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Reuse of connections in lingering close.

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This is particularly important in HTTP/2, where keepalive connections
are closed with lingering.  Before the patch, reusing a keepalive HTTP/2
connection resulted in the connection waiting for lingering close to
remain in the reusable connections queue, preventing ngx_drain_connections()
from closing additional connections.

The patch fixes it by marking the connection reusable again, and so
moving it in the reusable connections queue.  Further, it makes actually
possible to reuse such connections if needed.
This commit is contained in:
Maxim Dounin 2021-02-11 21:52:09 +03:00
parent 327e21c432
commit fb2a2152d7
2 changed files with 8 additions and 2 deletions
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5
src/http/ngx_http_request.c
View File

@ -3437,6 +3437,9 @@ ngx_http_set_lingering_close(ngx_connection_t *c)
return;
}
c->close = 0;
ngx_reusable_connection(c, 1);
ngx_add_timer(rev, clcf->lingering_timeout);
if (rev->ready) {
@ -3461,7 +3464,7 @@ ngx_http_lingering_close_handler(ngx_event_t *rev)
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http lingering close handler");
if (rev->timedout) {
if (rev->timedout || c->close) {
ngx_http_close_request(r, 0);
return;
}

5
src/http/v2/ngx_http_v2.c
View File

@ -767,6 +767,9 @@ ngx_http_v2_lingering_close(ngx_connection_t *c)
return;
}
c->close = 0;
ngx_reusable_connection(c, 1);
ngx_add_timer(rev, clcf->lingering_timeout);
if (rev->ready) {
@ -791,7 +794,7 @@ ngx_http_v2_lingering_close_handler(ngx_event_t *rev)
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http2 lingering close handler");
if (rev->timedout) {
if (rev->timedout || c->close) {
ngx_http_close_connection(c);
return;
}