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From "Aleksey Yeschenko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13913) Be more optimistic when fetching more rows for SRP
Date Fri, 29 Sep 2017 19:45:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aleksey Yeschenko updated CASSANDRA-13913:
------------------------------------------
    Fix Version/s:     (was: 3.11.1)
                       (was: 3.0.15)
                   3.11.x
                   3.0.x

> 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.x, 3.11.x
>
>
> 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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