Re: [GENERAL] GMT FATAL: remaining connection slots are reserved fornon-replication superuser connections, but I'm using pgBouncer for connectionpooling

On 02/25/2017 04:19 AM, lisandro wrote:
> Hi there! Please tell me if this isn't the place to post my question, I'm new
> in the list.
>
> I'm using PostgreSQL 9.3, I have around 150 databases, and I use pgBouncer
> for connection pooling.
> My server is a VPS with 8cpus and 24gb of RAM.
>
> My current postgreSQL configuration (resumed) is this:
>
> listen_addresses = '*'
> port = 6543
> max_connections = 250
> shared_buffers = 2GB
> effective_cache_size = 6GB
> work_mem = 10485kB
> maintenance_work_mem = 512MB
> checkpoint_segments = 32
> checkpoint_completion_target = 0.7
> wal_buffers = 16MB
> default_statistics_target = 100

What is superuser_reserved_connections set to?

>
>
> In the other hand, my pgBouncer configuration (resumed) is this:
>
> listen_addr = localhost
> listen_port = 5432
> pool_mode = transaction
> server_reset_query = DISCARD ALL
> max_client_conn = 10000
> default_pool_size = 10
> min_pool_size = 2
> server_idle_timeout = 30
>
>
> However, for the last couple of months (total db number has been increasing)
> I have these sporadic errors where pgbouncer can't connect to postgresql.
> They occurr every day with variable frequency. Every time the error appears,
> it does in a different database. Even in those where the activity is almost
> none.
>
> Every time the error is triggered, I check the total connections number and
> it never goes beyond ~130.
> This is how I check, from psql:
> select count(*) from pg_stat_activity;
>
> Also I check for inactive connections with this:
> select count(*) from pg_stat_activity where (state = 'idle in transaction')
> and xact_start is not null;
> ... but this number is always low, ~8 idle connections.
>
>
>
> When the error triggers, I check the postgresql log and I see this:
>
> 2017-02-25 09:13:31 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:31 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:31 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:46 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:46 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:46 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:47 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:48 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
> 2017-02-25 09:13:49 GMT FATAL:  remaining connection slots are reserved for
> non-replication superuser connections
>
>
>
> And if I check the pgbouncer log I see this:
>
> 2017-02-25 09:12:37.354 4080 LOG Stats: 24 req/s, in 387979 b/s, out 2657772
> b/s,query 146363 us
> 2017-02-25 09:13:37.355 4080 LOG Stats: 23 req/s, in 382191 b/s, out 2594329
> b/s,query 144827 us
> 2017-02-25 09:14:29.687 4080 ERROR S: login failed: FATAL: remaining
> connection slots are reserved for non-replication superuser connections
> 2017-02-25 09:14:37.355 4080 LOG Stats: 28 req/s, in 383614 b/s, out 2596947
> b/s,query 124098 us
> 2017-02-25 09:14:44.985 4080 ERROR S: login failed: FATAL: remaining
> connection slots are reserved for non-replication superuser connections
> 2017-02-25 09:14:46.290 4080 ERROR S: login failed: FATAL: remaining
> connection slots are reserved for non-replication superuser connections
> 2017-02-25 09:15:37.355 4080 LOG Stats: 26 req/s, in 378113 b/s, out 2717657
> b/s,query 164167 us
>
>
> What am I missing? I will appreciate any tip or suggestion.
> Thanks in advance!
>
>
>
> --
> View this message in context:
http://www.postgresql-archive.org/GMT-FATAL-remaining-connection-slots-are-reserved-for-non-replication-superuser-connections-but-I-m-g-tp5946245.html
> Sent from the PostgreSQL - general mailing list archive at Nabble.com.
>
>


--
Adrian Klaver
adrian.klaver@aklaver.com