zentol 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_r404582514
##########
File path:
flink-clients/src/test/java/org/apache/flink/client/program/rest/RestClusterClientTest.java
##########
@@ -271,6 +273,24 @@ public void testDetachedJobSubmission() throws Exception {
}
+ /**
+ * Tests that ensure each handler is registered only once.
+ */
+ @Test
+ public void testDuplicatedHandlerRegistration() throws Exception {
+ final TestJobSubmitHandler testJobSubmitHandler = new
TestJobSubmitHandler();
+
+ assertThrows("Duplicate REST handler instance found. Please
ensure each instance is registered only once.",
+ FlinkRuntimeException.class,
+ () -> {
+ try (TestRestServerEndpoint restServerEndpoint
= createRestServerEndpoint(
+ testJobSubmitHandler,
testJobSubmitHandler)) {
+
createRestClusterClient(restServerEndpoint.getServerAddress().getPort());
Review comment:
Having this line obfuscates where the error is thrown. Any reader would
assume this line throws the exception; because there would be no need for it if
`createRestServerEndpoint` throws it.
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