}
LOG.info(master.getClientIdAuditPrefix() + " procedure request for: "
+ desc.getSignature());
byte[] data = mpm.execProcedureWithRet(desc);
ExecProcedureResponse.Builder builder = ExecProcedureResponse.newBuilder();
// set return data if available
if (data != null) {
builder.setReturnData(ByteString.copyFrom(data));