Upgrade From 2.0 to 2.1

[shalom sagges]

Hi All,

I've successfully upgraded a 2.0 cluster to 2.1 on the way to upgrade to
3.11 (hopefully 3.11.4 if it'd be released very soon).

I have 2 small questions:

   1. Currently the Datastax clients are enforcing Protocol Version 2 to
   prevent mixed cluster issues. Do I need now to enforce Protocol Version 3
   while upgrading from 2.1 to 3.11 or can I still use Protocol Version 2?

   2. After the upgrade, I found that system table NodeIdInfo has not been
   upgraded, i.e. I still see it in *-jb-* convention. Does this mean that
   this table is obsolete and can be removed?


Thanks!