Cassandra vs MongoDB For Time Series Data

Re:Cassandra vs MongoDB For Time Series Data by nasalgoat on Thursday August 22, 2013 @11:50AM (#6257878)

Yes, but if I could replace the replicas and let them refill one at a time, then replace the masters, I could do a rolling conversion.

But replication from MongoDB to TokuDB does not work.

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Re:Cassandra vs MongoDB For Time Series Data by leif on Friday August 23, 2013 @02:17PM (#6265309)

Actually, you can do that. I wrote a tool to allow replication from MongoDB to TokuMX: http://www.tokutek.com/2013/07/tokumx-1-0-3-seamless-migrati.... It doesn't allow TokuMX instances to satisfy write concern or to participate in elections, but you can slave a TokuMX replica set off a MongoDB replica set just fine, and this allows you to do a rolling migration where you replace one secondary at a time.

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