Re: [Treebase-devel] load balancing treebase?

[Shyket, H. <har...@ya...>]

The Dryad issue comes down to whether the files are all synced across the multiple instances of Tomcat.

Mattison,

What happens when a file is created on one TreeBASE instance, but then there is an attempt to access it from another?

Thanks,

Harry Shyket
Digital Media Specialist
Yale University Peabody Museum
ph. 203-436-9428
har...@ya...

From: William Piel [mailto:wil...@ya...]
Sent: Wednesday, July 25, 2012 10:44 AM
To: Mattison Ward
Cc: TreeBASE devel
Subject: Re: [Treebase-devel] load balancing treebase?


On Jul 25, 2012, at 9:36 AM, Mattison Ward wrote:


The web server would load balance by session such that a session would
always be handled by the same tomcat instance (unless the instance
failed).

Much of it should work okay -- e.g. seeing as uploaded files are stored as blobs in the database, so should be accessible by all tomcat instances.

Harry can correct me if I'm wrong -- but I think that one place where this might not work is in the handshaking between Dryad and TreeBASE: files get pushed at one time point while the user is logged into Dryad, an email with a link to TreeBASE is issued, then at a later point the user follows the email link and the delivered file is unpacked and parked into the user's TreeBASE account. So there might be a problem with files pushed from Dryad winding up in the directory of a different instance from what the user later uses to try to retrieve it.

bp