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https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170487#comment-13170487
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Jonathan Ellis commented on CASSANDRA-2749:
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It might be worth adding a "are my filenames going to be too large" check
against all KS + CF combinations before starting to migrate data files around,
though. It would suck to end up with a partially converted database if some
short CF names complete early on, before erroring out on a long one.
> fine-grained control over data directories
> ------------------------------------------
>
> Key: CASSANDRA-2749
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2749
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Priority: Minor
> Fix For: 1.1
>
> Attachments:
> 0001-Make-it-possible-to-put-column-families-in-subdirect.patch,
> 0001-add-new-directory-layout.patch,
> 0001-non-backwards-compatible-patch-for-2749-putting-cfs-.patch.gz,
> 0002-fix-unit-tests.patch, 2749.tar.gz, 2749_backwards_compatible_v1.patch,
> 2749_backwards_compatible_v2.patch, 2749_backwards_compatible_v3.patch,
> 2749_backwards_compatible_v4.patch,
> 2749_backwards_compatible_v4_rebase1.patch, 2749_not_backwards.tar.gz,
> 2749_proper.tar.gz
>
>
> Currently Cassandra supports multiple data directories but no way to control
> what sstables are placed where. Particularly for systems with mixed SSDs and
> rotational disks, it would be nice to pin frequently accessed columnfamilies
> to the SSDs.
> Postgresql does this with tablespaces
> (http://www.postgresql.org/docs/9.0/static/manage-ag-tablespaces.html) but we
> should probably avoid using that name because of confusing similarity to
> "keyspaces."
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