public Guid ProcessUpdate(ClusterSparqlTransaction txn)
{
if (_state != CoreState.RunningMaster)
{
throw new NotMasterException();
}
// Do some validation
// Check store exists
txn.JobId = Guid.NewGuid();
txn.PrevTxnId = _storeInfo[txn.StoreId].Queue(txn.JobId);
_serverCore.QueueUpdate(txn.JobId, txn.StoreId, txn.Expression);
_nodeComms.SendTransactionToSlaves(txn);
return(txn.JobId);
}