[jira] [Commented] (FLINK-10671) rest monitoring api Savepoint status call fails if akka.ask.timeout < checkpoint duration

["Gary Yao (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16674975#comment-16674975 ] 

Gary Yao commented on FLINK-10671:
----------------------------------

[~cresny@gmail.com], could it be that you are using 1.6.0? This looks like a duplicate of FLINK-10193, which got fixed in 1.6.1. I am unable to reproduce the problem in 1.6.1 using the {{SlowToCheckpoint}} job that is attached to FLINK-10193. The job artificially slows down the {{snapshotState}} callback by a configurable amount of time.

flink-conf.yaml
{noformat}
akka.ask.timeout: 20 s
{noformat}

Commands to submit and take savepoint:
{code}
bin/flink run -d -c com.github.uce.SlowToCheckpoint testjob.jar --checkpointDuration 45000
bin/flink cancel -s file:///tmp/flink-savepoints <job-id>
{code}

If your version is indeed 1.6.1, please add more information on how to reproduce the problem (preferably using the {{SlowToCheckpoint}} job).

> rest monitoring api Savepoint status call fails if akka.ask.timeout < checkpoint duration
> -----------------------------------------------------------------------------------------
>
>                 Key: FLINK-10671
>                 URL: https://issues.apache.org/jira/browse/FLINK-10671
>             Project: Flink
>          Issue Type: Bug
>          Components: REST
>    Affects Versions: 1.6.1
>            Reporter: Cliff Resnick
>            Assignee: Gary Yao
>            Priority: Minor
>
> Hi,
>  
> There seems to be a problem with REST monitoring API:
> |/jobs/:jobid/savepoints/:triggerid|
>  
> The problem is that when the Savepoint represented by :triggerid is called with `cancel=true` the above status call seems to fail if the savepoint duration exceeds `akka.ask.timeout` value.
>  
> Below is a log in which I invoke "cancel with savepoint" then poll the above endpoint for status at 2 second intervals. akka.ask.timout is set for twenty seconds. The error is repeatable at various values of akka.ask.timeout.
>  
> 2018/10/24 19:42:25 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:27 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:29 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:31 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:33 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:35 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:37 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:39 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:41 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:43 savepoint id 925964b35b2d501f4a45b714eca0a2ca is IN_PROGRESS
> 2018/10/24 19:42:45 Cancel with Savepoint may have failed: java.util.concurrent.CompletionException: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://flink/user/jobmanager_0#-234856817]] after [20000 ms]. Sender[null] sent message of type "org.apache.flink.runtime.rpc.messages.LocalFencedMessage".
> at java.util.concurrent.CompletableFuture.encodeRelay(CompletableFuture.java:326)
> at java.util.concurrent.CompletableFuture.completeRelay(CompletableFuture.java:338)
> at java.util.concurrent.CompletableFuture.uniRelay(CompletableFuture.java:911)
> at java.util.concurrent.CompletableFuture$UniRelay.tryFire(CompletableFuture.java:899)
> at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
> at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
> at org.apache.flink.runtime.concurrent.FutureUtils$1.onComplete(FutureUtils.java:770)
> at akka.dispatch.OnComplete.internal(Future.scala:258)
> at akka.dispatch.OnComplete.internal(Future.scala:256)
> at akka.dispatch.japi$CallbackBridge.apply(Future.scala:186)
> at akka.dispatch.japi$CallbackBridge.apply(Future.scala:183)
> at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
> at org.apache.flink.runtime.concurrent.Executors$DirectExecutionContext.execute(Executors.java:83)
> at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:44)
> at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:252)
> at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:603)
> at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:126)
> at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:601)
> at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:109)
> at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:599)
> at akka.actor.LightArrayRevolverScheduler$TaskHolder.executeTask(LightArrayRevolverScheduler.scala:329)
> at akka.actor.LightArrayRevolverScheduler$$anon$4.executeBucket$1(LightArrayRevolverScheduler.scala:280)
> at akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:284)
> at akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:236)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://flink/user/jobmanager_0#-234856817]] after [20000 ms]. Sender[null] sent message of type "org.apache.flink.runtime.rpc.messages.LocalFencedMessage".
> at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:604)
> ... 9 more



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