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core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosTaskLaunchData.scala
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/* | ||
* 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. | ||
*/ | ||
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package org.apache.spark.scheduler.cluster.mesos | ||
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import java.nio.ByteBuffer | ||
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import org.apache.mesos.protobuf.ByteString | ||
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/** | ||
* Wrapper for serializing the data sent when launching Mesos tasks. | ||
*/ | ||
private[spark] case class MesosTaskLaunchData( | ||
serializedTask: ByteBuffer, | ||
attemptNumber: Int) { | ||
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def toByteString: ByteString = { | ||
val dataBuffer = ByteBuffer.allocate(4 + serializedTask.limit) | ||
dataBuffer.putInt(attemptNumber) | ||
dataBuffer.put(serializedTask) | ||
ByteString.copyFrom(dataBuffer) | ||
} | ||
} | ||
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private[spark] object MesosTaskLaunchData { | ||
def fromByteString(byteString: ByteString): MesosTaskLaunchData = { | ||
val byteBuffer = byteString.asReadOnlyByteBuffer() | ||
val attemptNumber = byteBuffer.getInt // updates the position by 4 bytes | ||
val serializedTask = byteBuffer.slice() // subsequence starting at the current position | ||
MesosTaskLaunchData(serializedTask, attemptNumber) | ||
} | ||
} |
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