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Additional connections reuse.

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If ngx_drain_connections() fails to immediately reuse any connections
and there are no free connections, it now additionally tries to reuse
a connection again.  This helps to provide at least one free connection
in case of HTTP/2 with lingering close, where merely trying to reuse
a connection once does not free it, but makes it reusable again,
waiting for lingering close.
This commit is contained in:
Maxim Dounin 2021-02-11 21:52:11 +03:00
parent fb2a2152d7
commit 9a3ec20232
1 changed files with 16 additions and 0 deletions
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16
src/core/ngx_connection.c
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@ -1310,6 +1310,7 @@ ngx_drain_connections(ngx_cycle_t *cycle)
cycle->connection_n);
}
c = NULL;
n = ngx_max(ngx_min(32, cycle->reusable_connections_n / 8), 1);
for (i = 0; i < n; i++) {
@ -1326,6 +1327,21 @@ ngx_drain_connections(ngx_cycle_t *cycle)
c->close = 1;
c->read->handler(c->read);
}
if (cycle->free_connection_n == 0 && c && c->reusable) {
/*
* if no connections were freed, try to reuse the last
* connection again: this should free it as long as
* previous reuse moved it to lingering close
*/
ngx_log_debug0(NGX_LOG_DEBUG_CORE, c->log, 0,
"reusing connection again");
c->close = 1;
c->read->handler(c->read);
}
}