protected synchronized void setChildrenLatch(int numChildren) {
    this.childrenLatch = numChildren;
    if (LOG.isTraceEnabled()) {
      LOG.trace("CHILD LATCH INCREMENT SET " + this.childrenLatch, new Throwable(this.toString()));
    }
  }
Called by the ProcedureExecutor on procedure-load to restore the latch state
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/Procedure.java