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From "Pavel Yaskevich (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2749) fine-grained control over data directories
Date Tue, 08 Nov 2011 20:49:52 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13146556#comment-13146556
] 

Pavel Yaskevich commented on CASSANDRA-2749:
--------------------------------------------

I don't really like the idea of keeping a map of all generates for each of ks/cf and updating
it all the time (this also implies that we need to resize it after cf is created/dropped).
After re-thinking this once again it feels like we really should just make a tool to transfer
SSTable to separate directories and back, make a flag in config that will indicate old/new
style of file structure, because I don't see a error-prone way to handle this when old/new
style SSTables are mixed...
                
> 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
>            Assignee: Marcus Eriksson
>            Priority: Minor
>             Fix For: 1.1
>
>         Attachments: 0001-Make-it-possible-to-put-column-families-in-subdirect.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
>
>
> 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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