[tahoe-dev] [tahoe-lafs] #830: review Brian's patches for #607

[tahoe-lafs]

#830: review Brian's patches for #607
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 Reporter:  zooko          |           Owner:  zooko   
     Type:  defect         |          Status:  assigned
 Priority:  critical       |       Milestone:  1.6.0   
Component:  code-dirnodes  |         Version:  1.5.0   
 Keywords:  review-needed  |   Launchpad_bug:          
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Comment(by warner):

 Yeah, the first run with the new immutable-directory code will have to re-
 upload all of your directories, so you should see a slowdown on the first
 run. But after that, the second and later runs should be super quick, much
 faster than the second-and-later runs of the old (mutable directory) code,
 because the immutable-directory code will be doing fast sqlite lookups
 instead of a bunch of tahoe-side directory reads.

 If you keep seeing slowdowns and can confirm that nothing much has changed
 between subsequent runs, let's take a look at the SQL schema and make sure
 we're not missing an index on something important.

 I'll add a note to the release notes to prepare folks for this change and
 for the initial slowdown.

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Ticket URL: <http://allmydata.org/trac/tahoe/ticket/830#comment:7>
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