[ome-devel] Problem with float point image channel min/max range

[José Salavert Torres]

Dear OMERO developers,

I am on commit “c6f9a94b0a16ac352e1d7287954d08c0d881eb06”.
When asking for images through the Webserver gateway, I have experienced a problem that hangs the server.


If I send an URL like:

	... /webgateway/render_image_region/35203/99/0?c=1|0:0&region=29,0,169,169”

with the channel min and max values equal to zero:

	?c=1|0:0

the server starts an intensive computation and stops returning any other image requests (the service is down due the overloading until you reset it).

Also, if the minimum / maximum range is smaller than the precision this has an impact in the performance that is greater the narrower this range is. i.e given :

	min = -10
	max = 30

A call with:

	?c=1|20.00:22.01

Will trigger an image calculation that will take a lot of time and resources, slowing down the server and making it unresponsive for several minutes.

Can you reproduce these issues?

José

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