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From Mark Thomas <ma...@apache.org>
Subject Re: Connection Pool Tuning
Date Tue, 30 Jun 2009 20:56:58 GMT
daniel steel wrote:
> hi all,
>   we are running a load test using tomcat6 with SQL Server and dbcp connection pooling.
> This is our current conn pool set up - Some of the parameters are not ideal for prod
env..
> 
> initialSize="5"
> maxActive="-2"
> maxIdle="85"
> maxWait="10000"
> timeBetweenEvictionRunsMillis="1800000"
> removeAbandoned="true"
> removeAbandonedTimeout="4"
> 
> During the run, for some of the long running jsp  we started getting errors and logs
had these kind of errors..
> 
> 1.
> java.sql.SQLException: Connection net.sourceforge.jtds.jdbc.ConnectionJDBC3@a6ebc0c is
closed.
>     at org.apache.tomcat.dbcp.dbcp.DelegatingConnection.checkOpen(DelegatingConnection.java:354)
>     at org.apache.tomcat.dbcp.dbcp.DelegatingConnection.createStatement(DelegatingConnection.java:222)
>     at org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.createStatement(PoolingDataSource.java:205)
> 
> 2. 
> java.sql.SQLException: Invalid state, the Connection object is closed.
>     at net.sourceforge.jtds.jdbc.TdsCore.checkOpen(TdsCore.java:448)
>     at net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:946)
>     at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:406)
>     at net.sourceforge.jtds.jdbc.JtdsStatement.executeQuery(JtdsStatement.java:1258)
>     at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
> 
> Is these errors because of removeAbandonedTimeoutsetting?

Almost certainly.

> would increasing the timeout help in reducing the errors?

Have you tried increasing it?

> or 
> what would cause these errors? 
> would turning on logAbandoned help to correlate these errors to connection closed by
dbcp?

That won't hurt and will at least give you more information about what
is going on.

Mark


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