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view doc/postgresql.txt @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | ba82fb74f806 |
| children | a0a100453eb9 |
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.. index:: postgres; deployment notes ========================== PostgreSQL/psycopg Backend ========================== This are notes about PostqreSQL backend based on the psycopg adapter for Roundup issue tracker. Prerequisites ============= To use PostgreSQL as backend for storing roundup data, you should additionally install: 1. PostgreSQL 8.x or higher - https://www.postgresql.org/ 2. The psycopg python interface to PostgreSQL: https://www.psycopg.org/ Running the PostgreSQL unit tests ================================= The user that you're running the tests as will need to be able to access the postgresql database on the local machine and create and drop databases. See the config values in 'test/db_test_base.py' about which database connection, name and user will be used. Credit ====== The postgresql backend was originally submitted by Federico Di Gregorio <fog@initd.org>