Java tutorial
/* * 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.ignite.internal.processors.hadoop.fs; import org.apache.hadoop.conf.*; import org.apache.hadoop.fs.*; import org.apache.hadoop.hdfs.protocol.*; import org.apache.ignite.hadoop.fs.v1.*; /** * Utilities for configuring file systems to support the separate working directory per each thread. */ public class HadoopFileSystemsUtils { /** Name of the property for setting working directory on create new local FS instance. */ public static final String LOC_FS_WORK_DIR_PROP = "fs." + FsConstants.LOCAL_FS_URI.getScheme() + ".workDir"; /** * Set user name and default working directory for current thread if it's supported by file system. * * @param fs File system. * @param userName User name. */ public static void setUser(FileSystem fs, String userName) { if (fs instanceof IgniteHadoopFileSystem) ((IgniteHadoopFileSystem) fs).setUser(userName); else if (fs instanceof HadoopDistributedFileSystem) ((HadoopDistributedFileSystem) fs).setUser(userName); } /** * Setup wrappers of filesystems to support the separate working directory. * * @param cfg Config for setup. */ public static void setupFileSystems(Configuration cfg) { cfg.set("fs." + FsConstants.LOCAL_FS_URI.getScheme() + ".impl", HadoopLocalFileSystemV1.class.getName()); cfg.set("fs.AbstractFileSystem." + FsConstants.LOCAL_FS_URI.getScheme() + ".impl", HadoopLocalFileSystemV2.class.getName()); cfg.set("fs." + HdfsConstants.HDFS_URI_SCHEME + ".impl", HadoopDistributedFileSystem.class.getName()); } }