Samuel Merritt 29544a9e17 Use smaller quorum size in proxy for even numbers of replicas ...

Requiring 2/2 backends for PUT requests means that the cluster can't
tolerate a single failure. Likewise, if you have 4 replicas in 2
regions, requiring 3/4 on a POST request means you cannot POST with
your inter-region link down or congested.

This changes the (replication) quorum size in the proxy to be at least
half the nodes instead of a majority of the nodes.

Daemons that were looking for a majority remain unchanged. The
container reconciler, replicator, and updater still require majorities
so their functioning is unchanged.

Odd numbers of replicas are unaffected by this commit.

Change-Id: I3b07ff0222aba6293ad7d60afe1747acafbe6ce4

2016-04-27 16:59:00 -05:00

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