wangyang0918 commented on a change in pull request #11639:
[FLINK-16626][runtime] Prevent REST handler from being closed more than once
URL: https://github.com/apache/flink/pull/11639#discussion_r405952615
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/AbstractHandler.java
##########
@@ -221,7 +227,12 @@ private void finalizeRequestProcessing(FileUploads
uploadedFiles) {
@Override
public final CompletableFuture<Void> closeAsync() {
- return FutureUtils.composeAfterwards(closeHandlerAsync(),
inFlightRequestTracker::awaitAsync);
+ if (isHandlerClosed.compareAndSet(false, true)) {
+ return
FutureUtils.composeAfterwards(closeHandlerAsync(),
inFlightRequestTracker::awaitAsync);
+ } else {
+ log.warn("The handler instance for {} had already been
closed, but another attempt at closing it was made.",
untypedResponseMessageHeaders.getTargetRestEndpointURL());
+ return CompletableFuture.completedFuture(null);
Review comment:
@keijiyoshida I agree with you that the root cause is accidentally reusing
the handler instance. However, we have checked the duplication in
`RestServerEndpoint`, i am just think whether we still need to have the
defensive logics here.
I do not insist of this. You could determine by yourself.
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