code: @Test public void testLogCleaning() throws Exception {
    Configuration c=TEST_UTIL.getConfiguration();
    Path oldLogDir=new Path(TEST_UTIL.getTestDir(),HConstants.HREGION_OLDLOGDIR_NAME);
    FileSystem fs=FileSystem.get(c);
    AtomicBoolean stop=new AtomicBoolean(false);
    OldLogsCleaner cleaner=new OldLogsCleaner(1000,stop,c,fs,oldLogDir);
    long now=System.currentTimeMillis();
    fs.delete(oldLogDir,true);
    fs.mkdirs(oldLogDir);
    fs.createNewFile(new Path(oldLogDir,"a"));
    fs.createNewFile(new Path(oldLogDir,"1.hlog.dat.a"));
    fs.createNewFile(new Path(oldLogDir,"1.hlog.dat." + now));
    for (int i=0; i < 30; i++) {
      fs.createNewFile(new Path(oldLogDir,i + ".hlog.dat." + (now - 6000000)));
    }
    fs.createNewFile(new Path(oldLogDir,"a.hlog.dat." + (now + 10000)));
    assertEquals(34,fs.listStatus(oldLogDir).length);
    cleaner.chore();
    assertEquals(14,fs.listStatus(oldLogDir).length);
    cleaner.chore();
    assertEquals(1,fs.listStatus(oldLogDir).length);
  }
  