spark ExecutorDiskUtils 源码
spark ExecutorDiskUtils 代码
文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/ExecutorDiskUtils.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.network.shuffle;
import java.io.File;
import org.apache.spark.network.util.JavaUtils;
public class ExecutorDiskUtils {
/**
* Hashes a filename into the corresponding local directory, in a manner consistent with
* Spark's DiskBlockManager.getFile().
*/
public static String getFilePath(String[] localDirs, int subDirsPerLocalDir, String filename) {
int hash = JavaUtils.nonNegativeHash(filename);
String localDir = localDirs[hash % localDirs.length];
int subDirId = (hash / localDirs.length) % subDirsPerLocalDir;
final String notNormalizedPath =
localDir + File.separator + String.format("%02x", subDirId) + File.separator + filename;
// Interning the normalized path as according to measurements, in some scenarios such
// duplicate strings may waste a lot of memory (~ 10% of the heap).
// Unfortunately, we cannot just call the normalization code that java.io.File
// uses, since it is in the package-private class java.io.FileSystem.
// So we are creating a File just to get the normalized path back to intern it.
// We return this interned normalized path.
return new File(notNormalizedPath).getPath().intern();
}
}
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