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From "Jonathan Shook (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7666) Range-segmented sstables
Date Sat, 20 Dec 2014 00:12:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14254330#comment-14254330
] 

Jonathan Shook commented on CASSANDRA-7666:
-------------------------------------------

It might simply be easier to explain to users how it works, relative to DTCS, specifically
because of clearer semantics of segmenting by field values. I believe a similar mechanism
is used in influx for automatically aging out expired time ranges. You could easily see "keep
last N months" style lifecycle management with this too, which wouldn't play well with other
layouts. I'm a fan of DTCS, however the conceptual clarity of this approach is far more appealing.


> Range-segmented sstables
> ------------------------
>
>                 Key: CASSANDRA-7666
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7666
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Sam Tunnicliffe
>             Fix For: 3.0
>
>
> It would be useful to segment sstables by data range (not just token range as envisioned
by CASSANDRA-6696).
> The primary use case is to allow deleting those data ranges for "free" by dropping the
sstables involved.  We should also (possibly as a separate ticket) be able to leverage this
information in query planning to avoid unnecessary sstable reads.
> Relational databases typically call this "partitioning" the table, but obviously we use
that term already for something else: http://www.postgresql.org/docs/9.1/static/ddl-partitioning.html
> Tokutek's take for mongodb: http://docs.tokutek.com/tokumx/tokumx-partitioned-collections.html



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