com.cloudera.kitten.appmaster.util.HDFSFileFinder.java Source code

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Here is the source code for com.cloudera.kitten.appmaster.util.HDFSFileFinder.java

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/**
 * Copyright (c) 2012, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, Inc. 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
 *
 * This software 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 com.cloudera.kitten.appmaster.util;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.BlockLocation;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

import com.google.common.collect.Maps;

public class HDFSFileFinder extends Configured implements Tool {

    private static Log LOG = LogFactory.getLog(HDFSFileFinder.class);

    public Map<String, Long> getNumBytesOfGlobHeldByDatanodes(Path p) throws IOException {
        return getNumBytesOfGlobHeldByDatanodes(p, getConf());
    }

    public static Map<String, Long> getNumBytesOfGlobHeldByDatanodes(Path p, Configuration conf)
            throws IOException {
        FileSystem fs = p.getFileSystem(conf);

        HashMap<String, Long> bytesHeld = Maps.newHashMap();
        for (FileStatus f : fs.globStatus(p)) {
            BlockLocation[] bls = fs.getFileBlockLocations(p, 0, f.getLen());
            if (bls.length > 0) {
                for (BlockLocation bl : bls) {
                    long l = bl.getLength();
                    for (String name : bl.getNames()) {
                        if (bytesHeld.containsKey(name))
                            bytesHeld.put(name, bytesHeld.get(name) + l);
                        else
                            bytesHeld.put(name, l);
                    }
                }
            }
        }

        return bytesHeld;
    }

    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        for (String a : args) {
            Path p = new Path(a);
            Map<String, Long> bytesHeld = getNumBytesOfGlobHeldByDatanodes(p, conf);
            for (String node : bytesHeld.keySet())
                LOG.info(node + " : " + bytesHeld.get(node) + "b");
        }
        return 0;
    }

    public static void main(String[] args) throws Exception {
        ToolRunner.run(new Configuration(), new HDFSFileFinder(), args);
    }
}