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From GitBox <...@apache.org>
Subject [GitHub] [flink] zhijiangW commented on a change in pull request #8320: [FLINK-12201][network][metrics] Introduce InputGateWithMetrics in Task to increment numBytesIn metric
Date Fri, 10 May 2019 09:26:01 GMT
zhijiangW commented on a change in pull request #8320: [FLINK-12201][network][metrics] Introduce
InputGateWithMetrics in Task to increment numBytesIn metric
URL: https://github.com/apache/flink/pull/8320#discussion_r282811035

 File path: flink-runtime/src/main/java/org/apache/flink/runtime/taskmanager/InputGateWithMetrics.java
 @@ -0,0 +1,119 @@
+ * 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.taskmanager;
+import org.apache.flink.metrics.Counter;
+import org.apache.flink.runtime.event.TaskEvent;
+import org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent;
+import org.apache.flink.runtime.io.network.partition.consumer.InputGate;
+import org.apache.flink.runtime.io.network.partition.consumer.InputGateListener;
+import org.apache.flink.runtime.metrics.groups.TaskIOMetricGroup;
+import java.io.IOException;
+import java.util.Optional;
+import static org.apache.flink.util.Preconditions.checkNotNull;
+ * The InputGateWithMetrics is wrapped in task with {@link InputGate} provided by
+ * shuffle service. It is mainly used for increasing general input metrics from
+ * {@link TaskIOMetricGroup}.
+ */
+public class InputGateWithMetrics implements InputGate, InputGateListener {
 Review comment:
   I also not considered this issue before, only found it when existing ITCase fails.
   The `UnionInputGate` could only see `InputGateWithMetrics` and then put them into internal
`inputGateToIndexOffsetMap`. When the `SingleInputGate` receives data from network, it would
notify the listener(`UnionInputGate`) and then the `SingleInputGate` would be added into `UnionInputGate#inputGatesWithData`.
When `UnionInputGate#getNextBufferOrEvent`, the `SingleInputGate` is fetched from `inputGatesWithData`,
but it can not be found from `inputGateToIndexOffsetMap` which would cause NPE issue.

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