ENV:
Linux: Red Hat 7.5 (Maipo)
MariaDB: 10.2.13-MariaDB
Keycloak: 3.4.3.Fina
JDBC driver: mariadb-java-client-2.2.5.jar
Decription:
I start a keycloak instance , make it to connect to a galera-cluster.
while :
If I use “kill -9 mariaDB process” on a gelera node, the connection between keycloak and galera will occurred 500 error, after few seconds, 200 OK go on.
If I use “kill -15 mariaDB process” on a gelera node, the connection between keycloak and galera will 200 OK go on, no error happened.
"kill -9" to simulate the crash scenario for mysql service.
what I hope is that no any error when mysql service crashed. (e.g kill -9), keycloak should auto connect to next galera node when current node is crashed , without any errors
Below is my datasource configuration in standalone.xml
<datasource jndi-name="java:jboss/datasources/KeycloakDS" pool-name="KeycloakDS" enabled="true" use-java-context="true">
<connection-url>jdbc:mariadb:failover://db1,db2,db3/keycloak?autoReconnect=true&</connection-url>
<driver>mariadb</driver>
<security>
<user-name>kc_dbuser</user-name>
<password>7a092075c015090fe21c83ecd6f6</password>
</security>
<pool>
<min-pool-size>5</min-pool-size>
<max-pool-size>20</max-pool-size>
<flush-strategy>IdleConnections</flush-strategy>
</pool>
<validation>
<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker"/>
<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLExceptionSorter"/>
<check-valid-connection-sql>SELECT 1</check-valid-connection-sql>
<validate-on-match>true</validate-on-match>
<background-validation>true</background-validation>
<background-validation-millis>1000</background-validation-millis>
<use-fast-fail>true</use-fast-fail>
</validation>
<statement>
<share-prepared-statements>false</share-prepared-statements>
</statement>
</datasource>
is a keycloak bug or JBOSS bug or JDBC driver BUG or just configuration problem ? How to resolve it?
