We use Cassandra 3.5 + Spark 1.6.1 in 2-node cluster (8 cores and 1g memory per node). There is the following Cassandra tableAnd I want to calculate percentage of volume: sum of all volume from trades in the relevant security during the time period groupped by exchange and time bar (1 or 5 minutes). I've created an example:32.5 s is normal?
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