On Tuesday, March 27, 2018 at 2:07:28 AM UTC-3, Jeremy Evans wrote: > > On Monday, March 26, 2018 at 7:26:03 PM UTC-7, Juan M. Cuello wrote: >> >> I´m using postgres with around 4000 schemas. Each request is handled by a >> forked unicorn process. Each process uses a connection pool of just 1 >> connection (max_connections = 1). I use a pool of just 1 connection because >> i need to be sure the same connection will be used along the request (the >> first executed statement sets search_path to the schema that will be used >> for subsequent statements). >> >> At certain moments, new schemas are created in the database. When this >> happens, unicorn processes seem to hang and are then killed by the master >> unicorn process due to taking too long to process the request (>30 secs, >> which is the configured timeout). At the same time, I see postgres proceses >> consume a lot of DB server CPU. As unicorn processes are killed, db >> connections are closed. Then, new unicorn processes are created and new db >> connections established, DB CPU returns to normal levels and requests are >> processed as usual. >> >> I wonder if for some reason, due to the high amount of schemes, Sequel >> connection could be having troubles when new schemas are added to the >> database that cause the application being unable to keep using the only >> available db connection, causing the request to hang until it is eventually >> killed. >> > > It's hard to say what the problem actually is without a reproducible > example. I'm not sure why adding a schema would cause excessive query > time, but the issue may be more related to PostgreSQL than Sequel. > > I tried to reproduce the issue, using two different connections, one with Sequel and the other with ActiveRecord. Both produced the same results when a new schema was added to the DB, excessive query time.
It is clear now that the issue is not related to Sequel. Thanks -- You received this message because you are subscribed to the Google Groups "sequel-talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to sequel-talk+unsubscr...@googlegroups.com. To post to this group, send email to sequel-talk@googlegroups.com. Visit this group at https://groups.google.com/group/sequel-talk. For more options, visit https://groups.google.com/d/optout.
