Benedict created CASSANDRA-7519:
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Summary: Further stress improvements to generate more realistic
workloads
Key: CASSANDRA-7519
URL: https://issues.apache.org/jira/browse/CASSANDRA-7519
Project: Cassandra
Issue Type: Bug
Components: Tools
Reporter: Benedict
Assignee: Benedict
Priority: Minor
Fix For: 2.1.0
We generally believe that the most common workload is for reads to
exponentially prefer most recently written data. However as stress currently
behaves we have two id generation modes: sequential and random (although random
can be distributed). I propose introducing a new mode which is somewhat like
sequential, except we essentially 'look back' from the current id by some
amount defined by a distribution. I may possibly make the position only
increment as it's first written to also, so that this mode can be run from a
clean slate with a mixed workload. This should allow is to generate workloads
that are more representative.
At the same time, I will introduce a timestamp value generator for primary key
columns that is strictly ascending, i.e. has some random component but is based
off of the actual system time (or some shared monotonically increasing state)
so that we can again generate a more realistic workload. This may be
challenging to tie in with the new procedurally generated partitions, but I'm
sure it can be done without too much difficulty.
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