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https://issues.apache.org/jira/browse/FLINK-10415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16630478#comment-16630478
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ASF GitHub Bot commented on FLINK-10415:
----------------------------------------
tillrohrmann commented on a change in pull request #6763: [FLINK-10415] Fail
response future if connection closes in RestClient
URL: https://github.com/apache/flink/pull/6763#discussion_r220936630
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/RestClient.java
##########
@@ -339,12 +338,26 @@ private static Request createRequest(String
targetAddress, String targetUrl, Htt
.thenComposeAsync(
channel -> {
ClientHandler handler =
channel.pipeline().get(ClientHandler.class);
- CompletableFuture<JsonResponse> future
= handler.getJsonFuture();
+
+ CompletableFuture<JsonResponse> future;
+ boolean success = false;
+
try {
- httpRequest.writeTo(channel);
+ if (handler == null) {
+ throw new
IOException("Netty pipeline was not properly initialized.");
+ } else {
+
httpRequest.writeTo(channel);
+ future =
handler.getJsonFuture();
+ success = true;
+ }
} catch (IOException e) {
- return
FutureUtils.completedExceptionally(new FlinkException("Could not write
request.", e));
+ future =
FutureUtils.completedExceptionally(new ConnectionException("Could not write
request.", e));
+ } finally {
+ if (!success) {
+ channel.close();
Review comment:
We keep the channel open if we managed to send the request to the remote
endpoint, because we expect an answer. In all other cases (`!success`) we
should close it, because we cannot expect something to return.
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> RestClient does not react to lost connection
> --------------------------------------------
>
> Key: FLINK-10415
> URL: https://issues.apache.org/jira/browse/FLINK-10415
> Project: Flink
> Issue Type: Bug
> Components: REST
> Affects Versions: 1.6.1, 1.7.0, 1.5.4
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.7.0, 1.6.2, 1.5.5
>
>
> While working on FLINK-10403, I noticed that Flink's {{RestClient}} does not
> seem to react to a lost connections in time. When sending a request to the
> current leader it happened that the leader was killed just after establishing
> the connection. Then the {{RestClient}} did not fail the connection and was
> stuck in writing a request or retrieving a response from the lost leader. I'm
> wondering whether we should introduce a {{ReadTimeoutHandler}} and
> {{WriteTimeoutHandler}} to handle these problems.
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