code: private boolean shouldIgnore(Path filePath, long modificationTime) {
  		assert (Thread.holdsLock(checkpointLock));
  		boolean shouldIgnore = modificationTime <= globalModificationTime;
  		if (shouldIgnore && LOG.isDebugEnabled()) {
  			LOG.debug("Ignoring " + filePath + ", with mod time= " + modificationTime +
  				" and global mod time= " + globalModificationTime);
  		}
  		return shouldIgnore;
  	}
docs: Returns {@code true} if the file is NOT to be processed further.
  This happens if the modification time of the file is smaller than
  the {@link #globalModificationTime}.
  @param filePath the path of the file to check.
  @param modificationTime the modification time of the file.