Mercurial > p > roundup > code
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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 | ae670ab2dd55 |
| children | f3a0cb617ea8 |
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# check syntax using: # https://config.travis-ci.com/explore os: linux language: python cache: pip #I would like to build and test the maint-1.6 and trunk/default #but we need different environments for these: # maint-1.6 only python 2, install only psycopg2 version with support for # psycopg1 branches: # only: # - default # - maint-1.6 dist: - bionic # - pypy3 python: - 2.7 - 3.10.0 - 3.9 - 3.8 - 3.6 - nightly services: - mysql - postgresql jobs: allow_failures: # nightly not ready for prime time yet. - python: 3.10 - python: nightly - python: pypy3 addons: apt: sources: - sourceline: ppa:xapian-backports/ppa packages: # Required to build/install the xapian-binding - libxapian-dev # Required to install gpg - swig # Required to build gpgme. - gpgsm before_install: # Sphinx required to build the xapian python bindings - pip install sphinx==1.8.5 - XAPIAN_VER=$(dpkg -l libxapian-dev | tail -n 1 | awk '{print $3}' | cut -d '-' -f 1) - cd /tmp - curl -s -O https://oligarchy.co.uk/xapian/$XAPIAN_VER/xapian-bindings-$XAPIAN_VER.tar.xz - tar -Jxvf xapian-bindings-$XAPIAN_VER.tar.xz - cd xapian-bindings-$XAPIAN_VER/ - echo $TRAVIS_PYTHON_VERSION - if [[ $TRAVIS_PYTHON_VERSION == "2."* ]]; then ./configure --prefix=$VIRTUAL_ENV --with-python; fi - if [[ $TRAVIS_PYTHON_VERSION == "3."* ]]; then ./configure --prefix=$VIRTUAL_ENV --with-python3; fi - if [[ $TRAVIS_PYTHON_VERSION == "nightly" ]]; then ./configure --prefix=$VIRTUAL_ENV --with-python3; fi - if [[ $TRAVIS_PYTHON_VERSION == "pypy3" ]]; then ./configure --prefix=$VIRTUAL_ENV --with-python3; fi - make && make install - PATH=$VIRTUAL_ENV/bin:$PATH # libgpg-error - LIBGPG_ERROR_VERSION=1.43 - cd /tmp - curl -s -O https://www.gnupg.org/ftp/gcrypt/libgpg-error/libgpg-error-$LIBGPG_ERROR_VERSION.tar.bz2 - tar -jxvf libgpg-error-$LIBGPG_ERROR_VERSION.tar.bz2 - cd libgpg-error-$LIBGPG_ERROR_VERSION - ./configure --prefix=$VIRTUAL_ENV - make && make install # libassuan - LIBASSUAN_VERSION=2.5.5 - cd /tmp - curl -s -O https://www.gnupg.org/ftp/gcrypt/libassuan/libassuan-$LIBASSUAN_VERSION.tar.bz2 - tar -jxvf libassuan-$LIBASSUAN_VERSION.tar.bz2 - cd libassuan-$LIBASSUAN_VERSION - ./configure --prefix=$VIRTUAL_ENV - make && make install # gpgme - GPGME_VERSION=1.16.0 - cd /tmp - curl -s -O https://www.gnupg.org/ftp/gcrypt/gpgme/gpgme-$GPGME_VERSION.tar.bz2 - tar -jxf gpgme-$GPGME_VERSION.tar.bz2 - cd gpgme-$GPGME_VERSION - ./configure --prefix=$VIRTUAL_ENV - make && make install # change back to the checked out repository directory - cd $TRAVIS_BUILD_DIR install: - if [[ $TRAVIS_PYTHON_VERSION == "3.4"* ]]; then pip install mysqlclient==1.3.14; fi - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* ]]; then pip install mysqlclient; fi - pip install psycopg2 - pip install gpg pytz whoosh pyjwt requests - pip install pytest-cov codecov - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* ]]; then pip install docutils; fi - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* ]]; then pip install mistune; fi - if [[ $TRAVIS_PYTHON_VERSION != "3.4"* && $TRAVIS_PYTHON_VERSION != "2."* ]]; then pip install Markdown; fi - pip install markdown2 - pip install brotli zstd before_script: # set up mysql database - sudo sed -i -e '/^\[mysqld\]/,/^\[mysql/s/^max_allowed_packet.*/max_allowed_packet = 500M/' /etc/mysql/my.cnf - cat /etc/mysql/my.cnf - sudo service mysql restart - mysql -u root -e 'GRANT ALL ON rounduptest.* TO rounduptest@localhost IDENTIFIED BY "rounduptest";' - sudo service postgresql restart; sleep 30 # set up postgresql database - psql -c "CREATE ROLE rounduptest WITH CREATEDB LOGIN PASSWORD 'rounduptest';" -U postgres # HACK: workaround mysql bug: http://bugs.mysql.com/bug.php?id=74901 # needed for test_mysql.mysqlDBTest.testFilteringSpecialChars - sed -i 's/CREATE DATABASE \%s/CREATE DATABASE \%s COLLATE utf8_general_ci/' roundup/backends/back_mysql.py # build the .mo translation files and install them into a tree # (locale/locale under roundup directory root) # suitable for use by gettext. - (cd locale; make local_install; ls -lR locale/de/LC_MESSAGES) script: - PATH=$VIRTUAL_ENV/bin:$PATH - export LD_LIBRARY_PATH=$VIRTUAL_ENV/lib:$LD_LIBRARY_PATH - if [[ "$TRAVIS_PYTHON_VERSION" != "2."* ]]; then py.test -W default -W "ignore:SelectableGroups:DeprecationWarning" -W "ignore:the imp module:DeprecationWarning:gpg.gpgme:15" -W "ignore:'U' mode::docutils.io" -W "ignore:unclosed:ResourceWarning:roundup.roundup.demo" -W "ignore:unclosed file:ResourceWarning:enum" -v --maxfail=20 test/ --cov=roundup; fi - if [[ "$TRAVIS_PYTHON_VERSION" == "2."* ]]; then py.test -v --maxfail=20 test/ --cov=roundup; fi after_success: - codecov
