Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12612#discussion_r61217219
--- Diff: core/src/main/scala/org/apache/spark/NewAccumulator.scala ---
@@ -0,0 +1,333 @@
+/*
+ * 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
+
+import java.{lang => jl}
+import java.io.{ObjectInputStream, ObjectOutputStream}
+import java.util.concurrent.atomic.AtomicLong
+import javax.annotation.concurrent.GuardedBy
+
+import org.apache.spark.scheduler.AccumulableInfo
+import org.apache.spark.util.Utils
+
+
+private[spark] case class AccumulatorMetadata(
+ id: Long,
+ name: Option[String],
+ countFailedValues: Boolean) extends Serializable
+
+
+abstract class NewAccumulator[IN, OUT] extends Serializable {
+ private[spark] var metadata: AccumulatorMetadata = _
+ private[this] var atDriverSide = true
+
+ private[spark] def register(
+ sc: SparkContext,
+ name: Option[String] = None,
+ countFailedValues: Boolean = false): Unit = {
+ if (this.metadata != null) {
+ throw new IllegalStateException("Cannot register an Accumulator
twice.")
+ }
+ this.metadata = AccumulatorMetadata(AccumulatorContext.newId(), name,
countFailedValues)
+ AccumulatorContext.register(this)
+ sc.cleaner.foreach(_.registerAccumulatorForCleanup(this))
+ }
+
+ final def isRegistered: Boolean =
+ metadata != null &&
AccumulatorContext.originals.containsKey(metadata.id)
+
+ private def assertMetadataNotNull(): Unit = {
+ if (metadata == null) {
+ throw new IllegalAccessError("The metadata of this accumulator has
not been assigned yet.")
+ }
+ }
+
+ def id: Long = {
+ assertMetadataNotNull()
+ metadata.id
+ }
+
+ def name: Option[String] = {
+ assertMetadataNotNull()
+ metadata.name
+ }
+
+ def countFailedValues: Boolean = {
+ assertMetadataNotNull()
+ metadata.countFailedValues
+ }
+
+ private[spark] def toInfo(update: Option[Any], value: Option[Any]):
AccumulableInfo = {
+ val isInternal =
name.exists(_.startsWith(InternalAccumulator.METRICS_PREFIX))
+ new AccumulableInfo(id, name, update, value, isInternal,
countFailedValues)
+ }
+
+ final private[spark] def isAtDriverSide: Boolean = atDriverSide
+
+ def copyAndReset(): NewAccumulator[IN, OUT]
+
+ def isZero(): Boolean
+
+ def add(v: IN): Unit
+
+ def +=(v: IN): Unit = add(v)
+
+ def merge(other: NewAccumulator[IN, OUT]): Unit
+
+ final def value: OUT = {
+ if (atDriverSide) {
+ localValue
+ } else {
+ throw new UnsupportedOperationException("Can't read accumulator
value in task")
+ }
+ }
+
+ def localValue: OUT
+
+ // Called by Java when serializing an object
+ private def writeObject(out: ObjectOutputStream): Unit =
Utils.tryOrIOException {
+ if (atDriverSide) {
+ if (!isRegistered) {
+ throw new UnsupportedOperationException(
+ "Accumulator must be registered before send to executor")
+ }
+ // TODO: this is wrong.
--- End diff --
as discussed offline, writeReplace
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