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https://issues.apache.org/jira/browse/FLINK-18663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17162028#comment-17162028
]
tartarus commented on FLINK-18663:
----------------------------------
[~chesnay] thanks for your reply.
This problem does not occur frequently, but when the JM load is too high, such
as GC，call /jobs/overview maybe happen exception
{code:java}
2020-07-21 12:39:21,458 WARN
org.apache.flink.runtime.rest.handler.job.JobsOverviewHandler[flink-scheduler-1]
- ##### requestProcessingFuture url = /jobs/overview, throwable
java.util.concurrent.CompletionException: akka.pattern.AskTimeoutException: Ask
timed out on [Actor[akka://flink/user/dispatcher#-919763123]] after [10000 ms].
Message of type [org.apache.flink.runtime.rpc.messages.LocalFencedMessage]. A
typical reason for `AskTimeoutException` is that
the recipient actor didn't send a reply.
at
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
at
java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
at
java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593)
at
java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
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$1.onComplete(FutureUtils.java:878)
at akka.dispatch.OnComplete.internal(Future.scala:263)
at akka.dispatch.OnComplete.internal(Future.scala:261)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:191)
at akka.dispatch.japi$CallbackBridge.apply(Future.scala:188)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
at
org.apache.flink.runtime.concurrent.Executors$DirectExecutionContext.execute(Executors.java:74)
at
scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:44)
at
scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:252)
at
akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:644)
at akka.actor.Scheduler$$anon$4.run(Scheduler.scala:205)
at
scala.concurrent.Future$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:328)
at
akka.actor.LightArrayRevolverScheduler$$anon$4.executeBucket$1(LightArrayRevolverScheduler.scala:279)
at
akka.actor.LightArrayRevolverScheduler$$anon$4.nextTick(LightArrayRevolverScheduler.scala:283)
at
akka.actor.LightArrayRevolverScheduler$$anon$4.run(LightArrayRevolverScheduler.scala:235)
at java.lang.Thread.run(Thread.java:745)
Caused by: akka.pattern.AskTimeoutException: Ask timed out on
[Actor[akka://flink/user/dispatcher#-919763123]] after [10000 ms]. Message of
type [org.apache.flink.runtime.rpc.messages.LocalFencedMessage]. A typical
reason for `AskTimeoutException` is that the recipient actor didn't sen
d a reply.
at akka.pattern.PromiseActorRef$$anonfun$2.apply(AskSupport.scala:635)
at akka.pattern.PromiseActorRef$$anonfun$2.apply(AskSupport.scala:635)
at
akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:648)
... 9 more
{code}
there seem to be few changes to netty, but FLINK-16626.
We found that the problem was indeed when canceling the flink job.
there are some debug info, Handling exceptions under normal circumstances
!110.png!
When abnormal
!111.png!
> Fix Flink On YARN AM not exit
> -----------------------------
>
> Key: FLINK-18663
> URL: https://issues.apache.org/jira/browse/FLINK-18663
> Project: Flink
> Issue Type: Bug
> Components: Runtime / REST
> Affects Versions: 1.10.0, 1.10.1, 1.11.0
> Reporter: tartarus
> Priority: Major
> Labels: pull-request-available
> Attachments: 110.png, 111.png,
> C49A7310-F932-451B-A203-6D17F3140C0D.png, e18e00dd6664485c2ff55284fe969474.png
>
>
> AbstractHandler throw NPE cause by FlinkHttpObjectAggregator is null
> when rest throw exception, it will do this code
> {code:java}
> private CompletableFuture<Void> handleException(Throwable throwable,
> ChannelHandlerContext ctx, HttpRequest httpRequest) {
> FlinkHttpObjectAggregator flinkHttpObjectAggregator =
> ctx.pipeline().get(FlinkHttpObjectAggregator.class);
> int maxLength = flinkHttpObjectAggregator.maxContentLength() -
> OTHER_RESP_PAYLOAD_OVERHEAD;
> if (throwable instanceof RestHandlerException) {
> RestHandlerException rhe = (RestHandlerException) throwable;
> String stackTrace = ExceptionUtils.stringifyException(rhe);
> String truncatedStackTrace = Ascii.truncate(stackTrace,
> maxLength, "...");
> if (log.isDebugEnabled()) {
> log.error("Exception occurred in REST handler.", rhe);
> } else {
> log.error("Exception occurred in REST handler: {}",
> rhe.getMessage());
> }
> return HandlerUtils.sendErrorResponse(
> ctx,
> httpRequest,
> new ErrorResponseBody(truncatedStackTrace),
> rhe.getHttpResponseStatus(),
> responseHeaders);
> } else {
> log.error("Unhandled exception.", throwable);
> String stackTrace = String.format("<Exception on server
> side:%n%s%nEnd of exception on server side>",
> ExceptionUtils.stringifyException(throwable));
> String truncatedStackTrace = Ascii.truncate(stackTrace,
> maxLength, "...");
> return HandlerUtils.sendErrorResponse(
> ctx,
> httpRequest,
> new ErrorResponseBody(Arrays.asList("Internal server
> error.", truncatedStackTrace)),
> HttpResponseStatus.INTERNAL_SERVER_ERROR,
> responseHeaders);
> }
> }
> {code}
> but flinkHttpObjectAggregator some case is null,so this will throw NPE,but
> this method called by AbstractHandler#respondAsLeader
> {code:java}
> requestProcessingFuture
> .whenComplete((Void ignored, Throwable throwable) -> {
> if (throwable != null) {
>
> handleException(ExceptionUtils.stripCompletionException(throwable), ctx,
> httpRequest)
> .whenComplete((Void ignored2, Throwable
> throwable2) -> finalizeRequestProcessing(finalUploadedFiles));
> } else {
> finalizeRequestProcessing(finalUploadedFiles);
> }
> });
> {code}
> the result is InFlightRequestTracker Cannot be cleared.
> so the CompletableFuture does‘t complete that handler's closeAsync returned
> !C49A7310-F932-451B-A203-6D17F3140C0D.png!
> !e18e00dd6664485c2ff55284fe969474.png!
>
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