if (!canProceed) {
// TODO: instead, we could convert append/increment to get w/mvcc
String message = "The operation with nonce {" + nonceGroup + ", " + mutation.getNonce()
+ "} on row [" + Bytes.toString(mutation.getRow().toByteArray())
+ "] may have already completed";
throw new OperationConflictException(message);
}
return mutation.getNonce();
}