What is the best number for titan partitions? (0.5.3)

[Fisher]

In a 5 billion edge graph, what is the best number for titan partitions?

Does it have to be equals to the cassandra token count?  256 is recommended for cassandra token count, so cluster.max-partitions should be 256, is it correct?

Thanks,

[Dan LaRocque]

Hi Fisher,

cluster.max-partitions should theoretically be greater than or equal to the number of physical nodes.  It currently must be less than or equal to 2^16.  It does not have to be equal to the Cassandra token count.

IIRC, cassandra.yaml's num_tokens is interpreted differently from Titan's cluster.max-partitions.  I think num_tokens specifies the number of tokens per machine.  cluster.max-partitions specifies the total number of partitions in the cluster (it's divided among all machines).

thanks,
Dan

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