reducing n_val

Simon Effenberg seffenberg at team.mobile.de
Tue Jul 16 08:32:57 EDT 2013


Hi @list,

is it possible to reduce the n_val? I mean you can change it but what
happens then?

- is old data removed or is it laying around? (or maybe deleted after
  some time thanks to AAE?)

- is it causing problems like:
  - reducing n_val from 3 to 2
  - update data
  - sleep 10minutes
  - read data but second primary is borked => is the first fallback
    vnode on the place where the 3rd n_val vnode was before? So is this
    reading old crappy data (maybe the vclock is rescuing there but
    that's only one edge case I can think off right now)?

Cheers
Simon




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