spark TimeTrackingOutputStream 源码
spark TimeTrackingOutputStream 代码
文件路径：/core/src/main/java/org/apache/spark/storage/TimeTrackingOutputStream.java
/*
* 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.storage;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.spark.annotation.Private;
import org.apache.spark.shuffle.ShuffleWriteMetricsReporter;
/**
* Intercepts write calls and tracks total time spent writing in order to update shuffle write
* metrics. Not thread safe.
*/
@Private
public final class TimeTrackingOutputStream extends OutputStream {
private final ShuffleWriteMetricsReporter writeMetrics;
private final OutputStream outputStream;
public TimeTrackingOutputStream(
ShuffleWriteMetricsReporter writeMetrics, OutputStream outputStream) {
this.writeMetrics = writeMetrics;
this.outputStream = outputStream;
}
@Override
public void write(int b) throws IOException {
final long startTime = System.nanoTime();
outputStream.write(b);
writeMetrics.incWriteTime(System.nanoTime() - startTime);
}
@Override
public void write(byte[] b) throws IOException {
final long startTime = System.nanoTime();
outputStream.write(b);
writeMetrics.incWriteTime(System.nanoTime() - startTime);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
final long startTime = System.nanoTime();
outputStream.write(b, off, len);
writeMetrics.incWriteTime(System.nanoTime() - startTime);
}
@Override
public void flush() throws IOException {
final long startTime = System.nanoTime();
outputStream.flush();
writeMetrics.incWriteTime(System.nanoTime() - startTime);
}
@Override
public void close() throws IOException {
final long startTime = System.nanoTime();
outputStream.close();
writeMetrics.incWriteTime(System.nanoTime() - startTime);
}
}
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