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[SPARK-21269][Core][WIP] Fix FetchFailedException when enable maxReqSizeShuffleToMem and KryoSerializer #18490

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[SPARK-21269][Core][WIP] Fix FetchFailedException when enable maxReqSizeShuffleToMem and KryoSerializer #18490

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13 changes: 12 additions & 1 deletion core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@ import java.io.{Externalizable, ObjectInput, ObjectOutput}
import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer

import com.esotericsoftware.kryo.{Kryo, KryoSerializable}
import com.esotericsoftware.kryo.io.{Input, Output}
import org.roaringbitmap.RoaringBitmap

import org.apache.spark.SparkEnv
Expand Down Expand Up @@ -142,7 +144,7 @@ private[spark] class HighlyCompressedMapStatus private (
private[this] var emptyBlocks: RoaringBitmap,
private[this] var avgSize: Long,
private var hugeBlockSizes: Map[Int, Byte])
extends MapStatus with Externalizable {
extends MapStatus with Externalizable with KryoSerializable {

// loc could be null when the default constructor is called during deserialization
require(loc == null || avgSize > 0 || hugeBlockSizes.size > 0 || numNonEmptyBlocks == 0,
Expand Down Expand Up @@ -189,6 +191,15 @@ private[spark] class HighlyCompressedMapStatus private (
}
hugeBlockSizes = hugeBlockSizesArray.toMap
}

override def write(kryo: Kryo, output: Output): Unit = {
kryo.writeClassAndObject(output, hugeBlockSizes)
}

override def read(kryo: Kryo, input: Input): Unit = {
hugeBlockSizes = kryo.readClassAndObject(input).asInstanceOf[Map[Int, Byte]]
}

}

private[spark] object HighlyCompressedMapStatus {
Expand Down