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From "Chris Goffinet (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-299) make table directory creation lazy
Date Mon, 21 Sep 2009 03:50:18 GMT


Chris Goffinet commented on CASSANDRA-299:

Taking this over.

> make table directory creation lazy
> ----------------------------------
>                 Key: CASSANDRA-299
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Chris Goffinet
>            Priority: Minor
>             Fix For: 0.5
>         Attachments: 0001-lazy-creation-of-Table-dirs.-only-open-tables-that-h.patch
> checking that each subdir for each table is present on startup -- _every_ startup --
could be a real pita.
> i think that to support 100k tables (not impossible, in a hosted-cassandra-as-a-service
scenario) we're going to want to make table dir creation lazy.
> then we would want to make scanning for sstables faster by only doing one listdir call
per datadir, to see which table subdirs are present, and then checking only those for sstable
files.  this would involve some re-org of the onstart code.
> (note that we don't want to prune directories if there are no sstables left in them,
since we'd end up re-creating them at some point anyway; we just want to allow the lack of
a table subdir to imply the same thing as an empty one.)

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