com.bizosys.hsearch.kv.indexing.MapFileSizeReader.java Source code

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Here is the source code for com.bizosys.hsearch.kv.indexing.MapFileSizeReader.java

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/*
* Copyright 2013 Bizosys Technologies Limited
*
* Licensed to the Bizosys Technologies Limited (Bizosys) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The Bizosys 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 com.bizosys.hsearch.kv.indexing;

import java.net.URI;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.MapFile;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.ReflectionUtils;

/**
 * Reads a given indexed map file and prints key and value size.
 * @author shubhendu
 *
 */
public class MapFileSizeReader {

    public static void main(String[] args) {
        if (args.length < 1) {
            System.out.println("Usage: " + MapFileSizeReader.class + " <<hdfs-filepath>> <<key>>");
            System.exit(1);
        }

        String hdfsFilePath = args[0].trim();
        String askedKey = null;
        if (args.length == 2)
            askedKey = (args[1].trim());

        MapFile.Reader reader = null;
        try {
            Configuration conf = new Configuration();
            FileSystem fs = FileSystem.get(URI.create(hdfsFilePath), conf);
            reader = new MapFile.Reader(fs, hdfsFilePath, conf);

            if (null == askedKey) {
                Text key = (Text) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
                BytesWritable value = (BytesWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);

                while (reader.next(key, value)) {
                    if (null == value)
                        System.out.println(key.toString() + "\t0");
                    System.out.println(key.toString() + "\t" + value.getLength());
                }
            } else {
                Text key = (Text) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
                key.set(askedKey.getBytes());
                BytesWritable value = (BytesWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);

                reader.get(key, value);
                System.out.println(key.toString() + "\t" + value.getLength());
            }
        } catch (Exception e) {
            System.err.println("Error in reading from HDFSFilepath:" + hdfsFilePath);
            e.printStackTrace(System.out);
        } finally {
            IOUtils.closeStream(reader);
        }

    }

}