When offline, we check at regular intervals to see if the backend
has come back online. This means that every n seconds (the online
check interval), NSS requests may lag as we attempt to go out to
the remote server and update the cache.
With this patch, we will now always return the cached data while
we are offline and queue up an out-of-band cache refresh to
determine whether the data provider is back online.
--
Stephen Gallagher
RHCE 804006346421761
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