Tag Archives: j2k

geek linux rant

File system full, but why?

May 26, 2009 – 10:23 pm

0101010101UPDATE: posted my workaround code below, good feedback already from Ryan (djatoka dev) and I’ll be testing the proper fix on the server soon.
I’ve got a server that keeps filling up its disk space and failing to serve images after it gets to the file system full error message.  First of all let me say, I don’t blame it in the least, if the admin (aka me) doesn’t do enough to secure the server enough disk space to do its job, I say, let me have it.  But after I’ve set the suspect daemon to use a *reasonable* amount of space I stopped thinking of it as the culprit, so when this issue arose again, I looked elsewhere for the cause.  Fast forward to today, the server’s file system filled up again, and refused to serve any more data, again, I totally understand where the server is coming from, if it doesn’t have enough disk space to do its job, it shouldn’t have to apologize to anyone; it’s all on the admin (again, aka, me), but what was going on?

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geek howto linux

HOWTO: serve jpeg2000 images with a scalable infrastructure

January 27, 2009 – 12:47 am

page1At the Biodiversity Heritage Library, we have replaced a proprietary jpeg2000 image server, that was straining under the load, with a new, open source jpeg2000 server, djatoka. Chris Freeland and Chris Moyers cover the background in far more detail on the BHL Blog, so here I’ll cover my rationale and decisions I made to provide a scalable, stable infrastructure to provide the images as efficiently as possible.

When I started sketching out how I wanted to run djatoka, I knew I wanted it to provide security, caching for performance and scalability and fault tolerance. Our server runs Tomcat, which I didn’t want to be public facing. Because of this I proxy Tomcat requests through Apache with the use of ajp_proxy, the successor to the old mod_jk. Initially I was using nginx in place of Apache, but after reading about all the functionality and performance improvements ajp_proxy offered, it was a no brainier; this is how to present Tomcat in a production environment.

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