[OGSA-D-WG] Fw: Definition of data consistency
Allen Luniewski
luniew at us.ibm.com
Tue Oct 9 11:50:18 CDT 2007
Please see Jem's note below - he can not post to this DL.
I think that his suggestion is a good one.
Allen Luniewski
IBM Cross Brand Services
IBM Silicon Valley Laboratory
555 Bailey Ave.
San Jose, CA 95141
408-463-2255
408-930-1844 (mobile)
----- Forwarded by Allen Luniewski/Almaden/IBM on 10/09/2007 09:49 AM -----
"Treadwell, Jem"
<jem.treadwell at hp
.com> To
Dave Berry <daveb at nesc.ac.uk>,
10/09/2007 09:40 Allen Luniewski
AM <luniew at almaden.ibm.com>
cc
Subject
FW: [OGSA-D-WG] ***SPAM***
Definition of data consistency
Allen/Dave, I can’t mail the data mailing list, so please feel free to pass
this on if you think it’s worthwhile.
I agree with Allen about sounding specific, and this is a hard thing to
turn into a direct definition without using some term such as “indication.”
You might think about using an indirect form:
Data consistency: An instance of data is said to be “consistent” with
one or more other instances of that data if it is up-to-date with
respect to those instances.
That may be enough, but you could also add something like:
In a given system a policy may define the rules for determining
whether data is up-to-date, and for maintaining consistency.
- Jem
Jem Treadwell
Software Engineer
HP ESS Software
856.638.6021 office | 856.638.6190 fax | jem.treadwell at hp.com
6000 Irwin Road | Mount Laurel | NJ 08054
http://www.hp.com/go/vse
hp
From: Allen Luniewski [mailto:luniew at us.ibm.com]
Sent: Monday, October 08, 2007 5:20 PM
To: Dave Berry
Cc: Treadwell, Jem; ogsa-d-wg at ogf.org
Subject: Re: [OGSA-D-WG] ***SPAM*** Definition of data consistency
Dave,
I think that I am okay with that suggested change. I am a little bit
worried about using the word "measure" as it can be taken to imply things
that we really do not want to address (e.g., a means to measure and a
quantifiable scale for measurement). I thought about suggesting changing "A
measure" to "An indication" but that seems just a bit too vague to me. I
don't have a better suggestion right now.
Allen Luniewski
IBM Cross Brand Services
IBM Silicon Valley Laboratory
555 Bailey Ave.
San Jose, CA 95141
408-463-2255
408-930-1844 (mobile)
Inactive hide details for "Dave Berry" <daveb at nesc.ac.uk>"Dave Berry"
<daveb at nesc.ac.uk>
"Dave Berry"
<daveb at nesc.a
c.uk>
Sent by:
ogsa-d-wg-bou To
nces at ogf.org
<ogsa-d-wg at ogf.org>
10/08/2007 cc
02:11 PM
"Treadwell, Jem"
<jem.treadwell at hp.com>
Subject
[OGSA-D-WG] ***SPAM***
Definition of data
consistency
Jem queried our definition of data consistency, which is currently:
|--------------------------------------------------------------------------|
| A policy that specifies or describes how up-to-date an instance of data |
| is in one service of a distributed system, with respect to one or more |
| instances of that data elsewhere in the system. |
|--------------------------------------------------------------------------|
Jem said (in e-mail):
my thought was that data consistency would be a state of the data - it's
consistent w.r.t. some other set of data or it isn't; the policy would be
the rules that determine whether it is, and what the requirements are.
I've had a look through our document and I agree. We refer to data
consistency policies but also to data consistency requirements, mechanisms
and strategies.
So, how about this as a revised definntion:
"A measure of how up-to-date an instance of data is in one service of a
distributed system, with respect to one or more instances of that data
elsewhere in the system."
Best wishes,
Dave Berry
Deputy Director, Research & E-infrastructure Development
National e-Science Centre
15 South College Street, Edinburgh, EH8 9AA
+44 131 651 4039 www.nesc.ac.uk
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