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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10309) Cancel flink job occurs java.net.ConnectException
Date Mon, 08 Oct 2018 13:34:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641836#comment-16641836
] 

ASF GitHub Bot commented on FLINK-10309:
----------------------------------------

zentol commented on a change in pull request #6785: [FLINK-10309][rest] Before shutting down
cluster, wait for asynchronous operations
URL: https://github.com/apache/flink/pull/6785#discussion_r223364545
 
 

 ##########
 File path: flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/AbstractRestHandler.java
 ##########
 @@ -75,19 +82,19 @@ protected AbstractRestHandler(
 
 	@Override
 	protected CompletableFuture<Void> respondToRequest(ChannelHandlerContext ctx, HttpRequest
httpRequest, HandlerRequest<R, M> handlerRequest, T gateway) {
-		CompletableFuture<P> response;
+		final CompletableFuture<P> response = handleRequestInternal(handlerRequest, gateway);
 
-		try {
-			response = handleRequest(handlerRequest, gateway);
-		} catch (RestHandlerException e) {
-			response = FutureUtils.completedExceptionally(e);
-		}
+		return response.whenCompleteAsync((P resp, Throwable throwable) -> {
+				inFlightRequestTracker.deregisterRequest();
 
-		return response.whenComplete((P resp, Throwable throwable) -> {
-			Tuple2<ResponseBody, HttpResponseStatus> r = throwable != null ?
-				errorResponse(throwable) : Tuple2.of(resp, messageHeaders.getResponseStatusCode());
-			HandlerUtils.sendResponse(ctx, httpRequest, r.f0, r.f1, responseHeaders);
-		}).thenApply(ignored -> null);
+				Tuple2<ResponseBody, HttpResponseStatus> r = throwable != null ?
+					errorResponse(throwable) : Tuple2.of(resp, messageHeaders.getResponseStatusCode());
+				HandlerUtils.sendResponse(ctx, httpRequest, r.f0, r.f1, responseHeaders);
+			},
+			// send response from Netty's EventExecutor so that the server channel
+			// does not close while we are responding to in-flight requests
+			ctx.executor())
 
 Review comment:
   under what circumstances would the server channel close? Does it simply close after a set
or timeout or ...?

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> Cancel flink job occurs java.net.ConnectException
> -------------------------------------------------
>
>                 Key: FLINK-10309
>                 URL: https://issues.apache.org/jira/browse/FLINK-10309
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Coordination, REST
>    Affects Versions: 1.5.3, 1.6.0, 1.7.0
>            Reporter: vinoyang
>            Assignee: Gary Yao
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.7.0, 1.6.2, 1.5.5
>
>
> The problem occurs when using the Yarn per-job detached mode. Trying to cancel with savepoint
fails with the following exception before being able to retrieve the savepoint path:
> exception stack trace : 
> {code:java}
> org.apache.flink.util.FlinkException: Could not cancel job xxxx.
>         at org.apache.flink.client.cli.CliFrontend.lambda$cancel$4(CliFrontend.java:585)
>         at org.apache.flink.client.cli.CliFrontend.runClusterAction(CliFrontend.java:960)
>         at org.apache.flink.client.cli.CliFrontend.cancel(CliFrontend.java:577)
>         at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1034)
>         at java.lang.Thread.run(Thread.java:748)
> Caused by: java.util.concurrent.ExecutionException: org.apache.flink.runtime.concurrent.FutureUtils$RetryException:
Could not complete the operation. Number of retries has been exhausted.
>         at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
>         at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
>         at org.apache.flink.client.program.rest.RestClusterClient.cancelWithSavepoint(RestClusterClient.java:398)
>         at org.apache.flink.client.cli.CliFrontend.lambda$cancel$4(CliFrontend.java:583)
>         ... 6 more
> Caused by: org.apache.flink.runtime.concurrent.FutureUtils$RetryException: Could not
complete the operation. Number of retries has been exhausted.
>         at org.apache.flink.runtime.concurrent.FutureUtils.lambda$retryOperationWithDelay$5(FutureUtils.java:213)
>         at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
>         at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
>         at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
>         at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
>         at org.apache.flink.runtime.rest.RestClient.lambda$submitRequest$1(RestClient.java:274)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:680)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:603)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:563)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:424)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:268)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:284)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
>         at org.apache.flink.shaded.netty4.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
>         ... 1 more
> Caused by: java.util.concurrent.CompletionException: java.net.ConnectException: Connect
refuse: xxx/xxx.xxx.xxx.xxx:xxx
>         at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
>         at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
>         at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:943)
>         at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
>         ... 16 more
> Caused by: java.net.ConnectException: Connect refuse: xxx/xxx.xxx.xxx.xxx:xxx
>         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>         at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
>         at org.apache.flink.shaded.netty4.io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:224)
>         at org.apache.flink.shaded.netty4.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:281)
>         ... 7 more
> {code}
> some discussion in mailing list : 
> http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/Cancel-flink-job-occur-exception-td24056.html



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