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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9161) Add random interleaving for flush/compaction when running CQL unit tests
Date Wed, 02 Mar 2016 17:04:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175991#comment-15175991
] 

Benjamin Lerer commented on CASSANDRA-9161:
-------------------------------------------

{quote}Just to clarify, we're talking about unit tests here.{quote}
I know. I was just mentioning them because of the problems we faced with upgrade tests due
to the randomness of how the data is distributed.

{quote}To be clear, that ticket wasn't trying to suggest we randomize absolutely everything.{quote}

I know that a lot of thing cannot be randomize. I am absolutly not in favor of random testing.
For flushing, the main problem that I have seen is that only the read or write path for memtables
was tested not the one for SSTables. This problem is for me a problem of test coverage (we
are not testing properly some part of the code). Personnaly, I would prefer to have a tool
able to detect that type of issues than having some random flushes. Now, it is possible that
you have other problems in mind which my be more difficult to discover. 



> Add random interleaving for flush/compaction when running CQL unit tests
> ------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9161
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9161
>             Project: Cassandra
>          Issue Type: Test
>            Reporter: Sylvain Lebresne
>              Labels: retrospective_generated
>
> Most CQL tests don't bother flushing, which means that they overwhelmingly test the memtable
path and not the sstables one. A simple way to improve on that would be to make {{CQLTester}}
issue flushes and compactions randomly between statements.



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