat scala.PartialFunction.applyOrElse$(PartialFunction.scala:122)\n\tat akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21)\n\tat scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:171)\n\tat scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)\n\tat scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:172)\n\tat akka.actor.Actor.aroundReceive(Actor.scala:517)\n\tat akka.actor.Actor.aroundReceive$(Actor.scala:515)\n\tat akka.actor.AbstractActor.aroundReceive(AbstractActor.scala:225)\n\tat akka.actor.ActorCell.receiveMessage(ActorCell.scala:592)\n\tat akka.actor.ActorCell.invoke(ActorCell.scala:561)\n\tat akka.dispatch.Mailbox.processMailbox(Mailbox.scala:258)\n\tat akka.dispatch.Mailbox.run(Mailbox.scala:225)\n\tat akka.dispatch.Mailbox.exec(Mailbox.scala:235)\n\tat akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)\n\tat akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)\n\tat akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)\n\tat akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)\nCaused by: org.apache.flink.runtime.client.JobInitializationException: Could not instantiate JobManager.\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.lambda$createJobManagerRunner$5(Dispatcher.java:494)\n\tat java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\n\tat java.lang.Thread.run(Thread.java:748)\nCaused by: java.io.FileNotFoundException: Cannot find checkpoint or savepoint file/directory 'wasbs://gsp-state@.../gsp/savepoints/savepoint-000000-fbcd58f66685' on file system 'wasbs'.\n\tat org.apache.flink.runtime.state.filesystem.AbstractFsCheckpointStorageAccess.resolveCheckpointPointer(AbstractFsCheckpointStorageAccess.java:250)\n\tat org.apache.flink.runtime.state.filesystem.AbstractFsCheckpointStorageAccess.resolveCheckpoint(AbstractFsCheckpointStorageAccess.java:111)\n\tat org.apache.flink.runtime.checkpoint.CheckpointCoordinator.restoreSavepoint(CheckpointCoordinator.java:1632)\n\tat org.apache.flink.runtime.scheduler.SchedulerBase.tryRestoreExecutionGraphFromSavepoint(SchedulerBase.java:358)\n\tat org.apache.flink.runtime.scheduler.SchedulerBase.createAndRestoreExecutionGraph(SchedulerBase.java:288)\n\tat org.apache.flink.runtime.scheduler.SchedulerBase.<init>(SchedulerBase.java:245)\n\tat org.apache.flink.runtime.scheduler.DefaultScheduler.<init>(DefaultScheduler.java:133)\n\tat org.apache.flink.runtime.scheduler.DefaultSchedulerFactory.createInstance(DefaultSchedulerFactory.java:111)\n\tat org.apache.flink.runtime.jobmaster.JobMaster.createScheduler(JobMaster.java:345)\n\tat org.apache.flink.runtime.jobmaster.JobMaster.<init>(JobMaster.java:330)\n\tat org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.createJobMasterService(DefaultJobMasterServiceFactory.java:95)\n\tat org.apache.flink.runtime.jobmaster.factories.DefaultJobMasterServiceFactory.createJobMasterService(DefaultJobMasterServiceFactory.java:39)\n\tat org.apache.flink.runtime.jobmaster.JobManagerRunnerImpl.<init>(JobManagerRunnerImpl.java:162)\n\tat org.apache.flink.runtime.dispatcher.DefaultJobManagerRunnerFactory.createJobManagerRunner(DefaultJobManagerRunnerFactory.java:86)\n\tat org.apache.flink.runtime.dispatcher.Dispatcher.lambda$createJobManagerRunner$5(Dispatcher.java:478)\n\t... 4 common frames omitted\n"}

Any suggestions?

Thanks,
Alexey