@Override
  public int hashCode() {
    return this.getProcedureSignature().hashCode();
  }
Return the unique signature of the procedure. This signature uniquely identifies the procedure.
By default, this signature is the string used in the procedure controller (i.e., the root ZK
node name for the procedure)
hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/ProcedureManager.java