Sanil15 commented on code in PR #22576:
URL: https://github.com/apache/beam/pull/22576#discussion_r944699404


##########
runners/samza/src/main/java/org/apache/beam/runners/samza/util/SamzaExceptionListener.java:
##########
@@ -0,0 +1,54 @@
+/*
+ * 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.beam.runners.samza.util;
+
+import java.beans.PropertyChangeListener;
+import java.beans.PropertyChangeSupport;
+import java.util.Map;
+
+/**
+ * An ExceptionListener following Observer pattern. Any class implementing 
{@code
+ * PropertyChangeListener} can be registered with SamzaExceptionListener. Any 
runtime exception
+ * caught by {@code OpAdapter} will be notified to all registered 
PropertyChangeListener(s) as a
+ * {@code PropertyChangeEvent}
+ */
+public class SamzaExceptionListener {
+  private PropertyChangeSupport support;
+  private static final SamzaExceptionListener singletonExceptionListener =
+      new SamzaExceptionListener();

Review Comment:
   good call, used the same pattern as SamzaPipelineLifeCycleListener with 
autoservice to wire in Exception listeners



##########
runners/samza/src/main/java/org/apache/beam/runners/samza/runtime/Op.java:
##########
@@ -61,4 +61,8 @@ default void processSideInputWatermark(Instant watermark, 
OpEmitter<OutT> emitte
   default void processTimer(KeyedTimerData<K> keyedTimerData, OpEmitter<OutT> 
emitter) {}
 
   default void close() {}
+
+  default String getFullOpName() {

Review Comment:
   fixed



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