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https://issues.apache.org/jira/browse/CASSANDRA-10156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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T Jake Luciani updated CASSANDRA-10156:
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Component/s: Coordination
> Creating Materialized views concurrently leads to missing data
> --------------------------------------------------------------
>
> Key: CASSANDRA-10156
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10156
> Project: Cassandra
> Issue Type: Bug
> Components: Coordination
> Reporter: Alan Boudreault
> Assignee: T Jake Luciani
> Fix For: 3.0 beta 2
>
> Attachments: mv_test_bad.sh, mv_test_good.sh
>
>
> [~nutbunnies] was writing dtests that create multiple tables concurrently. He
> also wrote a test that creates multiple MV but has not been able to get it
> works properly. After some debugging outside of dtest, it seems that there is
> an issue if we create more than 1 MV at the same time. There is no errors in
> the log but the MV are never entirely populated and are missing data.
> I've attached 2 scripts:
> [^mv_test_bad.sh]: is the one that reproduce the issue. It creates 4 MVs at
> the same time. At the end, some data are missing in the MVs and there is
> nothing in system.hints or system.batchlog.
> [^mv_test_good.sh]: is the same script but that waits 10 seconds between each
> MV creation, which results in 4 MVs with all the data.
> Some more notes from Andrew:
> {code}
> - lowering the number of rows inserted below ~1000 won't exhibit the
> inconsistent behavior
> - adding more columns/MV make it worse -- more of the MVs counts are
> consistently wrong
> - multiple runs will range in disagreement -- usually one of the MVs is
> correct though
> - the describe cluster and system.mv* queries always "look" good
> {code}
> Thanks Andrew for finding this bug and providing the test scripts!
> //cc [~carlyeks] [~tjake] [~enigmacurry]
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