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From "Ben Slater (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8460) Make it possible to move non-compacting sstables to slow/big storage in DTCS
Date Mon, 26 Mar 2018 22:56:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16414719#comment-16414719
] 

Ben Slater commented on CASSANDRA-8460:
---------------------------------------

Think some more about this I think the other (and perhaps most important) advantage of implementing
in Cassandra is predictability for operators. It's easy to say, for example, if I want data
< 1 month old to be fast 1 need enough fast disk space for that and I know it will be consistently
fast after that I need X disk space for the older data and I know it will be slower (and can
even clearly tell users that). Trying to tune performance of the hot data (and avoid latency
spikes) with with Cassandra + LVM sounds pretty hard.

> Make it possible to move non-compacting sstables to slow/big storage in DTCS
> ----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8460
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8460
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Marcus Eriksson
>            Assignee: Lerh Chuan Low
>            Priority: Major
>              Labels: doc-impacting, dtcs
>             Fix For: 4.x
>
>
> It would be nice if we could configure DTCS to have a set of extra data directories where
we move the sstables once they are older than max_sstable_age_days. 
> This would enable users to have a quick, small SSD for hot, new data, and big spinning
disks for data that is rarely read and never compacted.



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