* When cluster or partition is not hosted in this instance.
*/
private RegInfo getV2PartitionRegistration(String cluster, long partition) throws RequestProcessingException
{
DatabusV2ClusterRegistrationImpl reg = getV2ClusterRegistration(cluster);
DbusPartitionInfo p = new DbusPartitionInfoImpl(partition);
DatabusRegistration r = reg.getPartitionRegs().get(p);
if (null == r)
throw new RequestProcessingException("Partition(" + partition + ") for cluster ("
+ cluster + ") not found !!");