spark AccumulableInfo 源码
spark AccumulableInfo 代码
文件路径：/core/src/main/scala/org/apache/spark/scheduler/AccumulableInfo.scala
/*
* 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.scheduler
import org.apache.spark.annotation.DeveloperApi
/**
* :: DeveloperApi ::
* Information about an [[org.apache.spark.util.AccumulatorV2]] modified during a task or stage.
*
* @param id accumulator ID
* @param name accumulator name
* @param update partial value from a task, may be None if used on driver to describe a stage
* @param value total accumulated value so far, maybe None if used on executors to describe a task
* @param internal whether this accumulator was internal
* @param countFailedValues whether to count this accumulator's partial value if the task failed
* @param metadata internal metadata associated with this accumulator, if any
*
* @note Once this is JSON serialized the types of `update` and `value` will be lost and be
* cast to strings. This is because the user can define an accumulator of any type and it will
* be difficult to preserve the type in consumers of the event log. This does not apply to
* internal accumulators that represent task level metrics.
*/
@DeveloperApi
case class AccumulableInfo private[spark] (
id: Long,
name: Option[String],
update: Option[Any], // represents a partial update within a task
value: Option[Any],
private[spark] val internal: Boolean,
private[spark] val countFailedValues: Boolean,
// TODO: use this to identify internal task metrics instead of encoding it in the name
private[spark] val metadata: Option[String] = None)
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