annotate test/test_memorydb.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 7f00fc5958ca
children 044dcf3608a2
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1 import unittest, os, shutil, time
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3 from roundup import hyperdb
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4
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5 from .db_test_base import DBTest, ROTest, SchemaTest, config, setupSchema
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6 from roundup.test import memorydb
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8 class memorydbOpener:
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9 module = memorydb
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11 def nuke_database(self):
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12 # really kill it
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13 memorydb.db_nuke('')
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14 self.db = None
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16 db = None
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17 def open_database(self, user='admin'):
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18 if self.db:
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19 self.db.close()
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20 self.db = self.module.Database(config, user)
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21 return self.db
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22
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23 def setUp(self):
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24 self.open_database()
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25 setupSchema(self.db, 1, self.module)
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27 def tearDown(self):
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28 if self.db is not None:
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29 self.db.close()
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30 self.db = None
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31 self.nuke_database()
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33 # nuke and re-create db for restore
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34 def nukeAndCreate(self):
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35 self.db.close()
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36 self.nuke_database()
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37 self.db = self.module.Database(config, 'admin')
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38 setupSchema(self.db, 0, self.module)
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41 class memorydbDBTest(memorydbOpener, DBTest, unittest.TestCase):
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42 pass
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45 class memorydbROTest(memorydbOpener, ROTest, unittest.TestCase):
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46 def setUp(self):
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47 self.db = self.module.Database(config)
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48 setupSchema(self.db, 0, self.module)
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51 class memorydbSchemaTest(memorydbOpener, SchemaTest, unittest.TestCase):
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52 pass
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55 from .session_common import SessionTest
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56 class memorydbSessionTest(memorydbOpener, SessionTest, unittest.TestCase):
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57 def setUp(self):
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58 self.db = self.module.Database(config, 'admin')
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59 setupSchema(self.db, 1, self.module)
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60 self.sessions = self.db.sessions
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62 # vim: set filetype=python ts=4 sw=4 et si
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63

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