child process restarts frequently
havard.futseter at met.no
Thu Jul 19 17:29:16 CEST 2007
Dag-Erling Smørgrav wrote:
> Håvard Futsæter <havard.futseter at met.no> writes:
>> Might this perhaps be an indication that Varnish gets into trouble
>> when it receives a request for a resource while the cached object for
>> this resource is beeing recycled?
> Sounds like it. Poul-Henning, could you take a closer look at the
> locking in the expiry code?
Hi. I have some more information regarding the above mentioned problem:
We now think the restart is caused by a conflict between the purging
routine and the timeout routine.
We have the following scenario:
1. url.purge <regexp>.
2. An object that will be affected by the purge times out and is discarded.
3. AFTER ExpPick, but BEFORE ExpKill, there is a request for the same
object. The object is consequently banned.
4. Immediately after this ban the child process restarts.
Perhaps the expire-system tries to move the object to deathrow twice?
For testing purposes we have temporarily removed the url.purge command,
and have seen no restart after this was done.
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