We are still experiencing the issue first reported with MDEV-20987, even with MariaDB 10.4.10. After MariaDB and/or the server is rebooted, we see errors like "Table 'relution.scheduler_task' doesn't exist in engine".

Steps for reproduction
Base installation

• Create new virtual machine
  • "CentOS 7.x / MariaDB 10.4.x"
  • Linux
  • Red Hat (64-bit)
  • 4096 MB base memory
  • 20 GB SSD
• Install CentOS
  • CentOS-7-x86_64-Minimal-1804.iso
  • Minimal Install
  • Automatic partitioning
  • Wired network
  • Create user during installation ("relution")
• Reboot

Post-Installation steps

• yum -y update
• lsb_release -a
  • LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
  • Distributor ID: CentOS
  • Description: CentOS Linux release 7.7.1908 (Core)
  • Release: 7.7.1908
  • Codename: Core
• Reboot

Install MariaDB

• Create /etc/yum.repos.d/MariaDB.repo

  # MariaDB 10.4 CentOS repository list - created 2019-12-05 10:15 UTC

  # http://downloads.mariadb.org/mariadb/repositories/

  [mariadb]

  name = MariaDB

  baseurl = http://yum.mariadb.org/10.4/centos7-amd64

  gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB

  gpgcheck=1

• yum -y install mariadb-server mariadb
• mariadb --version

  mariadb Ver 15.1 Distrib 10.4.10-MariaDB, for Linux (x86_64) using readline 5.1

Configure MariaDB for application

• Create /etc/my.cnf.d/relution.cnf

  [mysqld]

  collation-server=utf8mb4_general_ci

  character-set-server=utf8mb4

  max_allowed_packet=1G

  innodb_file_per_table=1

• systemctl start mariadb.service
• systemctl enable mariadb.service

Install application

• yum -y install java-1.8.0-openjdk wget unzip
• cd /opt
• wget http://repo.relution.io/package/latest/relution-package.zip
• unzip relution-package.zip
• chown -R relution:relution relution

Create initial database

• Create /opt/create_database.sh =>

  #!/bin/bash

  if [[ $# -ne 2 ]]; then

  echo "Usage: $0 <database> <password>"

  exit 1

  fi

  DATABASE=$1

  PASSWORD=$2

  mysql -u root <<EOF

  CREATE DATABASE $DATABASE CHARACTER SET 'utf8mb4' COLLATE 'utf8mb4_general_ci';

  CREATE USER 'relution'@'localhost' IDENTIFIED BY '$PASSWORD';

  GRANT ALL PRIVILEGES ON $DATABASE.* TO 'relution'@'localhost' IDENTIFIED BY '$PASSWORD';

  CREATE USER 'relution'@'%' IDENTIFIED BY '$PASSWORD';

  GRANT ALL PRIVILEGES ON $DATABASE.* TO 'relution'@'%' IDENTIFIED BY '$PASSWORD';

  FLUSH PRIVILEGES;

  EOF

• chmod +x create_database.sh
• ./create_database.sh relution password

Minimal application configuration

• Create /opt/relution/application.yml =>

  relution:

  server:

  externalURL: https://www.example.org

  database:

  type: mysql

  url: jdbc:mariadb://127.0.0.1:3306/relution?useServerPrepStmts=true

  username: relution

  password: password

Start application

• sudo -u relution ./bin/relution-foreground.sh
• Wait until database has been initialized
• "INFO 10033 [ main] vice.StandardLockService: Successfully released change log lock"
• Stop application (Ctrl+C)

You can now start and stop the application, the database is working as expected.

Restart MariaDB

• systemctl stop mariadb.service
• systemctl start mariadb.service

Attempt to start application again

• sudo -u relution ./bin/relution-foreground.sh
  ==> The database is now broken

2019-12-05 11:37:36.146 ERROR 10335 [        main] s.boot.SpringApplication: Application run failed []

java.sql.SQLException: Table 'relution.scheduler_task' doesn't exist in engine

Query is: SELECT t0.`uuid`, t1.`scheduler_task_uuid`, t0.`active`, t0.`clustered`, t0.`data`, t0.`description`, t0.`last_success_date`, t0.`name`, t0.`run_as_user`, t0.`schedulable_type`, t0.`schedulable_uuid`, t0.`version`, t1.`expression`, t1.`period_number`, t1.`period_type`, t1.`start` FROM `scheduler_task` t0, `scheduler_task_period` t1 WHERE (t1.`scheduler_task_uuid` = t0.`uuid`)

<…>

Wrapped by: org.eclipse.persistence.exceptions.DatabaseException: 

Internal Exception: java.sql.SQLSyntaxErrorException: (conn=18) Table 'relution.scheduler_task' doesn't exist in engine

Error Code: 1932