@Override
  public void start(int numThreads) throws IOException {
    if (!setRunning(true)) {
      return;
    }
    this.numThreads = numThreads;
  }
An In-Memory store that does not keep track of the procedures inserted.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/store/NoopProcedureStore.java