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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 28211] New: - Specifying the maximum lifetime of a connection
Date Mon, 05 Apr 2004 15:53:22 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=28211

Specifying the maximum lifetime of a connection

           Summary: Specifying the maximum lifetime of a connection
           Product: Commons
           Version: 1.1 Final
          Platform: All
               URL: http://www.springframework.org
        OS/Version: All
            Status: NEW
          Severity: Enhancement
          Priority: Other
         Component: Dbcp
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: juergen.hoeller@werk3at.com


It would be excellent if BasicDataSource had a "maxLifetime" property, for 
specifying the maximum lifetime of a connection in the pool, no matter how long 
it's been active or idle, and no matter whether it still seems to be alive. 
Commons DBCP does not support this yet; it just offers various connection 
validation means, which is not the same.

This is particularly relevant for MySQL Connector/J 3.0.x which tries to apply 
some weird automatic recovery when a MySQL connection has timed out, resulting 
in all sorts of issues. The best way to deal with this is to set the maximum 
lifetime of a connection to 4 hours or the like: If it's older, simply kill it, 
even if it's still alive at that point of time.

Note that Proxool (http://proxool.sourceforge.net) does have such a property, 
namely "maximum-connection-lifetime". Resin's connection pool has a similar 
property named "max-pool-time" (http://www.caucho.com/resin-2.1/ref/db-
config.xtp). I tend to prefer Commons DBCP, but the lack of such a property 
forces me to look for alternative pools.

Juergen

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