spark ShuffleWriteMetrics 源码
spark ShuffleWriteMetrics 代码
文件路径：/core/src/main/scala/org/apache/spark/executor/ShuffleWriteMetrics.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.executor
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.shuffle.ShuffleWriteMetricsReporter
import org.apache.spark.util.LongAccumulator
/**
* :: DeveloperApi ::
* A collection of accumulators that represent metrics about writing shuffle data.
* Operations are not thread-safe.
*/
@DeveloperApi
class ShuffleWriteMetrics private[spark] () extends ShuffleWriteMetricsReporter with Serializable {
private[executor] val _bytesWritten = new LongAccumulator
private[executor] val _recordsWritten = new LongAccumulator
private[executor] val _writeTime = new LongAccumulator
/**
* Number of bytes written for the shuffle by this task.
*/
def bytesWritten: Long = _bytesWritten.sum
/**
* Total number of records written to the shuffle by this task.
*/
def recordsWritten: Long = _recordsWritten.sum
/**
* Time the task spent blocking on writes to disk or buffer cache, in nanoseconds.
*/
def writeTime: Long = _writeTime.sum
private[spark] override def incBytesWritten(v: Long): Unit = _bytesWritten.add(v)
private[spark] override def incRecordsWritten(v: Long): Unit = _recordsWritten.add(v)
private[spark] override def incWriteTime(v: Long): Unit = _writeTime.add(v)
private[spark] override def decBytesWritten(v: Long): Unit = {
_bytesWritten.setValue(bytesWritten - v)
}
private[spark] override def decRecordsWritten(v: Long): Unit = {
_recordsWritten.setValue(recordsWritten - v)
}
}
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