[undertow-dev] Lingering session resources in keepalive

[Eric Peters]

I honestly was expecting the answer to that to be Undertow 1.1.4, but in double-checking I found it’s on Undertow 1.1.0.  Time I skim the patches from 1.1.0 on up to see if anything could have addressed this.

Honestly, I’ve got two angles here:

1)      I need a reliable solution which has a minimum of caveats. Updating in 1.1.x or configuration changes preferred, but if patches are needed, so be it

2)      Did we stumble on a shortcoming in Undertow?  Honestly, I think this can be argued both ways.   If this has merit as a flaw, I’d like to get the find to the right people.

//EricP

From: Tomaž Cerar [mailto:tomaz.cerar at gmail.com]
Sent: Thursday, June 18, 2015 2:47 PM
To: Eric Peters
Cc: undertow-dev at lists.jboss.org
Subject: Re: [undertow-dev] Lingering session resources in keepalive

What version of undertow are you using?

On Thu, Jun 18, 2015 at 4:57 PM, Eric Peters <epeters at epicor.com<mailto:epeters at epicor.com>> wrote:
We’re still trying to confirm things on our end, so it’s still possible a wrong assumption’s been made somewhere, but it looks like session resources are lingering with the http connection after the session has expired.

From one of the heap dumps, following session data that expired the previous day back to a GC root:
http://imgur.com/Ov8xFy1
That’s from a dump where the read-timeout was disabled.

We can set the read-timeout, but I don’t know if the behavior of keep-alive will limit the impact of the read timeout.  After the reply has been created and sent, do the particulars of the request or reply need to be kept beyond the expiry of the session they were for?

Is there a way to disable keep-alive?  In this particular instance it’s more important that the resources be freed up timely than it is that the server use keep-alive to give a boost on performance..

//EricP


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