Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18388#discussion_r124716883
--- Diff:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/protocol/OpenBlocksFailed.java
---
@@ -0,0 +1,84 @@
+/*
+ * 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.spark.network.shuffle.protocol;
+
+import com.google.common.base.Objects;
+import io.netty.buffer.ByteBuf;
+
+// Needed by ScalaDoc. See SPARK-7726
+import static
org.apache.spark.network.shuffle.protocol.BlockTransferMessage.Type;
+
+/**
+ * This message is responded from shuffle service when client failed to
"open blocks" due to
+ * some reason(e.g. the shuffle service is suffering from high memory
cost).
+ */
+public class OpenBlocksFailed extends BlockTransferMessage {
+
+ public final int reason;
+
+ public OpenBlocksFailed(int reason) {
+ this.reason = reason;
+ }
+
+ @Override
+ protected Type type() { return Type.OPEN_BLOCKS_FAILED; }
+
+ @Override
+ public int hashCode() {
+ return Objects.hashCode(reason);
+ }
+
+ public String toString() {
+ String reasonStr = null;
+ switch (reason) {
+ case 1:
+ reasonStr = "shuffle service is suffering high memory cost";
+ break;
+ default:
+ reasonStr = "unknown";
+ break;
+ }
+ return Objects.toStringHelper(this)
+ .add("reason", reasonStr)
+ .toString();
+ }
+
+ @Override
+ public boolean equals(Object other) {
+ if (other != null && other instanceof OpenBlocksFailed) {
+ OpenBlocksFailed o = (OpenBlocksFailed) other;
+ return Objects.equal(reason, o.reason);
--- End diff --
nit: `this.reason == o.reason`?
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