由以下原因引起:org.postgresql.util.PSQLException:致命:剩余的连接插槽保留用于非复制超级用户连接 [英] Caused by: org.postgresql.util.PSQLException: FATAL: remaining connection slots are reserved for non-replication superuser connections
问题描述
我使用c3p0-0.9.5.2.jar和mchange-commons-java-0.2.11.jar来管理池连接
,然后使用postgreSql 9.3。
I use c3p0-0.9.5.2.jar and mchange-commons-java-0.2.11.jar to manage the pool connection, And I use postgreSql 9.3.
我每天在Prod环境中至少收到一次这些消息:
I get these messages at least once a day in my Prod environment :
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:692)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
... 212 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1469)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685)
... 215 more
Caused by: org.postgresql.util.PSQLException: FATAL: remaining connection slots are reserved for non-replication superuser connections
at org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages(ConnectionFactoryImpl.java:712)
我的应用程序中包含此配置:
I have this config in my aplication :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="dataSource" class = "com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="org.postgresql.Driver"/>
<property name="jdbcUrl" value="jdbc:postgresql://localhost:5432/Test"/>
<property name="user" value="postgres"/>
<property name="password" value="postgres"/>
<!-- pool sizing -->
<!-- pool sizing -->
<property name="initialPoolSize" value="32" />
<property name="minPoolSize" value="30" />
<property name="maxPoolSize" value="300" />
<property name="acquireIncrement" value="10" />
<property name="maxStatements" value="0" />
<!-- retries -->
<property name="acquireRetryAttempts" value="30" />
<property name="acquireRetryDelay" value="1000" /> <!-- 1s -->
<property name="breakAfterAcquireFailure" value="false" />
<!-- refreshing connections -->
<property name="maxIdleTime" value="180" /> <!-- 3min -->
<property name="maxConnectionAge" value="10" /> <!-- 1h -->
<!-- timeouts and testing -->
<property name="checkoutTimeout" value="0" /> <!-- 60s -->
<property name="idleConnectionTestPeriod" value="60" /> <!-- 60 -->
<property name="testConnectionOnCheckout" value="true" />
<property name="preferredTestQuery" value="SELECT 1" />
<property name="testConnectionOnCheckin" value="true" />
</bean>
</beans>
在postgresql.conf中,我有此配置:
in postgresql.conf I have this config :
max_connections = 300
shared_buffers = 32GB
我的服务器具有以下性能: 24 cpu,256 GB内存
my server has this performance: 24 cpu, 256 GB memory
使用该应用程序的用户数约为1300
the number of users using the application is around 1300
有人可以帮助我解决这个问题
is there anyone who can help me to solve this problem
预先感谢您
推荐答案
有为超级用户保留的 superuser_reserved_connections
连接插槽(默认为 3 )这样即使在占用所有连接插槽的情况下,它们也可以连接。
There are superuser_reserved_connections
connections slots (3 by default) that are reserved for superusers so that they can connect even in a situation where all connection slots are taken.
因此,您实际上只有297个可用插槽。
So you effectively only have 297 slots available.
减少PostgreSQL中连接池的最大连接数或增加 max_connections
。
Either reduce the maximum number of connections of your connection pool or increase max_connections
in PostgreSQL.
顺便说一句,300太高了。您应该对连接池使用低得多的设置(除非数据库计算机中有数百个内核)。
By the way, 300 is much too high. You should use a much lower setting with a connection pool (unless you have hundreds of cores in your database machine).
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