@Override
  public String toString() {
    return new ToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).append("running", running)
      .build();
  }
Wakes up given waiting procedures by pushing them back into scheduler queues.
@return size of given {@code waitQueue}.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/AbstractProcedureScheduler.java