Hi list-users,
We have an application that has a relatively unusual access pattern in
cassandra 1.1.6
Essentially we read an entire multi hundred megabyte column family
sequentially (little chance of a cassandra cache hit), perform some
operations on the data, and write the data back to another column family
in the same keyspace.
We do about 250 writes/sec and 100 reads/sec during this process. Write
request latency is about 900 microsecs, read request latency is about
4000 microsecs.
* First Question: Do these numbers make sense?
read-request latency seems a little high to me, cassandra hasn't had a
chance to cache this data, but it's likely in the Linux disk cache,
given the sizing of the node/data/jvm.
thanks
James M
