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Increase swift replication factor for accounts
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The current swift replication factor for accounts is 3. As account was found to be one of the bottlenecks during the recent cache_upload outage, we should increase the replication factor to allow for more fan-out.

Before doing so in eqiad, the change should be tested in codfw, using ssbench to evaluate the impact.

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ema triaged this task as Medium priority.Jan 24 2017, 2:53 PM
ema added a project: Wikimedia-Incident.

I'm not sure how much this will actually help from the swift side (as opposed to frontend capacity, memcached, etc).
The account dbs are tiny, though, so it seems like a cheap thing to try...