annotate roundup/anypy/xmlrpc_.py @ 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 99d4fb22aa65
children 7b33365ccb2a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5408
e46ce04d5bbc Python 3 preparation: update xmlrpclib / SimpleXMLRPCServer imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
diff changeset
1 try:
e46ce04d5bbc Python 3 preparation: update xmlrpclib / SimpleXMLRPCServer imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
diff changeset
2 # Python 3+.
e46ce04d5bbc Python 3 preparation: update xmlrpclib / SimpleXMLRPCServer imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
diff changeset
3 from xmlrpc import client, server
5552
db10c0a1f338 Fix xmlrpc module selection for incomplete backport (issue2551010).
Gabi <gabriele.roeger@unibas.ch>
parents: 5408
diff changeset
4 server.SimpleXMLRPCDispatcher
db10c0a1f338 Fix xmlrpc module selection for incomplete backport (issue2551010).
Gabi <gabriele.roeger@unibas.ch>
parents: 5408
diff changeset
5 except (ImportError, AttributeError):
5408
e46ce04d5bbc Python 3 preparation: update xmlrpclib / SimpleXMLRPCServer imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
diff changeset
6 # Python 2.
6049
99d4fb22aa65 flake8 fixes: ignore import unused in python3.
John Rouillard <rouilj@ieee.org>
parents: 5552
diff changeset
7 import xmlrpclib as client # noqa: F401
5408
e46ce04d5bbc Python 3 preparation: update xmlrpclib / SimpleXMLRPCServer imports.
Joseph Myers <jsm@polyomino.org.uk>
parents:
diff changeset
8 import SimpleXMLRPCServer as server

Roundup Issue Tracker: http://roundup-tracker.org/