* storage: order VolumeInfo by alignment
The struct is held for every volume replica in the cluster, so the padding the
compiler inserts is multiplied by however many volumes a master tracks. Two
one-byte fields each sat at the head of a word and left the rest of it empty,
which was ten of the eighteen wasted bytes.
Grouping by size rather than by meaning takes the struct from 152 bytes to 136,
and the map holding them shrinks with it, since a Go map's slack scales with
the size of the value.
800k volumes registered from a heartbeat that has been over the wire:
211 -> 195 B/volume, 214 -> 198 tiered.
* trim the comments on this change to the parts that are not evident
Chris LuandGitHub
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