[jboss-user] [Installation, Configuration & DEPLOYMENT] - Problems with Mysql Proxy r/w spliiting and Jboss Pool

[amardeep21]

Hi,

We are trying to implement r/w splitting with Jboss as Application Server for our
java application built on swt.

We have successfully implemented Mysql Master Master Replication under following Setup-

ServerA - Master
ServerB - Master
ServerC - Slave of ServerA
ServerD - Slave of ServerB

Everything works file using r/w splitting including load balancing.

The issues we are facing is when we leave our application running for some time
idle, jboss throws the following errors..

WARN [org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Unable to fill pool
org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

** BEGIN NESTED EXCEPTION **

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException
MESSAGE: Unknown command

STACKTRACE:

com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Unknown command
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:812)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3284)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1182)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
at com.mysql.jdbc.Connection.(Connection.java:1531)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:171)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:577)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:524)
at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74)
at java.lang.Thread.run(Thread.java:595)

** END NESTED EXCEPTION **

Last packet sent to the server was 2 ms ago.)
at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:179)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:577)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.fillToMin(InternalManagedConnectionPool.java:524)
at org.jboss.resource.connectionmanager.PoolFiller.run(PoolFiller.java:74)
at java.lang.Thread.run(Thread.java:595)
Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:

The current Setup of pool under r/w splitting is

-- connection pool
if not proxy.global.config.rwsplit then
proxy.global.config.rwsplit = {
min_idle_connections = 10,
max_idle_connections = 20,

is_debug = true
}
end

Whereas Jboss pool is set to

<min-pool-size>10</min-pool-size>
<max-pool-size>2000</max-pool-size>

I am not able to figure out what is causing problem jboss/proxy pool or something else due to which above error comes.

Any help is really appreciated.

Thanks,
Veneet

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