hikaricp - HikariPool-1 - 连接不可用(Camunda)

Question

从 camunda 7.8 升级到 7.9 后，我收到此 HikariPool-1 - 连接不可用，任何人都可以帮助我解决此问题吗？

Caused by: java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30000ms.
    at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:667)
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:183)
    at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148)
    at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:128)
    at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:262)

--

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30000ms.
    at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:305)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.handleExistingTransaction(AbstractPlatformTransactionManager.java:430)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:354)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:137)
    at org.camunda.bpm.engine.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:40)
    at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:66)
    at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)
    at org.camunda.bpm.engine.impl.db.DbIdGenerator.getNewBlock(DbIdGenerator.java:46)
    at org.camunda.bpm.engine.impl.db.DbIdGenerator.getNextId(DbIdGenerator.java:38)
    at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.ensureHasId(DbEntityManager.java:663)
    at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.insert(DbEntityManager.java:546)

Answer 1

我尝试增加池大小，看起来这个异常已经消失了。

spring:
    datasource:
        url: 'jdbc:mysql://localhost/db?useSSL=false'
        username: root
        password: pass
        driver: com.mysql.jdbc.Driver
        hikari:
            minIdle: 10
            idle-timeout: 10000
            maximumPoolSize: 30

这些是我们可以在 hikari 上进行的以下配置更改，请根据您的需要添加/更新。

autoCommit
connectionTimeout
idleTimeout
maxLifetime
connectionTestQuery
connectionInitSql
validationTimeout
maximumPoolSize
poolName
allowPoolSuspension
readOnly
transactionIsolation
leakDetectionThreshold