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From "Sylvain Lebresne (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2749) fine-grained control over data directories
Date Thu, 15 Dec 2011 20:41:30 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170480#comment-13170480
] 

Sylvain Lebresne commented on CASSANDRA-2749:
---------------------------------------------

bq. guess we need to supply a tool to rename sstables files if anyone is on longer names?

We probably don't need to do anything. I don't think anyone is really using names long enough
for them to it the file system limit, the goal of limiting the names is just so to prevent
this from happening but there will be no other assumption that the names are short from the
code.

I also don't think anything will prevent rolling upgrades, do you had something in mind?

Note: I have a long flight ahead of me so I plan to update my last patch with both those changes,
as I still like the moving of all the directories handling in a dedicated class, even if we
don't support both layout.
                
> 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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