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minor note in UPGRADING.md
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@ebuchman
ebuchman committed Sep 7, 2018
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Expand Up @@ -53,7 +53,11 @@ the `ValidatorUpdate` type, which contains just the `PubKey`.
Validator set updates returned in ResponseEndBlock for height `H` used to take
effect immediately at height `H+1`. Now they will be delayed one block, to take
effect at height `H+2`. Note this means that the change will be seen by the ABCI
app in the `RequestBeginBlock.LastCommitInfo` at block `H+3`.
app in the `RequestBeginBlock.LastCommitInfo` at block `H+3`. Apps were already
required to maintain a map from validator addresses to pubkeys since v0.23 (when
pubkeys were removed from RequestBeginBlock), but now they may need to track
multiple validator sets at once to accomodate this delay.


### Block Size

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