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From "Idea Harness (JIRA)" <server-...@james.apache.org>
Subject [jira] [Commented] (JAMES-1394) Mails stuck in queue/spool
Date Fri, 06 Jul 2012 15:41:34 GMT

    [ https://issues.apache.org/jira/browse/JAMES-1394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13408071#comment-13408071

Idea Harness commented on JAMES-1394:

Hi Thomas,

We had a similar problem to the one you described in James 3.0 Beta3 with about 1000 emails
being sent at Apache James all at once. After upgrading to Apache James 3.0 Beta4 the problem
no longer happens. 
Do you still experience the problem after upgrading to Apache James 3.0 Beta4 ? I am trying
to see whether this issue has been truly fixed in Apache James 3.0 Beta4. 

> Mails stuck in queue/spool
> --------------------------
>                 Key: JAMES-1394
>                 URL: https://issues.apache.org/jira/browse/JAMES-1394
>             Project: JAMES Server
>          Issue Type: Bug
>          Components: Queue, Remote Delivery
>    Affects Versions: 3.0-beta3
>         Environment: James 3.0 Beta3
> linux 2.6.24-23-xen #1 SMP Mon Jan 26 03:09:12 UTC 2009 x86_64 GNU/Linux
>            Reporter: Thomas Eichmann
>         Attachments: jstack-output-stuck.txt, out.txt
> Issue created based on mailing list discussion here:
> http://www.mail-archive.com/server-user@james.apache.org/msg13171.html
> Citing the mail content:
> First a short background info, what our company would like to achieve using James. We
have several clients that need mass-mailing capability, thus we want to create a system that
allows us to track these mails and especially store errors from bounces (also by using VERP),
so we can block unreachable addresses. I created a few custom mailets to handle those requirements
and a custom RemoteDelivery implementation for creating VERP style sender addresses. The storage
is all done in a MySQL database via JPA. Currently we use it for one client which is not sending
huge amounts of mails, around 80,000 per month.
> The system works well, but it happens after a bigger batch of mails (around 4,000 mails)
that the mail queueing system gets somehow "stuck". The SMTP server is able to retrieve new
mails, but somehow they don't get send out, until I restart the server. Sometimes a flush()
on queue/spool helps, but most of the times a restart is necessary.
> I added logging to my mailets when they start and finish to see if there is a problem,
but they seem to run fine (no exceptions). It seems that the mails that arrive after James
gets stuck get processed normally by the mailets, but somehow are not dequeued and sent out.
> Server info
> James 3.0 Beta3
> linux 2.6.24-23-xen #1 SMP Mon Jan 26 03:09:12 UTC 2009 x86_64 GNU/Linux
> Frankly I'm not sure what is the best way to debug this kind of problem with James. I
could find a few other threads with people describing similar problems, but I couldn't get
closer to the problem.
> Here some data from JMX that I took while the server was in "stuck" status.
> =======================================================
> INFO org.apache.james:type=component,name=queue,queue=outgoing
> =======================================================
> Size == 80
> =======================================================
> INFO org.apache.james:type=component,name=queue,queue=spool
> =======================================================
> Size == 0
> =======================================================
> INFO org.apache.james:type=component,component=mailetcontainer,name=mailspooler
> =======================================================
> CurrentSpoolCount == 0
> ThreadCount == 20
> =======================================================
> INFO org.apache.james:type=component,component=mailetcontainer,name=mailspooler,sub-type=threadpool,threadpool=dequeuer
> =======================================================
> TotalTasks == 0
> AverageTaskTime == 0.0
> ActiveThreads == 2
> ActiveTasks == 2
> QueuedTasks == 0
> MaximalThreads == 2
> =======================================================
> INFO org.apache.james:type=component,component=mailetcontainer,name=mailspooler,sub-type=threadpool,threadpool=spooler
> =======================================================
> TotalTasks == 4653
> AverageTaskTime == 145.0
> ActiveThreads == 20
> ActiveTasks == 0
> QueuedTasks == 0
> MaximalThreads == 20
> I also created a jstack output, as it was suggested in one of the threads I found. I
can post it here as well if it could be helpful (I didn't do it now, because the file is quite
> This is the logging output when a new mail is sent while the queue is stuck (IgnoreBlockedMailet
and SendAttemptLogMailet are my custom mailets):
> DEBUG 03:54:46,819 | james.mailspooler | ==== Begin processing mail Mail1322625286815-aa8034cb-4d50-4044-926f-10bbe8b637e5====
> DEBUG 03:54:46,819 | james.mailprocessor | Call MailProcessor root
> INFO  03:54:46,827 | james.mailetcontext | IgnoreBlockedMailet called - recipients=[t.eichmann@eggsist.com]
> INFO  03:54:46,847 | james.mailetcontext | IgnoreBlockedMailet finished - recipients=[t.eichmann@eggsist.com]
> DEBUG 03:54:46,847 | james.mailprocessor | Call MailProcessor transport
> INFO  03:54:46,863 | james.mailetcontext | SendAttemptLogMailet called - recipients=[t.eichmann@eggsist.com]
> INFO  03:54:46,927 | james.mailetcontext | SendAttemptLogMailet finished - recipients=[t.eichmann@eggsist.com]
> DEBUG 03:54:46,931 | james.mailprocessor | End of mailetprocessor for state root reached
> What is missing is this part, which usually follows when the server is functioning (at
least follows after a few minutes if the server is busy).
> INFO  03:54:46,943 | james.mailetcontext | Attempting delivery of Mail1322620955282-2b903c2d-8378-4a10-848b-6ebd489182bf-to-eggsist.com
to host ASPMX.L.GOOGLE.com. at from bounce+t.eichmann=eggsist.com@???.com for
addresses [t.eichmann@eggsist.com]
> INFO  03:54:47,671 | james.mailetcontext | Mail (Mail1322620955282-2b903c2d-8378-4a10-848b-6ebd489182bf-to-eggsist.com)
sent successfully to ASPMX.L.GOOGLE.com. at from bounce+t.eichmann=eggsist.com@???.com
for [t.eichmann@eggsist.com]
> There are a couple of mails that get re-queued 25 times (default limit for attempts)
due to DNS issues (like no MX entry for a domain etc.) until they are bounced in the system.
But I assume James should be able to handle such mails and new ones in the queue without problems.
> Is there a way to examine mails that are queued and their status? Like how many times
are they already being re-queued, why are they still in the queue etc.? I'm really not sure
how I can debug this issue as I'm new to James. Any help is very appreciated.

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