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Chris LuandGitHub
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* topology: keep per-node volume state with the location it describes The read-only and oversized indexes were maps from volume id to a list of the nodes reporting that state -- the same key space the lookup index already holds, kept a second and third time. Nothing ever asked which nodes; both are only ever asked whether any node does. So the state rides on the location list as a bit per entry, and the two indexes go. Removing a location shifts the bits with it, and a node replacing another at the same address inherits its slot, since that is what happens to the location too. 800k volumes, 90% read-only: readonly index 40.0MB -> 0, lookup index 42.5MB -> 48.6MB for the bits, 33.9MB net. * topology: rebuild the location flags when stale entries are dropped Refresh rebuilds the location list, so leaving the flags alone left bits describing whoever moved into the dropped entries' place. * topology: assert the refreshed flag survived, not just that it moved Clearing the mask rather than rebuilding it would have passed: the check that the flag lands on the right location is done by clearing it, which an already empty mask satisfies.