public boolean isRunning() {
    if (this.master == null || this.master.getMasterProcedureExecutor() == null) return false;
    return master.getMasterProcedureExecutor().isRunning();
  }
Get a thread pool for executing some asynchronous tasks
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.java