private void initTrackerFromOldLogs() {
    if (logs.isEmpty() || !isRunning()) {
      return;
    }
    ProcedureWALFile log = logs.getLast();
    if (!log.getTracker().isPartial()) {
      storeTracker.resetTo(log.getTracker());
    } else {
      storeTracker.reset();
      storeTracker.setPartialFlag(true);
    }
  }
If last log's tracker is not null, use it as {@link #storeTracker}. Otherwise, set storeTracker
as partial, and let {@link ProcedureWALFormatReader} rebuild it using entries in the log.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/wal/WALProcedureStore.java