Pooler error server conn crashed

2018-12-10 20:56:59.349 8659 WARNING C-0x1b44e68: ckandb/ckandb_user@127.0.0.1:46198 pooler error: server conn crashed? Sometimes i have network problems and the server side postgres loses connecti...

Is pgbouncer capable of handling a crashed server connection in this case, without causing an exception with the app itself?

I am seeing this sporadically on GCP, using a simple config like this:

[pgbouncer]
…
max_db_connections = 90
default_pool_size = 90
max_client_conn = 100
log_connections = 0
log_disconnections = 0

It looks like «server conn crashed» usually would happen when reading fails:

case SBUF_EV_RECV_FAILED:
disconnect_server(server, false, «server conn crashed?«);
break;

— so it is not related to creating a connection only, and therefore it is not really possible to retry in this case always I assume.

The logs in this case:

2022/06/22 21:44:02 Reading data from project:region:service had error: read tcp 169.254.8.1:59950->34.77.237.33:3307: read: connection reset by peer
2022-06-22 21:44:02.583 UTC [11] WARNING C-0x7f0c538b8340: db/db-user@127.0.0.1:51448 pooler error: server conn crashed?
ERROR:xxx.healthcheck:get_db_status failed: django.db.utils.OperationalError(psycopg2.OperationalError): server conn crashed?
…
DEBUG:urllib3.connectionpool:Resetting dropped connection: o158426.ingest.sentry.io

Given that there is also a dropped connection with Sentry reporting the crash it looks like a generic network issue.

Noteworthy is that it happened later again, but without crashing the app apparently!?

2022/06/22 21:44:46 Reading data from project:region:service had error: read tcp 169.254.8.1:59290->34.77.237.33:3307: read: connection reset by peer
2022-06-22 21:44:46.470 UTC [11] WARNING C-0x7f0c538b8110: db/db-user@127.0.0.1:50590 pooler error: server conn crashed?

So here it was happening where it could be recovered from / retried then maybe?

Is there something that can be improved here?
I can see that there are situations where it is not possible to fix a broken a connection, but wonder if the current behavior is expected to be lived with?

For now I will try server_login_retry = 0 additionally, and see how it behaves.

Источник

Содержание

  1. Problem with 08P01: server conn crashed? #714
  2. Comments
  3. Versions
  4. Footer
  5. pooler error: server conn crashed? #347
  6. Comments
  7. Pooler Error: pgbouncer cannot connect to server #239
  8. Comments
  9. PgBouncer Connection Pooling: What to do when persistent connectivity is lost
  10. Pooler error server conn crashed

Problem with 08P01: server conn crashed? #714

When using PgBouncer, an error occurs periodically under load (example from a client application) — 08P01: server conn crashed?
General scheme: Client app (ORM) -> PgBouncer -> Postgresql (PgBouncer and Postgresql are on the same server)

Versions

App
.Net ORM + Npgsql.EntityFrameworkCore.PostgreSQL/5.0.2

PgBouncer
1.16.0
libevent 2.0.21-stable
adns: libc-2.17
tls: OpenSSL 1.0.2k-fips 26 Jan 2017

PostgreSQL
12.6 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit

PgBouncer config:

App

PgBouncer

Postgresql

The text was updated successfully, but these errors were encountered:

Just for reference: #347 (and my comment there: #347 (comment)).

For anyone running in to the same issue with Npgsql , we fixed it by turning off the pooling options that enable on default, by adding Pooling=false to the connection string. This is also suggested in their documentation. My guess is that Npgsql keeps some connections that was already closed by pgbouncer.

hi, i faced the issue and tried the solution Pooling=false, which seem to have helped. But then we switched from Azure Single Postgre server to Flexible Postgre with pgbouncer. it seems in flexible server this flag is affecting pgbouncer performance whenever there’s a high load as if pooling it not working properly and we get various connection timeout and drops. so removed it for now, and if the original issue appears again will see how else to fix. added instead ‘No Reset On Close=true’ in line with what’s mentioned here:
https://www.npgsql.org/doc/compatibility.html?q=pgbouncer

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Источник

pooler error: server conn crashed? #347

2018-12-10 20:56:59.349 8659 WARNING C-0x1b44e68: ckandb/ckandb_user@127.0.0.1:46198 pooler error: server conn crashed?

Sometimes i have network problems and the server side postgres loses connection to my app.

How can i set pgbouncer to reset the connections after a few seconds of this connection issue?

Right now it only reconnects if someone refreshes the web app, but i would like it to do this itself.

The text was updated successfully, but these errors were encountered:

I just bumped into a number of pooler error: server conn crashed? . For me, they were caused by Postgres’s idle_in_transaction_session_timeout — pgBouncer doesn’t seem to detect the reason why server dropped the connection and so reports this generic message.

I wonder if it would be possible to give more detailed error message in case connections gets dropped due to idle_in_transaction_session_timeout ?

There are various timeout settings that can help in case of network issues, such as query_timeout , query_wait_timeout , and client_idle_timeout . Which one of these is appropriate depends on the specific circumstances.

Also, the original reporter might be looking for the server_login_retry setting.

Also, the original reporter might be looking for the server_login_retry setting.

Is this supposed to be set to 0 then?
(Assuming / understanding it so that using the default of 15s means that it can take 15s to get a «server conn crashed?» error on successive retries)

server_login_retry is not directly related to «server conn crashed?». The original reporter asked

How can i set pgbouncer to reset the connections after a few seconds of this connection issue?

PgBouncer does that automatically. server_login_retry controls how quickly it will retry.

Is pgbouncer capable of handling a crashed server connection in this case, without causing an exception with the app itself?

I am seeing this sporadically on GCP, using a simple config like this:

It looks like «server conn crashed» usually would happen when reading fails:

Lines 534 to 536 in 9a346b0

case SBUF_EV_RECV_FAILED:
disconnect_server (server, false , » server conn crashed? » );
break ;

The logs in this case:

Given that there is also a dropped connection with Sentry reporting the crash it looks like a generic network issue.

Noteworthy is that it happened later again, but without crashing the app apparently!?

So here it was happening where it could be recovered from / retried then maybe?

Is there something that can be improved here?
I can see that there are situations where it is not possible to fix a broken a connection, but wonder if the current behavior is expected to be lived with?

For now I will try server_login_retry = 0 additionally, and see how it behaves.

Источник

Pooler Error: pgbouncer cannot connect to server #239

We are using pgbouncer on windows machine and postgress db on centos.
So problem is pgbouncer is failing intermittently, log says that ‘Pooler Error: pgbouncer cannot connect to server’

pgbouncer version : 1.7.1

Any help on this?

2017-09-29 05:04:30.159 2756 WARNING lookup failed: myhostname: result=11003
2017-09-29 05:04:30.159 2756 NOISE dns: deliver_info(myhostname) addr=NULL
2017-09-29 05:04:30.159 2756 LOG S-01022ce0: test/test@(bad-af):0 closing because: server dns lookup failed (age=3)
2017-09-29 05:04:30.159 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:30.486 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:30.820 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:31.155 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:31.489 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:31.823 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:32.157 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:32.491 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:32.825 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:33.159 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:33.493 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:33.827 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:34.161 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:34.495 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:34.829 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:35.163 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:35.497 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:35.831 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.165 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.351 2756 NOISE new fd from accept=612
2017-09-29 05:04:36.352 2756 DEBUG C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 P: got connection: 127.0.0.1:19939 -> 127.0.0.1:5432
2017-09-29 05:04:36.352 2756 NOISE safe_accept(524) = A non-blocking socket operation could not be completed immediately.
2017-09-29 05:04:36.352 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.353 2756 NOISE resync: done=0, parse=0, recv=0
2017-09-29 05:04:36.353 2756 NOISE C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 pkt=’!’ len=93
2017-09-29 05:04:36.353 2756 DEBUG C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 got var: user=testuser
2017-09-29 05:04:36.353 2756 DEBUG C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 got var: client_encoding=UTF8
2017-09-29 05:04:36.354 2756 DEBUG C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 got var: database=testdb
2017-09-29 05:04:36.354 2756 DEBUG C-00fec670: (nodb)/(nouser)@127.0.0.1:19939 using application_name: testApp
2017-09-29 05:04:36.354 2756 LOG C-00fec670: test/test@127.0.0.1:19939 login attempt: db=testdb user=testuser tls=no
2017-09-29 05:04:36.355 2756 LOG C-00fec670: test/test@@127.0.0.1:19939 closing because: pgbouncer cannot connect to server (age=0)
2017-09-29 05:04:36.355 2756 WARNING C-00fec670: test/test@@127.0.0.1:19939 Pooler Error: pgbouncer cannot connect to server
2017-09-29 05:04:36.355 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.356 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.499 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:36.833 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:37.167 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:37.501 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:37.835 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:38.169 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:38.503 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:38.837 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:39.171 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:39.505 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:39.839 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:40.173 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:40.507 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:40.841 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:41.175 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:41.509 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:41.843 2756 DEBUG launch_new_connection: last failed, wait
2017-09-29 05:04:42.177 2756 NOISE S-01022ce0: test/test@(bad-af):0 inet socket: myhostname
2017-09-29 05:04:42.177 2756 NOISE S-01022ce0: test/test@(bad-af):0 dns socket: myhostname
2017-09-29 05:04:42.177 2756 NOISE dns: deliver_info(myhostname) addr=NULL
2017-09-29 05:04:42.177 2756 LOG S-01022ce0: test/test@(bad-af):0 closing because: server dns lookup failed (age=0)

The text was updated successfully, but these errors were encountered:

Источник

PgBouncer Connection Pooling: What to do when persistent connectivity is lost

(This is part two of my technical response to a series of questions about the use of pgbouncer and what you need to look out for. Part one can be found here)

So, in Part One of this blog we completed the installation of PgBouncer, configuration and a brief network timeout using PgBouncer with no problem at all. But what happens with a minute’s downtime, and what if we’re in the middle of a transaction while it happens? Does PgBouncer maintain connectivity, without error, even when the connection to the database is catastrophically lost?

On our master database, we now start a session and issue a command.

On the target database box we take the NIC (network interface) down for a minute, and issue another command while connectivity is lost:

Meanwhile, back in PgBouncer:

. Which now hangs, however, when the database NIC is back up, psql returns.

Looks good! The SELECT is held in flight during the minute long network outage, and simply reconnects and completes when it can.

Now for something a little more advanced, let’s restart the database on the remote server, and see what happens.

A partial success. Our psql session connecting to PgBouncer was persistent, but we get an error message telling us that the server connection has been reset. However, immediately re-issuing the statement we get the result we want without having to reconnect to PgBouncer.

So, how do we avoid getting the error message about the server connection reset, and having to re-issue our statement?

Well, the simple answer is we change the ‘pool_mode’ = ‘transaction’.

This is taken from the official pgbouncer documentation (slightly amended)

Whether server_reset_query should be run in all pooling modes. When this setting is off (default), the server_reset_query will be run only in pools that are in sessions-pooling mode. Connections in transaction-pooling mode should not have any need for reset query.

It is a workaround for broken setups that run apps that use session features over transaction-pooled PgBouncer. It changes non-deterministic breakage to deterministic breakage — client always lose their state after each transaction.

So, this parameter would be a workaround for our problem while in session mode. But, do we want to hack a fix or do the right thing? Of course, we want to do the right thing, so we make our pool_mode (at a minimum) transaction level, which in turn should make our sessions persistent.

Therefore, rather than ‘fix’ our broken PgBouncer, we will do the sensible thing and move to transaction-level pooling:

. And restart PgBouncer.

And now, on the PgBouncer side, we reconnect and…

. And, on the database server:

. And then, back on the PgBouncer session again:

Success, once more. Next, we will go on to look at what to do if you have a complete failover.

Phil has 25 years experience working with relational database systems and is a Senior Consultant in the Professional Services Division of EnterpriseDB. Located in Sweden, Phil works mainly in EMEA (specifically the Nordics) but often spends time on client sites around the world, delivering training, .

Источник

Pooler error server conn crashed

2018-12-10 20:56:59.349 8659 WARNING C-0x1b44e68: ckandb/ckandb_user@127.0.0.1:46198 pooler error: server conn crashed?

Sometimes i have network problems and the server side postgres loses connection to my app.

How can i set pgbouncer to reset the connections after a few seconds of this connection issue?

Right now it only reconnects if someone refreshes the web app, but i would like it to do this itself.

Created at 6 months ago

I just bumped into a number of pooler error: server conn crashed? . For me, they were caused by Postgres’s idle_in_transaction_session_timeout — pgBouncer doesn’t seem to detect the reason why server dropped the connection and so reports this generic message.

I wonder if it would be possible to give more detailed error message in case connections gets dropped due to idle_in_transaction_session_timeout ?

Created at 3 years ago

There are various timeout settings that can help in case of network issues, such as query_timeout , query_wait_timeout , and client_idle_timeout . Which one of these is appropriate depends on the specific circumstances.

Created at 3 years ago

Also, the original reporter might be looking for the server_login_retry setting.

Created at 3 years ago

Also, the original reporter might be looking for the server_login_retry setting.

Is this supposed to be set to 0 then?
(Assuming / understanding it so that using the default of 15s means that it can take 15s to get a «server conn crashed?» error on successive retries)

Created at 8 months ago

server_login_retry is not directly related to «server conn crashed?». The original reporter asked

How can i set pgbouncer to reset the connections after a few seconds of this connection issue?

PgBouncer does that automatically. server_login_retry controls how quickly it will retry.

Created at 8 months ago

Is pgbouncer capable of handling a crashed server connection in this case, without causing an exception with the app itself?

I am seeing this sporadically on GCP, using a simple config like this:

It looks like «server conn crashed» usually would happen when reading fails:

Lines 534 to 536 in 9a346b0

case SBUF_EV_RECV_FAILED:
disconnect_server (server, false , » server conn crashed? » );
break ;

The logs in this case:

Given that there is also a dropped connection with Sentry reporting the crash it looks like a generic network issue.

Noteworthy is that it happened later again, but without crashing the app apparently!?

So here it was happening where it could be recovered from / retried then maybe?

Is there something that can be improved here?
I can see that there are situations where it is not possible to fix a broken a connection, but wonder if the current behavior is expected to be lived with?

For now I will try server_login_retry = 0 additionally, and see how it behaves.

Источник

Источник

Is pgbouncer capable of handling a crashed server connection in this case, without causing an exception with the app itself?

I am seeing this sporadically on GCP, using a simple config like this:

[pgbouncer]
…
max_db_connections = 90
default_pool_size = 90
max_client_conn = 100
log_connections = 0
log_disconnections = 0

It looks like «server conn crashed» usually would happen when reading fails:

case SBUF_EV_RECV_FAILED:
disconnect_server(server, false, «server conn crashed?«);
break;

— so it is not related to creating a connection only, and therefore it is not really possible to retry in this case always I assume.

The logs in this case:

2022/06/22 21:44:02 Reading data from project:region:service had error: read tcp 169.254.8.1:59950->34.77.237.33:3307: read: connection reset by peer
2022-06-22 21:44:02.583 UTC [11] WARNING C-0x7f0c538b8340: db/db-user@127.0.0.1:51448 pooler error: server conn crashed?
ERROR:xxx.healthcheck:get_db_status failed: django.db.utils.OperationalError(psycopg2.OperationalError): server conn crashed?
…
DEBUG:urllib3.connectionpool:Resetting dropped connection: o158426.ingest.sentry.io

Given that there is also a dropped connection with Sentry reporting the crash it looks like a generic network issue.

Noteworthy is that it happened later again, but without crashing the app apparently!?

2022/06/22 21:44:46 Reading data from project:region:service had error: read tcp 169.254.8.1:59290->34.77.237.33:3307: read: connection reset by peer
2022-06-22 21:44:46.470 UTC [11] WARNING C-0x7f0c538b8110: db/db-user@127.0.0.1:50590 pooler error: server conn crashed?

So here it was happening where it could be recovered from / retried then maybe?

Is there something that can be improved here?
I can see that there are situations where it is not possible to fix a broken a connection, but wonder if the current behavior is expected to be lived with?

For now I will try server_login_retry = 0 additionally, and see how it behaves.

Источник

приложением > Haproxy > Pgbouncer > Postgres. Кластер постгрес сформирован на основе Patroni.

Периодически приложение выдает ошибку «server conn crashed». В это время на pgbouncere в логах:

«pooler error: server conn crashed?»

на постгресе в логах:

FATAL: invalid frontend message type 32
ERROR: invalid message format

Данная ошибка наблюдается 1-2 раза в час.

Конфигурация пгбаунсера:

[databases]
postgres = host=127.0.0.1 port=5432 dbname=postgres
* = host=127.0.0.1 port=5432
[pgbouncer]
logfile = /var/log/pgbouncer/pgbouncer.log
pidfile = /var/run/pgbouncer/pgbouncer.pid
listen_addr = 10.0.0.32
listen_port = 6432
unix_socket_dir = /var/run/postgresql
auth_type = md5
auth_file = /etc/pgbouncer/userlist.txt
admin_users = postgres
ignore_startup_parameters = extra_float_digits,geqo
pool_mode = transaction
max_client_conn = 10000
default_pool_size = 80
min_pool_size = 20
pkt_buf = 8192
listen_backlog = 4096
log_connections = 0
log_disconnections = 0

Конекшин стринг на вебнодах:

«DefaultConnection»: «Server=10.0.0.100;Port=5432;Database=;User Id=_;Password=_;Minimum Pool Size=5;Maximum Pool Size=100;»

russian

metrics

database


4

ответов

Точно такого не было, но попробуйте Maximum Pool Size поднять до 500


Alekh0

Точно такого не было, но попробуйте Maximum Pool S…

пробовал ставить 400, результат тотже( когда без хапрокси, то ошибок меньше на день, но все равно есть.


Volodymyr Victorovich

пробовал ставить 400, результат тотже( когда без …

хм, тогда точно надо в haproxy timeout’ы поднять, т.к. она балансирует БД


Alekh0

хм, тогда точно надо в haproxy timeout’ы поднять, …

сейчас такой конфиг. учитывая, что они в одной локальной сети разве 15 сек может быть мало?

global
maxconn 100000
log /dev/log local0
log /dev/log local1 notice
chroot /var/lib/haproxy
stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
stats timeout 30s
user haproxy
group haproxy
daemon

defaults
mode tcp
log global
retries 2
timeout queue 15s
timeout connect 15s
timeout client 60m
timeout server 60m
timeout check 20s

Источник

Puneet Arora

@puneetarora_07_twitter

Here is the config we have for pgBouncer: 

pool_mode = transaction
max_client_conn = 5000
min_pool_size = 10

# Fail fast for initial connection issues 
# (seconds)
client_login_timeout = 5
server_connect_timeout = 5

# Max time a query can wait in backlog before being executed by server. If the query isn't
# assigned to a server during this time, the client is disconnected
# (seconds)
query_wait_timeout = 10

# The pooler will close an unused server connection that has been connected longer than this
# (seconds)
server_lifetime = 60

# Kill idle connections early
# (seconds)
server_idle_timeout = 60

# Increase size of request queue backlog
listen_backlog = 4096

# Disable noisy logging
log_connections = 0
log_disconnections = 0

# The same as tcp_retries2 but at the socket level
# (milliseconds)
tcp_user_timeout = 12500

# Keep alive settings combined with the above will mean dud connections are killed at 12.5s,
# after the 3rd keep alive probe is sent (https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/)
# (seconds)
tcp_keepalive = 1
tcp_keepidle = 1
tcp_keepintvl = 11
tcp_keepcnt = 3

# Log stats more frequently
# (seconds)
stats_period = 30

DURGA PRASAD REDDY

@patlolladurgaprasad8_gitlab

Hi every one !!!

I have established pgbouncer-rr for redshift. I used docker to generate image of pgbouncer-rr and run the container with that image in AWS ECS, and my container is attached with a load balancer which listen on PORT 6432 and forwards request directly to pgbouncer container. Service is running fine without any error but when i’m trying to connect to redshift through pgbouncer-rr using loadbalancer DNS, it’s throwing me «(Jdbc)(11380)Null Pointer Exception» in SQLworkbench

[databases]
* = host=analytics-XXX.XXXXX.us-west-2.redshift.amazonaws.com port=5439 dbname=gravtyrs auth_user=gravty password=ABC
[pgbouncer]
logfile = /var/log/postgresql/pgbouncer.log
pidfile = /var/run/postgresql/pgbouncer.pid
;listen_addr = *
listen_addr = 0.0.0.0
listen_port = 6432
unix_socket_dir = /var/run/postgresql
auth_type = trust
admin_users = gravty
auth_file = /etc/pgbouncer/userlist.txt
pool_mode = session
server_reset_query = DISCARD ALL
max_client_conn = 1000
default_pool_size = 20
ignore_startup_parameters = extra_float_digits
server_idle_timeout = 60

and my userlist.txt container username as gravty along with my password
My DockerFIle is https://gitlab.com/qixtand/dockerhub/blob/master/debian/jessie/pgbouncer-rr/1.7.2/Dockerfile

I know your time is super valuable please help me in solving this issue

@puneetarora_07_twitter You don’t show what you have set for pool_size. What are you basing your «20% of the pool» on?

@patlolladurgaprasad8_gitlab If you are getting Java exceptions in SQLworkbench, then you need to look there. PgBouncer doesn’t cause Java exceptions.

@petere, I work with @puneetarora_07_twitter and we have pool sizes per database (3 databases).

the average pool_size per DB is around 30

It doesn’t look like we’re exhausting the pools so we’re wondering what else could be causing the client_login_timeout

I have 2 pools, a write pool and a query pool. If the write pool and its reserve get full, my understanding is that PGBouncer keeps listen_backlog number of pending connections in a queue. If listen_backlog reaches the limit, does that mean connections for both the write and query pools are dropped?

1 reply

Hi all, I’m curious about a statement on the pgbouncer FAQ: upgrading pgbouncer w/o dropping cxns, it says: «This cannot be done with TLS connections.»

Does anyone know if there is a fundamental problem with doing this, or is it a matter of work that hasn’t been done (presumably it’s not trivial :) )?

1 reply

Hey @jschaf, I think the listen_backlog works in conjunction with query_wait_timeout. If a query is in the backlog for longer than the query_wait_timeout, it will get dropped at that point

DURGA PRASAD REDDY

@patlolladurgaprasad8_gitlab

Hi all,
I’m using pgbouncer-rr to connect Redshift, but during connection, I come across some issue it’s giving me
2020-05-13 16:16:24.577 1 WARNING lookup failed: port=: result=-2
2020-05-13 16:16:24.577 1 LOG S-0x9db890: gravtyrs/bol@(bad-af):0 closing because: server dns lookup failed (age=0)

I have created empty pgbouncer.ini and userlist.txt and passing the configurations from entrypoint.sh file

my entrypoint.sh file 

#!/bin/bash
set -e


PG_PORT_5439_TCP_ADDR=${PG_PORT_5432_TCP_ADDR:-}
PG_PORT_5439_TCP_PORT=${PG_PORT_5432_TCP_PORT:-}
PG_ENV_POSTGRESQL_USER=${PG_ENV_POSTGRESQL_USER:-}
PG_ENV_POSTGRESQL_PASS=${PG_ENV_POSTGRESQL_PASS:-}
PG_ENV_POSTGRESQL_POOL_MODE=${PG_ENV_POSTGRESQL_POOL_MODE:-}
PG_ENV_POSTGRESQL_DB_NAME=${PG_ENV_POSTGRESQL_DB_NAME:-}
PG_ENV_POSTGRESQL_MAX_CLIENT_CONN=${PG_ENV_POSTGRESQL_MAX_CLIENT_CONN:-}
PG_ENV_POSTGRESQL_DEFAULT_POOL_SIZE=${PG_ENV_POSTGRESQL_DEFAULT_POOL_SIZE:-}
PG_LOG=/var/log/postgresql/
PG_USER=postgres
PG_GROUP=postgres
PG_CONFIG_DIR=/etc/pgbouncer
PG_CONFIG=pgbouncer.ini
PG_USERS=userlist.txt




if [ -f /etc/pgbouncer/pgbouncer.ini ]
then
cat << EOF > /etc/pgbouncer/pgbouncer.ini
[databases]
* = host=${PG_PORT_5439_TCP_ADDR} port=${PG_PORT_5439_TCP_PORT} dbname=${PG_ENV_POSTGRESQL_DB_NAME} auth_user=${PG_ENV_POSTGRESQL_USER} password=${PG_ENV_POSTGRESQL_PASS}

[pgbouncer]
logfile = /var/log/postgresql/pgbouncer.log
pidfile = /var/run/postgresql/pgbouncer.pid
;listen_addr = *
listen_addr = 0.0.0.0
listen_port = 6432
unix_socket_dir = /var/run/postgresql
auth_type = trust
admin_users = ${PG_ENV_POSTGRESQL_USER}
auth_file = /etc/pgbouncer/userlist.txt
pool_mode = ${PG_ENV_POSTGRESQL_POOL_MODE}
server_reset_query = DISCARD ALL
max_client_conn = ${PG_ENV_POSTGRESQL_MAX_CLIENT_CONN}
default_pool_size = ${PG_ENV_POSTGRESQL_DEFAULT_POOL_SIZE}
ignore_startup_parameters = extra_float_digits
server_idle_timeout = 60

EOF
fi
if [ -f /etc/pgbouncer/userlist.txt ]
then
        echo '"'"${PG_ENV_POSTGRESQL_USER}"'" "'"${PG_ENV_POSTGRESQL_PASS}"'"'  > /etc/pgbouncer/userlist.txt
fi

mkdir -p ${PG_LOG}
chmod -R 0755 ${PG_LOG}
chown -R ${PG_USER}:${PG_GROUP} ${PG_LOG}
chmod 0640 ${PG_CONFIG_DIR}/${PG_CONFIG} ${PG_CONFIG_DIR}/${PG_USERS}
chown ${PG_USER}:${PG_GROUP} ${PG_CONFIG_DIR}/${PG_CONFIG} ${PG_CONFIG_DIR}/${PG_USERS}

echo "Starting pgbouncer"
exec pgbouncer -u ${PG_USER} ${PG_CONFIG_DIR}/${PG_CONFIG}

blbrblbr

@blbrblbr1_twitter

I don’t understand pgbouncer logs. For example, when it’s printing «LOG stats: 548 xacts/s, 548 queries/s, in 125426 B/s, out 183366 B/s, xact 714 us, query 714 us, wait 23 us», I don’t believe that the average query time is 714 microseconds — explain analyze select 1; requested over a unix socket yields 0.036 ms total, which is 36 microseconds. What am I missing?

2 replies

@patlolladurgaprasad8_gitlab did you find a solution to the «bad-af» server dns lookup failed? i have hit similar when deploying a pgbouncer v1.9 container. I had pgbouncer v1.8 container before that worked fine. after getting the bad-af server dns error, i even tried going back to the previous version but get the same bad-af error now.

hi, We are in the process of building poc to work with pgbouncer pools. Our deployment scenario includes a network load balancer that forwards requests to a group of ec2 instances that are auto scaled and each ec2 runs pgbouncer. I understand that the pgbouncer stats are available only on the local ec2 instance through psql where pgbouncer runs. These stats are available through the virtual pgbouncer database. There are pgbouncer fdw installs such as https://github.com/CrunchyData/pgbouncer_fdw to push the stats to a database table. Question is — what is the best possible way to gather aggregate statistics from all pgbouncer instances. This aggregate can be postgres db or cloudwatch.

3 replies

Also, from the aggregate stats we would want to identify ec2 instances/pgbouncers feeding those stats

John Carlyle-Clarke

@VSpike

My assumption is that using SET application_name from the client in transaction pooling mode is basically useless, unless PGBouncer does some magic that re-sends it every time a connection is assigned to client, and I don’t think it does that.

1 reply

I’m also wondering if the application_name_add_host setting could even work in transaction pooling mode. Sounds like something that would only work in session pooling mode … again, unless PGBouncer re-sets it every time a backend connection is attached to a client

Seems to me like the only useful thing would be to set the application name by each entry in [databases]so you at least know which virtual DB a query is coming from

Am I about right on this?

hi, I’m new to pgbouncer and am confused by the difference between avg_wait_time and maxwait,
I’m seeing spikes of up to 1728043 for avg_wait_time, but I never see anything but 0’s for maxwait and maxwait_us

2 replies

and even spikes to 201379868 for avg_wait_time

Does pgbouncer support escapeSyntaxCallMode property of jdbc driver when connecting from a java client to pgbouncer?

2 replies

Edward Middleton

@E14n_twitter

Is there a way to configure pgbouncer to completely disconnects from a backend database when client connections are idle? I have an application that rarely accesses the database and I am trying to get the database to hibernate and restore using AWS Serverless and AutoPause, but the persistent pgbouncer connection is stopping it from hibernating.

6 replies

Mathieu Charton

@MathCharton

Hello
I’m looking for someone who knows pg_bouncer well.
I have errors on RDS instance :
FATAL: 57P01: terminating connection due to administrator command
and errors on pg_bouncer :
WARNING C-0x………: bdd_tes/….@10.2.5.555:66666 pooler error: server conn crashed?
Do you have any explanation for my problem ?
Thanks

1 reply

Hi folks, I have a question related to handling of server connections by pgbouncer in transaction mode, Looking through the source I see that pgbouncer releases server connections https://github.com/pgbouncer/pgbouncer/blob/ad6b5af4e27c8e9059b7a1e7dd541ea3b7c72624/src/server.c#L554 on receiving SBUF_EV_FLUSH event from postgres db. When is this event sent by postgres ? What is the scenario? Is this event sent by postgres after a commit is issued by a client? I need this information to justify the throughput gains of pgbouncer to my client

3 replies

i’m getting this when trying to run pgbouncer -V, how do I fix it? «pgbouncer: error while loading shared libraries: libevent-2.1.so.7: cannot open shared object file: No such file or directory»

1 reply

my system did an auto-upgrade from 1.8.x to 1.13 this morning. afterwards the systemd unit stopped being able to start bouncer

i could start it manually using -d and whatnot

downgrading the package to 1.8 fixed the issue

one thing i noticed is that the newer execstart command did not include the -d switch

ExecStart=/usr/bin/pgbouncer -q ${BOUNCERCONF}

the old one was ExecStart=/usr/bin/pgbouncer -d -q ${BOUNCERCONF}

when i started version 1.13 manually i used the -d switch

all efforts to determine why it wasn’t starting failed

nothing helpful in the journal or its own log etc.

pgbouncer 1.13 supports Type=notify service units. I suspect one thing that could have happened is that you have a service unit written that way but pgbouncer was not compiled with systemd support. What package are you using, what’s your OS, what is the full content of the service unit file?

i think it’s 7.4 but anyway, it updates automatically

the unit was switched in the package from type=forked to notify

i manually tried every option in the unit that i could, including all other types, and none of them would start

i even tried adding the -d switch, and that didn’t work. i think the problem is somehow bouncer is not reporting to systemd that it has started

i also tried troubleshooting on a centos 7 server, and i could not get this same package to start, ie. it had all the same problems as the rhel7 server

i think if you look at the spec file, systemd support was compiled

maybe i’m using an unstable package that is not really intended for prod

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