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From j...@apache.org
Subject [jira] Closed: (JAMES-294) Database Pool becomes exhausted after a short time when heavily polled
Date Sat, 05 Jun 2004 04:22:53 GMT
Message:

   The following issue has been closed.

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View the issue:
  http://issues.apache.org/jira/browse/JAMES-294

Here is an overview of the issue:
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        Key: JAMES-294
    Summary: Database Pool becomes exhausted after a short time when heavily polled
       Type: Bug

     Status: Closed
   Priority: Major
 Resolution: CANNOT REPRODUCE

    Project: James
 Components: 
             UsersStore & UsersRepository
   Fix Fors:
             2.2.0RC5
   Versions:
             2.2.0RC3
             2.2.0RC4
             2.2.0RC1
             2.2.0RC2

   Assignee: Noel J. Bergman
   Reporter: Chris Means

    Created: Tue, 25 May 2004 5:50 AM
    Updated: Fri, 4 Jun 2004 9:22 PM
Environment: Windows NT v4.0, Java 1.4.2

Description:
I've had RC3 running for the past week.

Other than an issue I ran into with the config.xml when translating changes from my 0a4 configuration,
RC3 has been running quite well except for a new problem that appears to have surfaced.

This issue may relate to the fact that I've also been evaluating Mars
(http://leapfrog-mars.sourceforge.net/) for monitoring services.

Here's the exception that's occurring in the pop3server log:

23/05/04 11:01:58 ERROR pop3server: Exception during connection from intfar.com (66.92.129.218)
: An exception occurred getting a database connection.
org.apache.avalon.framework.CascadingRuntimeException: An exception occurred getting a database
connection.
	at
org.apache.james.userrepository.AbstractJdbcUsersRepository.openConnection(A
bstractJdbcUsersRepository.java:601)
	at
org.apache.james.userrepository.AbstractJdbcUsersRepository.getUserByName(Ab
stractJdbcUsersRepository.java:506)
	at
org.apache.james.userrepository.AbstractUsersRepository.test(AbstractUsersRe
pository.java:284)
	at
org.apache.james.pop3server.POP3Handler.doPASS(POP3Handler.java:528)
	at
org.apache.james.pop3server.POP3Handler.parseCommand(POP3Handler.java:470)
	at
org.apache.james.pop3server.POP3Handler.handleConnection(POP3Handler.java:26
6)
	at
org.apache.james.util.connection.ServerConnection$ClientConnectionRunner.run
(ServerConnection.java:417)
	at
org.apache.james.util.thread.ExecutableRunnable.execute(ExecutableRunnable.j
ava:55)
	at
org.apache.james.util.thread.WorkerThread.run(WorkerThread.java:90)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool exhausted,
cause: Timeout waiting for idle object
	at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.ja
va:148)
	at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:5
18)
	at
org.apache.james.util.dbcp.JdbcDataSource.getConnection(JdbcDataSource.java:
218)
	at
org.apache.james.userrepository.AbstractJdbcUsersRepository.openConnection(A
bstractJdbcUsersRepository.java:598)
	... 8 more
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
	at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPoo
l.java:801)
	at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.ja
va:140)
	... 11 more

This an exception from mailstore log:

23/05/04 10:31:09 ERROR mailstore: Error retrieving messageCannot get a connection, pool exhausted0nullnull
23/05/04 10:31:09 ERROR mailstore: Exception during retrieve -- skipping item Mail1085326264738-657
javax.mail.MessagingException: Exception while retrieving mail: Cannot get a connection, pool
exhausted
	at
org.apache.james.mailrepository.JDBCMailRepository.retrieve(JDBCMailReposito
ry.java:905)
	at
org.apache.james.mailrepository.JDBCSpoolRepository.accept(JDBCSpoolReposito
ry.java:199)
	at
org.apache.james.mailrepository.JDBCSpoolRepository.accept(JDBCSpoolReposito
ry.java:124)
	at
org.apache.james.transport.JamesSpoolManager.run(JamesSpoolManager.java:350)
	at java.lang.Thread.run(Thread.java:536)

Some background:

I am the primary user of this mail server.  My M$ Outlook checks 5 different accounts every
5 minutes.

Since I've been evaluating Mars, I've had it monitoring access for POP3 and SMTP every minute,
with a 5 second timeout.

I think it's this last point that's likely causing the problem.  Am I expecting too much from
James?  My monitoring too aggressive?

As this seems to be a new issue, I didn't think RC4 was likely to solve it.



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