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Message-ID: <4E160D5C.3010008@christopherschultz.net>
Date: Thu, 07 Jul 2011 15:47:40 -0400
From: Christopher Schultz <chris@christopherschultz.net>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: mod_jk restarting during uploads of large files
References: <20110704172736.141422tpj9su9zhc@mail.alt-v.co.uk>
 <4E14CD7D.10802@kippdata.de>
 <20110707093511.80201zzo5pbn590k@mail.alt-v.co.uk>
 <4E15C237.5020703@ice-sa.com>
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André ,

On 7/7/2011 10:27 AM, André Warnier wrote:
> Since this concerns large files upload, I wonder if something along 
> these lines is happening :
> 
> A file upload is a POST request, usually with an 
> enctype=multipart/form-data format (similar to an email with
> attachments). Furthermore, for sending this file, the browser is
> going to encode the file using Base64 encoding, which increases the
> brutto size by at least 1/3.  So your 500 MB file becomes something
> like 700 MB in the POST.

I don't think any browser does base64 encoding of files.

> Now let's imagine that by default Tomcat is buffering this in memory 
> until it has read the whole POST and can start parsing it.  That
> could easily cause some memory issues.

Tomcat itself (at least v5.5) does not handle file uploads itself. Most
people either roll their own (bad) or use commons-fileupload or
something similar.

Any buffering of any consequence will be done by a non-Tomcat component,
but could be easily configured to take up a lot of memory.

- -chris
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