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From "yixin he (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DBCP-377) Dbcp Idle Check Mechanism Doesn't Work
Date Tue, 06 Mar 2012 16:48:59 GMT

    [ https://issues.apache.org/jira/browse/DBCP-377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223409#comment-13223409
] 

yixin he commented on DBCP-377:
-------------------------------

Hi Mark:

this could occur one to several times per day under heavy load
we use commons-pool 1.5.4
ok we will check whether the app really obtains never-used connectios and then adjust somes
configures for more tests.

thanks for your help.


                
> Dbcp Idle Check Mechanism Doesn't Work
> --------------------------------------
>
>                 Key: DBCP-377
>                 URL: https://issues.apache.org/jira/browse/DBCP-377
>             Project: Commons Dbcp
>          Issue Type: Bug
>    Affects Versions: 1.4
>         Environment: Linux mysql 5.1.4
>            Reporter: yixin he
>            Priority: Critical
>
> Using :commons-dbcp-1.4.jar version
> we use a distributed data access layer for Database Sharding with mysql
> our web servers use mysql jdbc driver 1.5.4 to connect to this middleware layer with
F5 between them for load balance.
> the middleware layer will discard db links that idle for longger than 1 hour,and our
dbcp configures to close links that idle for 
> longger than 30 minutes.
> here we occurred exceptions as follows:
> {code}
>     java.net.SocketException
> MESSAGE: Broken pipe
> STACKTRACE:
> java.net.SocketException: Broken pipe
>         at java.net.SocketOutputStream.socketWrite0(Native Method)
>         at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
>         at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>         at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>         at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
>         at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:2637)
>         at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1554)
>         at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
>         at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
>         at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
>         at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:794)
>         ....
>         at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
>         at org.apache.commons.dbcp.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:172)
> {code}
> it seems that there are times when the links get from pool they have already been broken,we
know that they are forcely closed by the middleware layer、but as dbcp idle check more frequently
than the middleware layer(30m to 60m). How can this happen as the idle links
> should have been closed by dbcp first. Are there any problems for the dbcp idle check
Mechanism?
> our dbcp configurations are as follows
> {code}
>     <property name="maxActive"><value>20</value></property>
>     <property name="initialSize"><value>1</value></property>
>     <property name="maxWait"><value>60000</value></property>
>     <property name="maxIdle"><value>20</value></property>
>     <property name="minIdle"><value>5</value></property>
>     <property name="removeAbandoned"><value>true</value></property>
>     <property name="removeAbandonedTimeout"><value>180</value></property>
>     <property name="connectionProperties"><value>clientEncoding=GBK</value></property>
>     <property name="timeBetweenEvictionRunsMillis"><value>60000</value></property>
>     <property name="minEvictableIdleTimeMillis"><value>1800000</value></property>
>     <property name="testWhileIdle"><value>true</value></property>
>     <property name="testOnBorrow"><value>false</value></property>
>     <property name="testOnReturn"><value>false</value></property>
>     <property name="validationQuery"><value>SELECT @@SQL_MODE</value></property>
>     <property name="numTestsPerEvictionRun"><value>32</value></property>
> {code}

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