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- ares__send_query() now varies the retry timeout pseudo-randomly to avoid

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packet storms when several queries were started at the same time.
This commit is contained in:
Phil Blundell 2009-01-13 11:51:04 +00:00
parent 87c71953be
commit 35d8fb0501
2 changed files with 9 additions and 2 deletions
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6
ares/CHANGES
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@ -1,6 +1,10 @@
Changelog for the c-ares project
* January 11 2008 (Daniel Stenberg)
* January 13 2009 (Phil Blundell)
- ares__send_query() now varies the retry timeout pseudo-randomly to avoid
packet storms when several queries were started at the same time.
* January 11 2009 (Daniel Stenberg)
- Phil Blundell added the internal function ares__expand_name_for_response()
that is now used by the ares_parse_*_reply() functions instead of the
ares_expand_name() simply to easier return ARES_EBADRESP for the cases where

5
ares/ares_process.c
View File

@ -715,6 +715,7 @@ void ares__send_query(ares_channel channel, struct query *query,
{
struct send_request *sendreq;
struct server_state *server;
int timeplus;
server = &channel->servers[query->server];
if (query->using_tcp)
@ -778,9 +779,11 @@ void ares__send_query(ares_channel channel, struct query *query,
return;
}
}
timeplus = channel->timeout << (query->try / channel->nservers);
timeplus = (timeplus * (9 + (rand () & 7))) / 16;
query->timeout = *now;
ares__timeadd(&query->timeout,
channel->timeout << (query->try / channel->nservers));
timeplus);
/* Keep track of queries bucketed by timeout, so we can process
* timeout events quickly.
*/