[nginx] Upstream keepalive: keepalive_requests directive.
mdounin at mdounin.ru
Sun Aug 12 12:41:57 UTC 2018
On Fri, Aug 10, 2018 at 01:50:04PM -0700, Robert Paprocki wrote:
> Quite the patch. I recall this behavior being discussed a number of times
> in the past.
> Question: why the default of 100? This feels like a significantly breaking
> change wrt. the previous behavior. Are there any plans for advanced
> communication regarding this change, outside of a nominal changelog entry
> (e.g., "introduced 'keepalive_requests' directive")?
The default is 100 to match the same default of the client-side
keepalive_requests, see http://nginx.org/r/keepalive_requests.
Also, it is believed that 100 is a good enough number for most
setups. While it may be somewhat low for some extreme
configurations, it can be easily adjusted using the directive.
I don't think that your concerns about "breaking change" are
relevant, especially keeping in mind that a) upstream keepalive is
off by default and b) event with upstream keepalive configured,
requests can easily re-open or close connections for various other
reasons, in particular - due to limited number of connections
which are kept in the cache. Even assuming ideal conditions,
this change can only affect 1 percent of requests.
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