GWicke added a comment.

In https://phabricator.wikimedia.org/T86561#971491, @JanZerebecki wrote:

> Do we want to have the Cassandra and Titan nodes be in the same rack as I 
> assume that query performance is very latency sensitive?


I don't think that there is a huge enough difference in latency between rows 
that would make it worth compromising availability. Cassandra nodes are spread 
out across racks (rows in our case) in order to improve availability by 
avoiding correlated failures that affect a single row. We should do the same 
for the Titan nodes.


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  https://phabricator.wikimedia.org/T86561

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To: Joe, GWicke
Cc: Aklapper, GWicke, Smalyshev, Manybubbles, JanZerebecki, jkroll, 
Wikidata-bugs, RobH, aude, daniel, mark, Joe, chasemp



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