com.cloudera.HdfsClientHeapBench.java Source code

Introduction

Here is the source code for com.cloudera.HdfsClientHeapBench.java

Source

/**
 * 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 com.cloudera;

import java.io.IOException;
import java.lang.Thread;
import java.lang.System;
import java.net.URI;

import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Path;

/**
 * This tests symlink behaviors in Hadoop.
 */
public class HdfsClientHeapBench {
    private static void createFile(FileSystem dfs, Path path, int len) throws Exception {
        FSDataOutputStream out = dfs.create(path);
        byte buf[] = new byte[len];
        try {
            out.write(buf);
        } finally {
            out.close();
        }
    }

    public static void main(String[] args) throws Exception {
        System.out.println("running HdfsClientHeapBench: benchmarks " + "input stream size in Hadoop...\n");
        final int NUM_OPENS = 50000;
        if (args.length < 1) {
            System.err.println("You must specify a single argument: the URI " + "of a directory to test.\n"
                    + "Examples: file:///tmp, hdfs:///\n");
            System.exit(1);
        }
        final String uri = args[0];
        Configuration conf = new Configuration();
        conf.setBoolean("dfs.client.read.shortcircuit", false);
        FSDataInputStream[] streams = new FSDataInputStream[NUM_OPENS];
        try {
            FileSystem dfs = FileSystem.get(new URI(uri), conf);
            final Path TEST_PATH = new Path("/testFile");
            createFile(dfs, TEST_PATH, 131072);
            for (int i = 0; i < NUM_OPENS; i++) {
                streams[i] = dfs.open(TEST_PATH);
                System.out.println("opening file " + i + "...");
                if (0 != streams[i].read()) {
                    throw new IOException("failed to read a byte from stream " + i + ": unexpected EOF.");
                }
                streams[i].unbuffer();
            }
            // Sleep for a long time so we can run jmat to get a heap dump
            Thread.sleep(9000000L);
        } finally {
            for (FSDataInputStream stream : streams) {
                try {
                    if (stream != null) {
                        stream.close();
                    }
                } catch (IOException e) {
                    System.out.println("error closing stream: " + e.getMessage());
                }
            }
        }
    }
}