[PATCH] Maintain a metadata copy outside the index (was Re: Datastore & backup - request for help)

[Benjamin M. Schwartz]

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Jameson "Chema" Quinn wrote:
|>> - at startup, if the file <datastore_path>/.metadata.exported doesn't
|>> exist, check how many objects need to get their metadata exported
|>> (0.8s for 3000 entries)
|> That's pretty good.
|>
|>> - in an idle callback, process each of those objects one per iteration
|>> (3ms per entry with simplejson, 2ms with cjson).
|> Exporting a few 100 per iteration probably is more efficient ;-)
|
|
| This brings up the issue of TamTam imperfect timing - it would be great if
| there were some way to turn off all unnecessary background CPU use for cases
| like TamTam. If so, I'd say 12*3ms is about the right size for a background
| click every second or two.
|

We are free to set nice values for each process as appropriate.  Backup
should obviously get a very high nice value.

- --Ben
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