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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6477) Materialized Views (was: Global Indexes)
Date Fri, 17 Jul 2015 15:01:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14631436#comment-14631436
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Sylvain Lebresne commented on CASSANDRA-6477:
---------------------------------------------

bq. Pedantically you are correct. Which is why I said "effectively" and not "literally."

Well, I mean, CL is always more about "when does we answer the client" than "what amount of
work we do internally". Every write is always written to every replica for instance, the CL
is just a matter of how long we wait before answering the client. I'm arguing this is very
exactly the case here too. Anyway, your "the other side of that coin" made it sounds like
we were doing unusual regarding the CL, something that may not be desirable. I don't understand
what that is if that's the case.

> Materialized Views (was: Global Indexes)
> ----------------------------------------
>
>                 Key: CASSANDRA-6477
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6477
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Carl Yeksigian
>              Labels: cql
>             Fix For: 3.0 beta 1
>
>         Attachments: test-view-data.sh, users.yaml
>
>
> Local indexes are suitable for low-cardinality data, where spreading the index across
the cluster is a Good Thing.  However, for high-cardinality data, local indexes require querying
most nodes in the cluster even if only a handful of rows is returned.



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