svn commit: r938387 - /hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java

[vi...@apache.org]

Author: vinodkv
Date: Tue Apr 27 10:00:10 2010
New Revision: 938387

URL: http://svn.apache.org/viewvc?rev=938387&view=rev
Log:
MAPREDUCE-1397. Adding the previously missed new test case class.

Added:
    hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java

Added: hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java
URL: http://svn.apache.org/viewvc/hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java?rev=938387&view=auto
==============================================================================
--- hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java (added)
+++ hadoop/mapreduce/trunk/src/test/mapred/org/apache/hadoop/mapred/TestJvmManager.java Tue Apr 27 10:00:10 2010
@@ -0,0 +1,183 @@
+/**
+ * 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.mapred;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Vector;
+
+import org.apache.hadoop.fs.FileUtil;
+import org.apache.hadoop.mapred.JvmManager.JvmManagerForType;
+import org.apache.hadoop.mapred.JvmManager.JvmManagerForType.JvmRunner;
+import org.apache.hadoop.mapred.TaskTracker.TaskInProgress;
+import org.apache.hadoop.mapreduce.TaskType;
+import org.apache.hadoop.mapreduce.server.tasktracker.TTConfig;
+import org.junit.After;
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestJvmManager {
+  private static File TEST_DIR = new File(System.getProperty("test.build.data",
+      "/tmp"), TestJvmManager.class.getSimpleName());
+  private static int MAP_SLOTS = 1;
+  private static int REDUCE_SLOTS = 1;
+  private TaskTracker tt;
+  private JvmManager jvmManager;
+  private JobConf ttConf;
+
+  @Before
+  public void setUp() {
+    TEST_DIR.mkdirs();
+  }
+
+  @After
+  public void tearDown() throws IOException {
+    FileUtil.fullyDelete(TEST_DIR);
+  }
+
+  public TestJvmManager() throws Exception {
+    tt = new TaskTracker();
+    ttConf = new JobConf();
+    ttConf.setLong(TTConfig.TT_SLEEP_TIME_BEFORE_SIG_KILL, 2000);
+    tt.setConf(ttConf);
+    tt.setMaxMapSlots(MAP_SLOTS);
+    tt.setMaxReduceSlots(REDUCE_SLOTS);
+    tt.setTaskController(new DefaultTaskController());
+    jvmManager = new JvmManager(tt);
+    tt.setJvmManagerInstance(jvmManager);
+  }
+
+  // write a shell script to execute the command.
+  private File writeScript(String fileName, String cmd, File pidFile) throws IOException {
+    File script = new File(TEST_DIR, fileName);
+    FileOutputStream out = new FileOutputStream(script);
+    // write pid into a file
+    out.write(("echo $$ >" + pidFile.toString() + ";").getBytes());
+    // ignore SIGTERM
+    out.write(("trap '' 15\n").getBytes());
+    // write the actual command it self.
+    out.write(cmd.getBytes());
+    out.close();
+    script.setExecutable(true);
+    return script;
+  }
+  
+  /**
+   * Tests the jvm kill from JvmRunner and JvmManager simultaneously.
+   * 
+   * Starts a process, which sleeps for 60 seconds, in a thread.
+   * Calls JvmRunner.kill() in a thread.
+   * Also calls JvmManager.taskKilled().
+   * Makes sure that the jvm is killed and JvmManager could launch another task
+   * properly.
+   * @throws Exception
+   */
+  @Test
+  public void testJvmKill() throws Exception {
+    JvmManagerForType mapJvmManager = jvmManager
+        .getJvmManagerForType(TaskType.MAP);
+    // launch a jvm
+    JobConf taskConf = new JobConf(ttConf);
+    TaskAttemptID attemptID = new TaskAttemptID("test", 0, TaskType.MAP, 0, 0);
+    Task task = new MapTask(null, attemptID, 0, null, MAP_SLOTS);
+    task.setConf(taskConf);
+    TaskInProgress tip = tt.new TaskInProgress(task, taskConf);
+    File pidFile = new File(TEST_DIR, "pid");
+    final TaskRunner taskRunner = task.createRunner(tt, tip);
+    // launch a jvm which sleeps for 60 seconds
+    final Vector<String> vargs = new Vector<String>(2);
+    vargs.add(writeScript("SLEEP", "sleep 60\n", pidFile).getAbsolutePath());
+    final File workDir = new File(TEST_DIR, "work");
+    workDir.mkdir();
+    final File stdout = new File(TEST_DIR, "stdout");
+    final File stderr = new File(TEST_DIR, "stderr");
+
+    // launch the process and wait in a thread, till it finishes
+    Thread launcher = new Thread() {
+      public void run() {
+        try {
+          taskRunner.launchJvmAndWait(null, vargs, stdout, stderr, 100,
+              workDir, null);
+        } catch (InterruptedException e) {
+          e.printStackTrace();
+          return;
+        }
+      }
+    };
+    launcher.start();
+    // wait till the jvm is launched
+    // this loop waits for at most 1 second
+    for (int i = 0; i < 10; i++) {
+      if (pidFile.exists()) {
+        break;
+      }
+      UtilsForTests.waitFor(100);
+    }
+    // assert that the process is launched
+    assertTrue("pidFile is not present", pidFile.exists());
+    
+    // imitate Child code.
+    // set pid in jvmManager
+    BufferedReader in = new  BufferedReader(new FileReader(pidFile));
+    String pid = in.readLine();
+    in.close();
+    JVMId jvmid = mapJvmManager.runningTaskToJvm.get(taskRunner);
+    jvmManager.setPidToJvm(jvmid, pid);
+
+    // kill JvmRunner
+    final JvmRunner jvmRunner = mapJvmManager.jvmIdToRunner.get(jvmid);
+    Thread killer = new Thread() {
+      public void run() {
+        jvmRunner.kill();
+      }
+    };
+    killer.start();
+    
+    //wait for a while so that killer thread is started.
+    Thread.sleep(100);
+
+    // kill the jvm externally
+    taskRunner.kill();
+
+    assertTrue(jvmRunner.killed);
+
+    // launch another jvm and see it finishes properly
+    attemptID = new TaskAttemptID("test", 0, TaskType.MAP, 0, 1);
+    task = new MapTask(null, attemptID, 0, null, MAP_SLOTS);
+    task.setConf(taskConf);
+    tip = tt.new TaskInProgress(task, taskConf);
+    TaskRunner taskRunner2 = task.createRunner(tt, tip);
+    // build dummy vargs to call ls
+    Vector<String> vargs2 = new Vector<String>(1);
+    vargs2.add(writeScript("LS", "ls", pidFile).getAbsolutePath());
+    File workDir2 = new File(TEST_DIR, "work2");
+    workDir.mkdir();
+    File stdout2 = new File(TEST_DIR, "stdout2");
+    File stderr2 = new File(TEST_DIR, "stderr2");
+    taskRunner2.launchJvmAndWait(null, vargs2, stdout2, stderr2, 100, workDir2,
+        null);
+    // join all the threads
+    killer.join();
+    jvmRunner.join();
+    launcher.join();
+  }
+}