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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 b85c01544cfe
children
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version: 2
jobs:
  ubuntu:
    docker:
      - image: circleci/buildpack-deps:20.04

      - image: circleci/postgres:12-alpine-ram
        environment:
          POSTGRES_USER: postgres
          POSTGRES_DB: circle_test

      - image: circleci/mysql:8.0-ram
        environment:
          MYSQL_ALLOW_EMPTY_PASSWORD=true
          MYSQL_ROOT_HOST=%

    resource_class: small

    working_directory: ~/repo

    steps:
      - checkout

      - run:
          name: install packages
          command: |
            sudo apt-get update
            sudo apt-get install -y libgpgme-dev default-mysql-client-core postgresql-client python3-docutils python3-gpg python3-jwt python3-markdown python3-markdown2 python3-mistune python3-mysqldb python3-pip python3-psycopg2 python3-pytest python3-pytest-cov python3-tz python3-venv python3-whoosh python3-xapian swig

      - run:
          name: setup databases
          command: |
            psql -d postgresql://postgres@localhost/circle_test -c "CREATE ROLE rounduptest WITH CREATEDB LOGIN PASSWORD 'rounduptest';"
            echo -e "[client]\nprotocol=tcp\n" >~/.my.cnf
            mysql --print-defaults
            mysql -u root -e "CREATE USER 'rounduptest'@'127.0.0.1' IDENTIFIED BY 'rounduptest'; GRANT ALL ON rounduptest.* TO 'rounduptest'@'127.0.0.1';"

      - run:
          name: run tests
          command: |
            py.test-3 -v test/ --cov=roundup --junitxml test-results/ubuntu.xml

      - run:
          name: run coverage
          command: |
            python3-coverage html -i

      - store_test_results:
          path: test-results

      - store_artifacts:
          path: htmlcov
          destination: roundup-ubuntu

  ubuntu-old:
    docker:
      - image: circleci/buildpack-deps:18.04

      - image: circleci/postgres:10-alpine-ram
        environment:
          POSTGRES_USER: postgres
          POSTGRES_DB: circle_test

      - image: circleci/mysql:5.7-ram
        environment:
          MYSQL_ALLOW_EMPTY_PASSWORD=true
          MYSQL_ROOT_HOST=%

    resource_class: small

    working_directory: ~/repo

    steps:
      - checkout

      - run:
          name: install packages
          command: |
            sudo apt-get update
            sudo apt-get install -y libgpgme-dev default-mysql-client-core postgresql-client python3-docutils python3-gpg python3-jwt python3-markdown python3-mistune python3-mysqldb python3-pip python3-psycopg2 python3-pytest python3-pytest-cov python3-tz python3-venv python3-whoosh python3-xapian swig

      - run:
          name: setup databases
          command: |
            psql -d postgresql://postgres@localhost/circle_test -c "CREATE ROLE rounduptest WITH CREATEDB LOGIN PASSWORD 'rounduptest';"
            echo -e "[client]\nprotocol=tcp\n" >~/.my.cnf
            mysql --print-defaults
            mysql -u root -e "CREATE USER 'rounduptest'@'127.0.0.1' IDENTIFIED BY 'rounduptest'; GRANT ALL ON rounduptest.* TO 'rounduptest'@'127.0.0.1';"

      - run:
          name: run tests
          command: |
            py.test-3 -v test/ --cov=roundup --junitxml test-results/ubuntu-old.xml

      - run:
          name: run coverage
          command: |
            python3-coverage html -i

      - store_test_results:
          path: test-results

      - store_artifacts:
          path: htmlcov
          destination: roundup-ubuntu-old

  debian:
    docker:
      - image: circleci/buildpack-deps:buster

      - image: circleci/postgres:11-alpine-ram
        environment:
          POSTGRES_USER: postgres
          POSTGRES_DB: circle_test

      - image: circleci/mariadb:10.3-ram
        environment:
          MYSQL_ALLOW_EMPTY_PASSWORD=true
          MYSQL_ROOT_HOST=%

    resource_class: small

    working_directory: ~/repo

    steps:
      - checkout

      - run:
          name: install packages
          command: |
            sudo apt-get update
            sudo apt-get install -y libgpgme-dev default-mysql-client-core postgresql-client python3-docutils python3-gpg python3-jwt python3-markdown python3-markdown2 python3-mistune python3-mysqldb python3-pip python3-psycopg2 python3-pytest python3-pytest-cov python3-tz python3-venv python3-whoosh python3-xapian swig

      - run:
          name: setup databases
          command: |
            psql -d postgresql://postgres@localhost/circle_test -c "CREATE ROLE rounduptest WITH CREATEDB LOGIN PASSWORD 'rounduptest';"
            echo -e "[client]\nprotocol=tcp\nhost=127.0.0.1\n" >~/.my.cnf
            mysql --print-defaults
            mysql -u root -e "CREATE USER 'rounduptest'@'127.0.0.1' IDENTIFIED BY 'rounduptest'; GRANT ALL ON rounduptest.* TO 'rounduptest'@'127.0.0.1';"
            # patch host to 127.0.0.1 to force TCP connection to MySQL
            sed -i -e 's/\(config[.]RDBMS_HOST =\) "localhost"/\1 "127.0.0.1"/' test/db_test_base.py
            sed -i -e 's/rdbms_name=\([^,]\+\),/rdbms_host=127.0.0.1,rdbms_name=\1,/' test/test_admin.py

      - run:
          name: run tests
          command: |
            py.test-3 -v test/ --cov=roundup --junitxml test-results/debian.xml

      - run:
          name: run coverage
          command: |
            python3-coverage html -i

      - store_test_results:
          path: test-results

      - store_artifacts:
          path: htmlcov
          destination: roundup-debian

workflows:
  version: 2
  test_all:
    jobs:
      - ubuntu
      - ubuntu-old
      - debian
Roundup Issue Tracker: http://roundup-tracker.org/