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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.
*/
package spark.scheduler
import spark.storage.BlockManagerId
import java.io.{ObjectOutput, ObjectInput, Externalizable}
/**
* Result returned by a ShuffleMapTask to a scheduler. Includes the block manager address that the
* task ran on as well as the sizes of outputs for each reducer, for passing on to the reduce tasks.
* The map output sizes are compressed using MapOutputTracker.compressSize.
*/
private[spark] class MapStatus(var location: BlockManagerId, var compressedSizes: Array[Byte])
extends Externalizable {
def this() = this(null, null) // For deserialization only
def writeExternal(out: ObjectOutput) {
location.writeExternal(out)
out.writeInt(compressedSizes.length)
out.write(compressedSizes)
}
def readExternal(in: ObjectInput) {
location = BlockManagerId(in)
compressedSizes = new Array[Byte](in.readInt())
in.readFully(compressedSizes)
}
}
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