public static ThreadPoolExecutor defaultPool(String coordName, int opThreads) {
    return defaultPool(coordName, opThreads, KEEP_ALIVE_MILLIS_DEFAULT);
  }
Default thread pool for the procedure
@param opThreads the maximum number of threads to allow in the pool
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/ProcedureCoordinator.java