org.apache.hadoop.streaming.TestUlimit.java Source code

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Here is the source code for org.apache.hadoop.streaming.TestUlimit.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.streaming;

import java.io.*;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.dfs.MiniDFSCluster;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapred.MiniMRCluster;
import org.apache.hadoop.mapred.TestMiniMRWithDFS;
import org.apache.hadoop.util.*;

import junit.framework.TestCase;

/**
 * This tests the setting of memory limit for streaming processes.
 * This will launch a streaming app which will allocate 10MB memory.
 * First, program is launched with sufficient memory. And test expects
 * it to succeed. Then program is launched with insufficient memory and 
 * is expected to be a failure.  
 */
public class TestUlimit extends TestCase {
    String input = "the dummy input";
    Path inputPath = new Path("/testing/in");
    Path outputPath = new Path("/testing/out");
    String map = null;
    MiniDFSCluster dfs = null;
    MiniMRCluster mr = null;
    FileSystem fs = null;
    private static String SET_MEMORY_LIMIT = "786432"; // 768MB

    String[] genArgs(String memLimit) {
        return new String[] { "-input", inputPath.toString(), "-output", outputPath.toString(), "-mapper", map,
                "-reducer", "org.apache.hadoop.mapred.lib.IdentityReducer", "-numReduceTasks", "0", "-jobconf",
                "mapred.map.tasks=1", "-jobconf", "mapred.child.ulimit=" + memLimit, "-jobconf",
                "mapred.job.tracker=" + "localhost:" + mr.getJobTrackerPort(), "-jobconf",
                "fs.default.name=" + "hdfs://localhost:" + dfs.getNameNodePort(), "-jobconf",
                "stream.tmpdir=" + System.getProperty("test.build.data", "/tmp") };
    }

    /**
     * This tests the setting of memory limit for streaming processes.
     * This will launch a streaming app which will allocate 10MB memory.
     * First, program is launched with sufficient memory. And test expects
     * it to succeed. Then program is launched with insufficient memory and 
     * is expected to be a failure.  
     */
    public void testCommandLine() {
        if (StreamUtil.isCygwin()) {
            return;
        }
        try {
            final int numSlaves = 2;
            Configuration conf = new Configuration();
            dfs = new MiniDFSCluster(conf, numSlaves, true, null);
            fs = dfs.getFileSystem();

            mr = new MiniMRCluster(numSlaves, fs.getUri().toString(), 1);
            writeInputFile(fs, inputPath);
            map = StreamUtil.makeJavaCommand(UlimitApp.class, new String[] {});
            runProgram(SET_MEMORY_LIMIT);
            FileUtil.fullyDelete(fs, outputPath);
            assertFalse("output not cleaned up", fs.exists(outputPath));
            mr.waitUntilIdle();
        } catch (IOException e) {
            fail(e.toString());
        } finally {
            mr.shutdown();
            dfs.shutdown();
        }
    }

    private void writeInputFile(FileSystem fs, Path dir) throws IOException {
        DataOutputStream out = fs.create(new Path(dir, "part0"));
        out.writeBytes(input);
        out.close();
    }

    /**
     * Runs the streaming program. and asserts the result of the program.
     * @param memLimit memory limit to set for mapred child.
     * @param result Expected result
     * @throws IOException
     */
    private void runProgram(String memLimit) throws IOException {
        boolean mayExit = false;
        StreamJob job = new StreamJob(genArgs(memLimit), mayExit);
        job.go();
        String output = TestMiniMRWithDFS.readOutput(outputPath, mr.createJobConf());
        assertEquals("output is wrong", SET_MEMORY_LIMIT, output.trim());
    }

    public static void main(String[] args) throws Exception {
        new TestUlimit().testCommandLine();
    }

}