spark ShuffleServiceHeartbeat 源码

2022-10-20
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spark ShuffleServiceHeartbeat 代码

文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/protocol/mesos/ShuffleServiceHeartbeat.java

/*
 * 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.mesos;

import io.netty.buffer.ByteBuf;
import org.apache.spark.network.protocol.Encoders;
import org.apache.spark.network.shuffle.protocol.BlockTransferMessage;

// Needed by ScalaDoc. See SPARK-7726
import static org.apache.spark.network.shuffle.protocol.BlockTransferMessage.Type;

/**
 * A heartbeat sent from the driver to the MesosExternalShuffleService.
 */
public class ShuffleServiceHeartbeat extends BlockTransferMessage {
  private final String appId;

  public ShuffleServiceHeartbeat(String appId) {
    this.appId = appId;
  }

  public String getAppId() { return appId; }

  @Override
  protected Type type() { return Type.HEARTBEAT; }

  @Override
  public int encodedLength() { return Encoders.Strings.encodedLength(appId); }

  @Override
  public void encode(ByteBuf buf) {
    Encoders.Strings.encode(buf, appId);
  }

  public static ShuffleServiceHeartbeat decode(ByteBuf buf) {
    return new ShuffleServiceHeartbeat(Encoders.Strings.decode(buf));
  }
}

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