Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4763#discussion_r143662806
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/messages/checkpoints/CheckpointStatistics.java
---
@@ -0,0 +1,534 @@
+/*
+ * 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.runtime.rest.messages.checkpoints;
+
+import org.apache.flink.runtime.checkpoint.AbstractCheckpointStats;
+import org.apache.flink.runtime.checkpoint.CheckpointStatsStatus;
+import org.apache.flink.runtime.checkpoint.CompletedCheckpointStats;
+import org.apache.flink.runtime.checkpoint.FailedCheckpointStats;
+import org.apache.flink.runtime.checkpoint.TaskStateStats;
+import org.apache.flink.runtime.jobgraph.JobVertexID;
+import org.apache.flink.runtime.rest.messages.ResponseBody;
+import org.apache.flink.runtime.rest.messages.json.JobVertexIDDeserializer;
+import org.apache.flink.runtime.rest.messages.json.JobVertexIDSerializer;
+import org.apache.flink.util.Preconditions;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+
+import javax.annotation.Nullable;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+/**
+ * Statistics for a checkpoint.
+ */
+@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include =
JsonTypeInfo.As.PROPERTY, property = "@class")
+@JsonSubTypes({
+ @JsonSubTypes.Type(value =
CheckpointStatistics.CompletedCheckpointStatistics.class, name = "completed"),
+ @JsonSubTypes.Type(value =
CheckpointStatistics.FailedCheckpointStatistics.class, name = "failed")})
+@JsonInclude(JsonInclude.Include.NON_NULL)
--- End diff --
I will remove the Include.NON_NULL directive and re-add the
FAIL_ON_MISSING_CREATOR_PROPERTY to the `ObjectMapper`.
---
