loads and optionally processes the journal checkpoint file . concode_field_sep JournalReader mReader concode_elem_sep long mLatestSequenceNumber concode_elem_sep Master mMaster concode_elem_sep Journal mJournal concode_elem_sep Logger LOG concode_field_sep long getLatestSequenceNumber concode_elem_sep boolean isValid concode_elem_sep boolean checkpointExists concode_elem_sep int processNextJournalLogFiles