fapaul commented on a change in pull request #18330:
URL: https://github.com/apache/flink/pull/18330#discussion_r784741404



##########
File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/connector/sink2/CommittableSummary.java
##########
@@ -0,0 +1,87 @@
+/*
+ * 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.streaming.api.connector.sink2;
+
+import org.apache.flink.annotation.Experimental;
+
+import javax.annotation.Nullable;
+
+import java.util.OptionalLong;
+
+/**
+ * This class tracks the information about committables belonging to one 
checkpoint coming from one
+ * subtask.
+ *
+ * <p>It is sent to down-stream consumers to depict the progress of the 
committing process.
+ *
+ * @param <CommT> type of the committable
+ */
+@Experimental
+public class CommittableSummary<CommT> implements CommittableMessage<CommT> {
+    private final int subtaskId;
+    /** May change after recovery. */
+    private final int numberOfSubtasks;
+
+    @Nullable private final Long checkpointId;
+    /** The number of committables coming from the given subtask in the 
particular checkpoint. */
+    private final int numberOfCommittables;
+    /** The number of committables that have not been successfully committed. 
*/
+    private final int numberOfPendingCommittables;
+    /** The number of committables that are not retried and have been failed. 
*/
+    private final int numberOfFailedCommittables;
+
+    public CommittableSummary(

Review comment:
       I agree that having 5 parameters with the same type is not ideal but I 
also do not like a builder because for me a builder implies that you have many 
nullable fields or defaults.
   
   On the other hand, I do not expect users to instantiate this class because 
the main intention is that they can consume the message sent by the 
writer/committer. 




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