Details
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Improvement
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Status: Open
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Normal
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Resolution: Unresolved
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None
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None
Description
One common difficulty with benchmarking machines is the amount of time it takes to initially load data. For machines with a large amount of ram this becomes especially onerous because a very large amount of data needs to be placed on the machine before page-cache can be circumvented.
To remedy this I suggest we add a top level flag to Cassandra-Stress which would cause the tool to write directly to sstables rather than actually performing CQL inserts. Internally this would use CQLSStable writer to write directly to sstables while skipping any keys which are not owned by the node stress is running on. The same stress command run on each node in the cluster would then write unique sstables only containing data which that node is responsible for. Following this no further network IO would be required to distribute data as it would all already be correctly in place.