public static void createIfNeededAndNotExists(Configuration conf, MasterServices masterServices)
    throws IOException {
    boolean walEventTrackerEnabled =
      conf.getBoolean(WAL_EVENT_TRACKER_ENABLED_KEY, WAL_EVENT_TRACKER_ENABLED_DEFAULT);
    if (!walEventTrackerEnabled) {
      LOG.info("wal event tracker requests logging to table " + WAL_EVENT_TRACKER_TABLE_NAME_STR
        + " is disabled. Quitting.");
      return;
    }
    if (
      !masterServices.getTableDescriptors()
        .exists(WALEventTrackerTableAccessor.WAL_EVENT_TRACKER_TABLE_NAME)
    ) {
      LOG.info(WAL_EVENT_TRACKER_TABLE_NAME_STR + " table not found. Creating.");
      masterServices.createTable(TABLE_DESCRIPTOR_BUILDER.build(), null, 0L, NO_NONCE);
    }
  }
The walEventTracker info family in array of bytes
hbase-server/src/main/java/org/apache/hadoop/hbase/master/waleventtracker/WALEventTrackerTableCreator.java