[jira] Commented: (DBCP-300) remove synchronize access of createDataSource

["Dapper Dano (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DBCP-300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890939#action_12890939 ] 

Dapper Dano commented on DBCP-300:
----------------------------------

Is there going to be any focus on this issue soon?  This can cause quite a few blocked threads if a datasource is timing out, as the first thread will block all others while attempting to connect (21 seconds by default).  After the first times out, the next one attempts to connect while the remaining wait and so on.  This can cause quite a back up.

In the mean time, has anyone found a workaround or alternative substitution for pools in the tomcat application context?

> remove synchronize access of createDataSource
> ---------------------------------------------
>
>                 Key: DBCP-300
>                 URL: https://issues.apache.org/jira/browse/DBCP-300
>             Project: Commons Dbcp
>          Issue Type: Improvement
>    Affects Versions: 1.2.2
>         Environment: RHEL, jdk1.5.0_12, commons-dbcp 1.2.2
>            Reporter: Nikhil Singh
>             Fix For: 2.0
>
>
> For JDK1.5 onwards we can make the DataSource volatile and start using "double checked locking" idiom. In my performance testing I have already started seeing wait time on this lock. 

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