On Wed, Oct 30, 2013 at 9:26 AM, Gustavo Niemeyer <gust...@niemeyer.net>wrote:
> On Wed, Oct 30, 2013 at 7:57 AM, John Arbash Meinel > <j...@arbash-meinel.com> wrote: > >> Where is N^2 coming from? > > > > If you add N units one-by-one each new add triggers all existing units > > to wake up and ask for the Life and CharmURL of the service again. So > > first unit asks, 2nd unit asks and causes the first unit to ask again. > > Why does it cause the first unit to ask again? Adding a unit should > not trigger watchers on the service to wake up. There are explicit > watches for being notified about new units. > The service watch fires on any change to the document, and adding a unit increments the service's unitcount field. The easy fix is to wrap the service watcher so that it discards irrelevant changes; the hard fix (schema change!) is to move the refcounts into their own docs, as we do elsewhere in state.
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