TanYuxin-tyx commented on code in PR #22835:
URL: https://github.com/apache/flink/pull/22835#discussion_r1236654517


##########
flink-core/src/main/java/org/apache/flink/util/concurrent/IgnoreShutdownRejectedExecutionHandler.java:
##########
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.util.concurrent;
+
+import org.slf4j.Logger;
+
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ThreadPoolExecutor;
+
+/**
+ * Rejected executions are ignored or logged in debug if the executor is {@link
+ * java.util.concurrent.ThreadPoolExecutor#isShutdown shutdown}. Otherwise, 
{@link
+ * RejectedExecutionException} is thrown.
+ */
+public class IgnoreShutdownRejectedExecutionHandler implements 
RejectedExecutionHandler {
+    private final Logger logger;
+
+    public IgnoreShutdownRejectedExecutionHandler() {
+        this(null);
+    }
+
+    public IgnoreShutdownRejectedExecutionHandler(Logger logger) {
+        this.logger = logger;
+    }
+
+    @Override
+    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
+        if (executor.isShutdown()) {
+            if (logger != null) {
+                logger.debug("Execution rejected because shutdown is in 
progress");

Review Comment:
   "Execution is rejected" may be more appropriate.



##########
flink-core/src/main/java/org/apache/flink/util/concurrent/IgnoreShutdownRejectedExecutionHandler.java:
##########
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.util.concurrent;
+
+import org.slf4j.Logger;
+
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ThreadPoolExecutor;
+
+/**
+ * Rejected executions are ignored or logged in debug if the executor is {@link
+ * java.util.concurrent.ThreadPoolExecutor#isShutdown shutdown}. Otherwise, 
{@link
+ * RejectedExecutionException} is thrown.
+ */
+public class IgnoreShutdownRejectedExecutionHandler implements 
RejectedExecutionHandler {
+    private final Logger logger;

Review Comment:
   We'd better mark this logger as Nullable



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