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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13913) Be more optimistic when fetching more rows for SRP
Date Wed, 27 Sep 2017 20:18:00 GMT
Aleksey Yeschenko created CASSANDRA-13913:
---------------------------------------------

             Summary: Be more optimistic when fetching more rows for SRP
                 Key: CASSANDRA-13913
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13913
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Aleksey Yeschenko
            Assignee: Aleksey Yeschenko
             Fix For: 3.0.15, 3.11.1


CASSANDRA-13794 fixed the issue with fetching at most 1 extra row for SRP by instead fetching
the per partition limit (if set) or global limit (if not). As noticed, however, it might be
a bit too pessimistic, and double the load even when are only missing an extra row.

Before 3.0.15 with that change is released, I'd like to make a small change, so nobody gets
surprised by sudden load increases. We'd start with {{2 * (limit - counted)}} and if that's
not enough, exponentially increase # of extra rows fetched until we hit {{limit}}.



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