hadoop IOUtilsClient 源码
haddop IOUtilsClient 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/IOUtilsClient.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.hadoop.hdfs.util;
import org.apache.hadoop.hdfs.BlockReader;
import org.apache.hadoop.hdfs.ReadStatistics;
import org.slf4j.Logger;
import java.io.IOException;
public class IOUtilsClient {
/**
* Close the Closeable objects and <b>ignore</b> any {@link IOException} or
* null pointers. Must only be used for cleanup in exception handlers.
*
* @param log the log to record problems to at debug level. Can be null.
* @param closeables the objects to close
*/
public static void cleanupWithLogger(Logger log,
java.io.Closeable... closeables) {
for (java.io.Closeable c : closeables) {
if (c != null) {
try {
c.close();
} catch(Throwable e) {
if (log != null && log.isDebugEnabled()) {
log.debug("Exception in closing " + c, e);
}
}
}
}
}
public static void updateReadStatistics(ReadStatistics readStatistics,
int nRead, BlockReader blockReader) {
updateReadStatistics(readStatistics, nRead, blockReader.isShortCircuit(),
blockReader.getNetworkDistance());
}
public static void updateReadStatistics(ReadStatistics readStatistics,
int nRead, boolean isShortCircuit, int networkDistance) {
if (nRead <= 0) {
return;
}
if (isShortCircuit) {
readStatistics.addShortCircuitBytes(nRead);
} else if (networkDistance == 0) {
readStatistics.addLocalBytes(nRead);
} else {
readStatistics.addRemoteBytes(nRead);
}
}
}
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