static GrantorInfo peekGrantor(DLockService service, InternalDistributedSystem sys) {
    return basicOp(-1, service, -1, sys, null, PEEK_OP);
  }
Asks the elder who the grantor is for the specified service.

@param service the service we want to know the grantor of.
@param sys th distributed system
@return information describing the current grantor of this service and if recovery is needed
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/GrantorRequestProcessor.java