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https://issues.apache.org/jira/browse/CASSANDRA-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Eriksson updated CASSANDRA-2749:
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Attachment: 0001-Make-it-possible-to-put-column-families-in-subdirect.patch
submitting a "working" patch for separating column families into
subdirectories, <ks>/<cf>/<cf>-xyz.db
There are alot of things to clean up/refactor, but submitting patch for
comments.
Unit tests work both for new-style dirs and old (except for a backup test that
i will fix when backups actually end up where they should).
TODO: (probably more than this)
- snapshots need to go into the <ks>/<cf>/snapshots dir since the purpose of
this patch is to make it possible to have the <cf>/ directory on a separate
drive
- incremental backups - same issue as for snapshots
- refactoring of Descriptor class, quite hairy now
- Disk space checking in column family subdirs
> 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
> Attachments:
> 0001-Make-it-possible-to-put-column-families-in-subdirect.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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