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Re: [geclipse-dev] GRIA data managmement
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On Fri, 8 Aug 2008, Ariel Garcia wrote:
Hi,
Similarly, some time ago we had some discussion about annotating
data stagers to show if they were full or empty. What happened about
this?
We should fit into eclipse EFS model, which has not special state
empty/full. We don't want add this new feature.
Currently you can check if stager is empty in Properties View: length 0
means empty.
Yes, i agree with that. Empty or "full" but with 0 bytes makes no practical
difference for the user (and even 1-byte big means for all practical
purposes also 'empty' ;-)) . Also normal filemanagers don't distinguish
between files which are 0 bytes big and others.
I disagree. 0-byte file is something completely different than no file.
E.g. 0-bytes output file from my software means some problem with
computation or writing data. No file means that my software crashed before
computation part.
E.g.2 My software can look into local directory if file exists or
not and take some actions or not. Than I can modify the application
behaviour just be filling or clearing stager without modifying job
description. (This is not possible now for GRIA because job submission
failes if input data set to empty stager)
Another usage is a file as a semaphor. Existence or not of such file is
very important. E.g. look into /etc/grid-security/gridmapdir/ on any
gLite machine. There a plenty of 0-bytes files. But try to delete them
and you will fall into problems very soon.
Regards,
Pawel
