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From "Manoj (JIRA)" <j...@apache.org>
Subject [jira] Commented: (POOL-107) number of connections created has crossed more than maxActive
Date Tue, 09 Feb 2010 16:39:28 GMT

    [ https://issues.apache.org/jira/browse/POOL-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831528#action_12831528
] 

Manoj commented on POOL-107:
----------------------------

The problem of exceeding maximum number of  connection still happens for us even after upgrading
to 1.5.2.

The issue is that it keep max active to the value set while creating the GenericObjectPool
but in the backend it keep creating and closing the connections so it doesn't get Exhausted.
We have not WhenExhaustedAction since it default to BLOCK. This is only reproducible in the
hight load scenario.



> number of connections created has crossed more than maxActive 
> --------------------------------------------------------------
>
>                 Key: POOL-107
>                 URL: https://issues.apache.org/jira/browse/POOL-107
>             Project: Commons Pool
>          Issue Type: Bug
>    Affects Versions: 1.3
>         Environment: OS:Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
> uname:Linux 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 i686
> vm_info: Java HotSpot(TM) Server VM (1.4.2_13-b06) for
> linux-x86, built
> on Oct 18 2006 09:55:11 by unknown with unknown compiler
>            Reporter: Bhaskar NA
>             Fix For: 1.5
>
>
> I found that when the minIdle is configured then during loads, common pool creates more
number of connections  it will be greater than maxActive.
> When I had following settings:
> maxActive = 50
> maxIdle = 30
> minIdle=30
> factory=org.apache.commons.dbcp.BasicDataSourceFactory
> maxWait=10000
> timeBetweenEvictionRunsMillis=900000
> numTestsPerEvictionRun=50
> minEvictableIdleTimeMillis=1800000
> testWhileIdle=true
> testOnBorrow = true
> validationQuery='select 1 from dual'
> Number of connections in the pool went upto 121. (found thru netstat)
> When I changed minIdle to 15 and did my load test connecitons in the pool went upto 66
> Looks like maxActive is getting bypassed with minIdle.
> When I changed minIdle to 10 and maxActive to 30 and maxIdle to 30 then number of connections
went upto 40.
> Can someone please throw light on what is going on here? I am using DBCP 1.2.1 and common
pool 1.3.
> Bhaskar

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