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[nginx] Upstream: fixed tcp_nopush with gRPC.

Maxim Dounin
December 04, 2018 08:38AM
details: https://hg.nginx.org/nginx/rev/abe1b60c4213
branches: stable-1.14
changeset: 7411:abe1b60c4213
user: Maxim Dounin <mdounin@mdounin.ru>
date: Mon Jul 02 19:03:04 2018 +0300
description:
Upstream: fixed tcp_nopush with gRPC.

With gRPC it is possible that a request sending is blocked due to flow
control. Moreover, further sending might be only allowed once the
backend sees all the data we've already sent. With such a backend
it is required to clear the TCP_NOPUSH socket option to make sure all
the data we've sent are actually delivered to the backend.

As such, we now clear TCP_NOPUSH in ngx_http_upstream_send_request()
also on NGX_AGAIN if c->write->ready is set. This fixes a test (which
waits for all the 64k bytes as per initial window before allowing more
bytes) with sendfile enabled when the body was written to a file
in a different context.

diffstat:

src/http/ngx_http_upstream.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)

diffs (22 lines):

diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2008,6 +2008,18 @@ ngx_http_upstream_send_request(ngx_http_
return;
}

+ if (c->write->ready && c->tcp_nopush == NGX_TCP_NOPUSH_SET) {
+ if (ngx_tcp_push(c->fd) == -1) {
+ ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
+ ngx_tcp_push_n " failed");
+ ngx_http_upstream_finalize_request(r, u,
+ NGX_HTTP_INTERNAL_SERVER_ERROR);
+ return;
+ }
+
+ c->tcp_nopush = NGX_TCP_NOPUSH_UNSET;
+ }
+
return;
}

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[nginx] Upstream: fixed tcp_nopush with gRPC.

Maxim Dounin 37 December 04, 2018 08:38AM



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