ReadAllTest.java Source code

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Here is the source code for ReadAllTest.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.app;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.Thread;
import java.lang.System;
import java.net.URI;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
import java.util.StringTokenizer;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.security.AccessControlException;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;

public class ReadAllTest extends Configured {
    private static int readAt(FSDataInputStream fis, long at) throws IOException {
        fis.seek(at);
        return fis.read();
    }

    public static void main(String[] args) throws Exception {
        if (args.length < 2) {
            System.out.println("ReadAllTest: must supply the HDFS uri and file to read");
            System.exit(1);
        }
        String hdfsUri = args[0];
        String fileName = args[1];
        final Configuration conf = new Configuration();
        FileSystem fs = FileSystem.get(new URI(hdfsUri), conf);

        byte ORIGINAL[] = new byte[10];
        for (int i = 0; i < ORIGINAL.length; i++) {
            ORIGINAL[i] = (byte) i;
        }
        FSDataOutputStream out = fs.create(new Path(fileName), (short) 1);
        try {
            out.write(ORIGINAL);
        } finally {
            out.close();
        }
        byte input[] = new byte[ORIGINAL.length];
        FSDataInputStream in = fs.open(new Path(fileName));
        try {
            in.readFully(input);
        } finally {
            in.close();
        }
        in = fs.open(new Path(fileName));
        try {
            in.readFully(0, input);
        } finally {
            in.close();
        }
    }
}