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Print state of connection buffer when no response is receioved from PS for a long time (#11145)

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## Problem

See https://neondb.slack.com/archives/C08DE6Q9C3B

Sometimes compute is not able to receive responses from PS for a long
time (minutes).
I do not think that the problem is at compute side, but in order to
exclude this possibility I wan to see more information about connection
state at compute side, particularly amount of data cached in connection
buffer.

## Summary of changes

Right now we are dumping state of socket buffer.
This PR adds printing state of connection buffer.

---------

Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>
This commit is contained in:
Konstantin Knizhnik
2025-03-09 20:36:36 +02:00
committed by GitHub
parent 1b8c4286c4
commit c87d307e8c
1 changed files with 5 additions and 2 deletions
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7
pgxn/neon/libpagestore.c
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@@ -16,6 +16,8 @@
#include <math.h>
#include "libpq-int.h"
#include "access/xlog.h"
#include "common/hashfn.h"
#include "fmgr.h"
@@ -815,9 +817,10 @@ retry:
get_socket_stats(PQsocket(pageserver_conn), &sndbuf, &recvbuf);
neon_shard_log(shard_no, LOG,
"no response received from pageserver for %0.3f s, still waiting (sent " UINT64_FORMAT " requests, received " UINT64_FORMAT " responses) (socket sndbuf=%d recvbuf=%d)",
"no response received from pageserver for %0.3f s, still waiting (sent " UINT64_FORMAT " requests, received " UINT64_FORMAT " responses) (socket sndbuf=%d recvbuf=%d) (conn start=%d end=%d)",
INSTR_TIME_GET_DOUBLE(since_start),
shard->nrequests_sent, shard->nresponses_received, sndbuf, recvbuf);
shard->nrequests_sent, shard->nresponses_received, sndbuf, recvbuf,
pageserver_conn->inStart, pageserver_conn->inEnd);
shard->receive_last_log_time = now;
shard->receive_logged = true;
}