DynamoDB DAX

[Malcolm Edgar]

Does the DynamoDB DAX (https://aws.amazon.com/dynamodb/dax/) change
deployment architectures when using DynamoDB for storage. Is it still best
to use MemCache in front of DynamoDB ?

regards Malcolm

[Daniel Compton]

I had a small look at DAX and couldn't immediately see anything that it
would offer Datomic users over the equivalent sized memcached machine. It
looks like AWS is charging a 61% premium over the equivalent "bare" EC2
instance for DAX, compared to a 37% premium for Elasticache instances.

The one thing that might be enticing is the promised latency being in the
microseconds, instead of < 10 milliseconds for DynamoDB, but I suspect
there wouldn't be a lot in it between that and memcache.

The use cases for DAX
<http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.html#DAX.use-cases>
don't
really describe Datomic, and I wonder if Datomic's write pattern would be
sympathetic with DAX's expected access pattern. Because recent transactions
are distributed directly <http://docs.datomic.com/caching.html#memory-index>
to the peers, I don't know if there would be any benefit. It would
certainly be interesting to test though.

Post by Malcolm Edgar
Does the DynamoDB DAX (https://aws.amazon.com/dynamodb/dax/) change
deployment architectures when using DynamoDB for storage. Is it still best
to use MemCache in front of DynamoDB ?
regards Malcolm
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