make table directory creation lazy
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Key: CASSANDRA-299
URL: https://issues.apache.org/jira/browse/CASSANDRA-299
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Priority: Minor
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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