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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8773) cassandra-stress should validate its results in "user" mode
Date Tue, 24 Mar 2015 15:39:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14378037#comment-14378037
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Benedict commented on CASSANDRA-8773:
-------------------------------------

Just to elaborate a little on how this works: much like "insert" is a special kind of operation,
"validate" is now another special kind of operation, which with equal probability runs one
of a range of possible queries against the database for which it can reliably construct the
result it should expect. This set of queries is: a whole partition retrieval, an (inclusive
LB, exclusive UB) query on clustering prefixes, and all four possible inclusive/exclusive
LB/UB on a full clustering column provision. Only actual values present for the partition
are provided for each parameter, and the value is selected at random. Ultimately we should
support arbitrary value provision, including present or not-present values, and all possible
inclusive/exclusive combinations. But this should suffice to stretch the system more than
is currently the case. Its main problematic constraint is that the dataset be fully populated
before starting. It can support overwrites (so a mixed workload of inserts can be run), but
since the data is only overwriting like data this constraints the usefulness of the validation.
This should all be solved in CASSANDRA-8986.

> cassandra-stress should validate its results in "user" mode
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-8773
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8773
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Benedict
>            Assignee: Benedict
>              Labels: stress
>             Fix For: 2.1.4
>
>




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