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Hash : 1e56a32d
Author :
Date : 2009-12-29T16:04:16
Make the initial nameserver probe timeout configurable. When we decide that a nameserver is down, we stop sending queries to it, except to periodically probe it to see if it has come back up. Our previous probe sechedule was an ad-hoc and hard-wired "10 seconds, one minute, 5 minues, 15 minutes, 1 hour, 1 hour, 1 hour...". There was nothing wrong with having it be ad-hoc, but making it hard-wired served no good purpose. Now the user can set the initial timeout via a new "initial-probe-timeout:" option; future timeouts back off by a factor of 3 on every failure to a maximum of 1 hour. As a side-benefit, this lets us cut the runtime of the dns/retry test from about 40 seconds to about 3 seconds. Faster unit tests are always a good thing.
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