ghalliday/HPCC-Platform — comment on commit e686f1a6d3fab0e463f4606f5f89194345b6b9a3
File: roxie/ccd/ccdqueue.cpp line 37
By richardkchapman:

The one in udpmskpck is also a message unpacker...

They really only affect tracing if they are not registered, but I'd go for 0 as slightly less liable to confuse than 1