org.apache.hadoop.mapred.Utils.java Source code

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Here is the source code for org.apache.hadoop.mapred.Utils.java

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/**
 * 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.mapred;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathFilter;

/**
 * A utility class. It provides
 *   A path filter utility to filter out output/part files in the output dir
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class Utils {
    public static class OutputFileUtils {
        /**
         * This class filters output(part) files from the given directory
         * It does not accept files with filenames _logs and _SUCCESS.
         * This can be used to list paths of output directory as follows:
         *   Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir,
         *                                         new OutputFilesFilter()));
         */
        public static class OutputFilesFilter extends OutputLogFilter {
            public boolean accept(Path path) {
                return super.accept(path) && !FileOutputCommitter.SUCCEEDED_FILE_NAME.equals(path.getName());
            }
        }

        /**
         * This class filters log files from directory given
         * It doesnt accept paths having _logs.
         * This can be used to list paths of output directory as follows:
         *   Path[] fileList = FileUtil.stat2Paths(fs.listStatus(outDir,
         *                                   new OutputLogFilter()));
         */
        public static class OutputLogFilter implements PathFilter {
            public boolean accept(Path path) {
                return !"_logs".equals(path.getName());
            }
        }
    }
}