Mercurial > p > roundup > code
annotate test/test_instance.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> |
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| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | 778a9f455067 |
| children | 9c3ec0a5c7fc |
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1 # |
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2 # Copyright (C) 2020 John Rouillard |
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3 # All rights reserved. |
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4 # For license terms see the file COPYING.txt. |
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5 # |
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6 |
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7 from __future__ import print_function |
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8 import unittest, os, shutil, errno, sys, difflib |
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9 |
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10 from roundup import instance |
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11 from roundup.instance import TrackerError |
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12 |
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13 try: |
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14 # python2 |
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15 import pathlib2 as pathlib |
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16 except ImportError: |
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17 # python3 |
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18 import pathlib |
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20 from . import db_test_base |
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21 |
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22 class InstanceTest(unittest.TestCase): |
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23 |
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24 backend = 'anydbm' |
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25 |
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26 def setUp(self): |
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27 self.dirname = '_test_instance' |
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28 # set up and open a tracker |
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29 self.instance = db_test_base.setupTracker(self.dirname, self.backend) |
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31 # open the database |
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32 self.db = self.instance.open('admin') |
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33 |
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34 self.db.commit() |
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35 self.db.close() |
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36 |
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37 def tearDown(self): |
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38 if self.db: |
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39 self.db.close() |
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40 try: |
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41 shutil.rmtree(self.dirname) |
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42 except OSError as error: |
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43 if error.errno not in (errno.ENOENT, errno.ESRCH): raise |
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45 |
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46 def testOpenOldStyle(self): |
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47 pathlib.Path(os.path.join(self.dirname, "dbinit.py")).touch() |
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48 # no longer support old style tracker configs |
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49 self.assertRaises(TrackerError, instance.open, self.dirname) |
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50 |
