我试图为Hikari的Grails 2.5.4应用程序切换池，发现与默认的Tomcat jdbc相比，它的性能提升了很大！
然而，在运行某些集成测试时，我偶然发现了一个问题。这是现在失败的测试方法：
def 'Returns the bar with the least foo'() { given:
def foobar = Foobar.build()
and:
def bar1 = Bar.build(foo: 25, foobar: foobar)
def item1 = BarItem.build(state: AVAILABLE)
item1.addToBars(bar1)
and:
def bar2 = Bar.build(foo: 12, foobar: foobar)
def item2 = BarItem.build(state: AVAILABLE)
item2.addToBars(bar2)
when:
def bestBar = foobar.getBestBar()
then:
bestBar.id == bar2.id
when:
item2.state = State.BLACKED_OUT
item2.save(flush: true)
def refreshedFoobar
Foobar.withNewSession {
refreshedFoobar = Foobar.get(foobar.id) //This is returning null
}
and:
bestBar = refreshedFoobar.getBestBar() //null pointer exception here
then:
bestBar.id == bar1.id
}
为什么会这样？似乎事情没有被正确地推入数据库，就像它只是把它们放在会话中等待稍后发送它们一样。
这是我的Hikari配置：
def hp = new Properties()
hp.username = ds.username
hp.password = ds.password
hp.connectionTimeout = ds.maxWait
hp.maximumPoolSize = ds.maxActive
hp.minimumIdle = ds.minIdle
hp.jdbcUrl = ds.url
hp.driverClassName = ds.driverClassName
HikariConfig hc = new HikariConfig(hp)
hc.with{
addDataSourceProperty("prepStmtCacheSize", 500)
addDataSourceProperty("prepStmtCacheSqlLimit", 2048)
addDataSourceProperty("cachePrepStmts", true)
addDataSourceProperty("useServerPrepStmts", true)
}
值为
dialect = org.hibernate.dialect.MySQL5InnoDBDialect
driverClassName = 'com.mysql.jdbc.Driver'
username = 'user'
password = 'pass'
maxActive = 250
minIdle = 5
maxWait = 10000
日志：
2016-08-04 17:49:28,070 [main] DEBUG hikari.HikariConfig - HikariPool-1 - configuration:
2016-08-04 17:49:28,071 [main] DEBUG hikari.HikariConfig - allowPoolSuspension.............false
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - autoCommit......................true
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - catalog.........................null
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - connectionInitSql...............null
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - connectionTestQuery.............null
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - connectionTimeout...............10000
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - dataSource......................null
2016-08-04 17:49:28,072 [main] DEBUG hikari.HikariConfig - dataSourceClassName.............null
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - dataSourceJNDI..................null
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - dataSourceProperties............{password=<masked>}
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - driverClassName................."com.mysql.jdbc.Driver"
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - healthCheckProperties...........{}
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - healthCheckRegistry.............null
2016-08-04 17:49:28,073 [main] DEBUG hikari.HikariConfig - idleTimeout.....................600000
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - initializationFailFast..........true
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - isolateInternalQueries..........false
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - jdbc4ConnectionTest.............false
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - jdbcUrl........................."jdbc:mysql://localhost:3306/foo_test?autoReconnect=true"
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - leakDetectionThreshold..........0
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - maxLifetime.....................1800000
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - maximumPoolSize.................250
2016-08-04 17:49:28,074 [main] DEBUG hikari.HikariConfig - metricRegistry..................null
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - metricsTrackerFactory...........null
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - minimumIdle.....................250
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - password........................<masked>
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - poolName........................"HikariPool-1"
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - readOnly........................false
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - registerMbeans..................false
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - scheduledExecutorService........null
2016-08-04 17:49:28,075 [main] DEBUG hikari.HikariConfig - threadFactory...................null
2016-08-04 17:49:28,076 [main] DEBUG hikari.HikariConfig - transactionIsolation............null
2016-08-04 17:49:28,076 [main] DEBUG hikari.HikariConfig - username........................"root"
2016-08-04 17:49:28,076 [main] DEBUG hikari.HikariConfig - validationTimeout...............5000
2016-08-04 17:49:28,077 [main] INFO hikari.HikariDataSource - HikariPool-1 - Started.
2016-08-04 17:49:28,287 [main] INFO pool.PoolBase - HikariPool-1 - Driver does not support get/set network timeout for connections. (com.mysql.jdbc.JDBC4Connection.getNetworkTimeout()I)
2016-08-04 17:49:28,312 [HikariPool-1 housekeeper] DEBUG pool.HikariPool - HikariPool-1 - Pool stats (total=0, active=0, idle=0, waiting=0)
2016-08-04 17:49:28,381 [HikariPool-1 connection adder] DEBUG pool.HikariPool - HikariPool-1 - Added connection com.mysql.jdbc.JDBC4Connection@2929ca0e
....
然后我得到了很多这些：
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
...
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
但我认为这只是因为我的本地mysql设置，因为我在设置中使用生产池大小