/**
   * Tests job user-log directory deletion.
   *
   * <p>Adds two jobs for log deletion. One with one hour retain hours, other with two retain hours.
   * After an hour, TaskLogCleanupThread.processCompletedJobs() call, makes sure job with 1hr retain
   * hours is removed and other is retained. After one more hour, job with 2hr retain hours is also
   * removed.
   *
   * @throws IOException
   */
  @Test
  public void testJobLogCleanup() throws IOException {
    File jobUserlog1 = localizeJob(jobid1);
    File jobUserlog2 = localizeJob(jobid2);

    // add job user log directory for deletion, with 2 hours for deletion
    jobFinished(jobid1, 2);

    // add the job for deletion with one hour as retain hours
    jobFinished(jobid2, 1);

    // remove old logs and see jobid1 is not removed and jobid2 is removed
    myClock.advance(ONE_HOUR);
    userLogCleaner.processCompletedJobs();
    assertTrue(jobUserlog1 + " got deleted", jobUserlog1.exists());
    assertFalse(jobUserlog2 + " still exists.", jobUserlog2.exists());

    myClock.advance(ONE_HOUR);
    // remove old logs and see jobid1 is removed now
    userLogCleaner.processCompletedJobs();
    assertFalse(jobUserlog1 + " still exists.", jobUserlog1.exists());
  }
  /**
   * Tests user-log directory cleanup on a TT restart.
   *
   * <p>Adds job1 deletion before the restart with 2 hour retain hours. Adds job2 for which there
   * are no tasks/killJobAction after the restart. Adds job3 for which there is localizeJob followed
   * by killJobAction after the restart with 3 hours retain hours. Adds job4 for which there are
   * some tasks after the restart.
   *
   * @throws IOException
   * @throws InterruptedException
   */
  @Test
  public void testUserLogCleanupAfterRestart() throws IOException, InterruptedException {
    File jobUserlog1 = localizeJob(jobid1);
    File jobUserlog2 = localizeJob(jobid2);
    File jobUserlog3 = localizeJob(jobid3);
    File jobUserlog4 = localizeJob(jobid4);
    // create a some files/dirs in userlog
    foo.mkdirs();
    bar.createNewFile();

    // add the jobid1 for deletion with retain hours = 2
    jobFinished(jobid1, 2);

    // time is now 1.
    myClock.advance(ONE_HOUR);

    // Mimic the TaskTracker restart
    // Restart the tt with 3 hours as user log retain hours.
    // This restart clears the user log directory
    // job directories will be added with 3 hours as retain hours.
    // i.e. They will be deleted at time 3 as clock will reset after the restart
    ttRestarted();

    assertFalse(foo.exists());
    assertFalse(bar.exists());
    assertTrue(jobUserlog1.exists());
    assertTrue(jobUserlog2.exists());
    assertTrue(jobUserlog3.exists());
    assertTrue(jobUserlog4.exists());

    myClock.advance(ONE_HOUR);
    // time is now 1.
    userLogCleaner.processCompletedJobs();
    assertTrue(jobUserlog1.exists());
    assertTrue(jobUserlog2.exists());
    assertTrue(jobUserlog3.exists());
    assertTrue(jobUserlog4.exists());

    // mimic localizeJob followed KillJobAction for jobid3
    // add the job for deletion with retainhours = 3.
    // jobid3 should be deleted at time 4.
    jobUserlog3 = localizeJob(jobid3);
    jobFinished(jobid3, 3);

    // mimic localizeJob for jobid4
    jobUserlog4 = localizeJob(jobid4);

    // do cleanup
    myClock.advance(2 * ONE_HOUR);
    // time is now 3.
    userLogCleaner.processCompletedJobs();

    // jobid1 and jobid2 will be deleted
    assertFalse(jobUserlog1.exists());
    assertFalse(jobUserlog2.exists());
    assertTrue(jobUserlog3.exists());
    assertTrue(jobUserlog4.exists());

    myClock.advance(ONE_HOUR);
    // time is now 4.
    // do cleanup again
    userLogCleaner.processCompletedJobs();

    // jobid3 will be deleted
    assertFalse(jobUserlog1.exists());
    assertFalse(jobUserlog2.exists());
    assertFalse(jobUserlog3.exists());
    assertTrue(jobUserlog4.exists());
  }