tree 2eedc99f6749ceb90edaae9bc7beb1782e51c821
parent a9b6bda45559b9c4ee6ae6bcb5945365fa8d0e56
author Keegan Carruthers-Smith <keegan.csmith@gmail.com> 1581355046 +0000
committer Keegan Carruthers-Smith <keegan.csmith@gmail.com> 1581520457 +0000

shards: cache ranked slice

On a search request we construct and sort a slice of all shards to
search. This change will cache the slice. We do the caching on the read path
to avoid holding the exclusive lock for a long time when we do writes to the
shard map.

The use of a "rankedVersion" is a bit fiddly. Alternatively we could look
making the replace call a batch version to amortize the cost of creating the
ranked slice.

Change-Id: I5272dbb75a4becebb8aa8727d8459d0666cb9bf9