November 2005 - ogsa-wg - lists.ogf.org

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25 Nov '05

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25 Nov '05

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BT Messaging Anti-Virus Alert
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24 Nov '05

Notification Of Blocked e-mail - This message is intended for BT employees only. All other recipients: Please ignore this message and accept our apology for any inconvenience (N.B. the links below are private). An e-mail (summarised below) has been blocked at the BT e-mail gateway because it contained an attachment of a potentially dangerous type <http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm> or a computer virus. Date/Time: "24 Nov 2005 03:41:26" From: "Symantec_AntiVirus_for_SMTP_Gateways(a)capitolindemnity.com" Subject: "Returned mail" Blocked file: "mailtext.zip" Virus Name: "Sober.dam" BT Employees: If there is a legitimate business requirement for this e-mail, please ask the originator to re-send it. You must advise them to follow the special instructions, which you will find at this location <http://antivirus.intra.bt.com/zippass.htm> for re-sending e-mail of this type. They should also ensure that the e-mail is virus-free. More information on blocked attachments can be found at http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm <http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm> Please do not reply to this email. Thank you. BT Teamconnect Enterprise Solutions British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no. 1800000 This electronic message contains information from British Telecommunications plc which may be privileged or confidential. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. Generated by: C04

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BT Messaging Anti-Virus Alert
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24 Nov '05

Notification Of Blocked e-mail - This message is intended for BT employees only. All other recipients: Please ignore this message and accept our apology for any inconvenience (N.B. the links below are private). An e-mail (summarised below) has been blocked at the BT e-mail gateway because it contained an attachment of a potentially dangerous type <http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm> or a computer virus. Date/Time: "24 Nov 2005 03:41:19" From: "Symantec_AntiVirus_for_SMTP_Gateways(a)capitolindemnity.com" Subject: "Returned mail" Blocked file: "mailtext.zip" Virus Name: "Sober.dam" BT Employees: If there is a legitimate business requirement for this e-mail, please ask the originator to re-send it. You must advise them to follow the special instructions, which you will find at this location <http://antivirus.intra.bt.com/zippass.htm> for re-sending e-mail of this type. They should also ensure that the e-mail is virus-free. More information on blocked attachments can be found at http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm <http://teamconnect.intra.bt.com/pas/m/email/antivirus/blocked.htm> Please do not reply to this email. Thank you. BT Teamconnect Enterprise Solutions British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no. 1800000 This electronic message contains information from British Telecommunications plc which may be privileged or confidential. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. Generated by: C02

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Returned mail
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24 Nov '05

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Returned mail
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24 Nov '05

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Virus Found in message "hi ive a new mail address"
by Janice VanWagoner 23 Nov '05

23 Nov '05

Symantec AntiVirus found a virus in an attachment you (grdfm-ogsa-wg-outgoing(a)mailbouncer.mcs.anl.gov <grdfm-ogsa-wg-outgoing(a)mailbouncer.mcs.anl.gov>) sent to emailserv(a)tomia247.com. To ensure the recipient(s) are able to use the files you sent, perform a virus scan on your computer, clean any infected files, then resend this attachment. Attachment: mailtext.zip Virus name: Multiple viruses found. Please see individual log messages. Action taken: Quarantine succeeded : File status: Still contains 1 infected items

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RE: [ogsa-wg] Once upon a time or two ...
by Dave Berry 23 Nov '05

23 Nov '05

There are many issues in this discussion that I don't understand , and this seems a key one. Perhaps the participants could read the following and set me straight? The W3C guidelines on the use of URIs (and hence, I presume, IRIs) is that each resource should be identified by a different URI. URIs can be compared. URIs should not be reused to refer to different resources. I don't know whether these guidelines are adhered to in practice, but on paper they seem to provide the uniqueness and comparison functionality that we require. The problem seems to be that WS-Addressing (or perhaps just some uses of it, e.g. some implementations of WSRF) breaks this nice system, by using the URI to name the access mechanism (the web service) rather than the resource being addressed. Frank has suggested on a couple of occasions that we specify how a unique address can be reconstructed from the wsa:to field and the parameters. Given this step, I would assume that the scenario that Frank considers here would not be permitted: > > An EPR-minter can decide to create a new EPR for a resource and reuse > > an Address that was used for an other resource before. So, I have many questions: 1. Is the above characterisation an accurate rendition of the W3C position on URIs and IRIs? 2. Do we want stricter limits than the W3C? 3. Can we profile WS-A as Frank suggests? 4. If (3 and not(2)), does that satisfy our requirements? Another advantage of URIs is that publishers are permitted to use their structure to pass back server-specified information and clients are permitted to parse URIs to extract this information. So an LSF system could include the job-id in a certain part of the URI and clients can extract it as necessary. (Although one could argue whether that was any neater than adding a specific XML field). Best wishes, Dave. > -----Original Message----- > From: owner-ogsa-wg(a)ggf.org [mailto:owner-ogsa-wg@ggf.org] On > Behalf Of David Snelling > Sent: 18 November 2005 15:12 > To: Frank Siebenlist > Cc: ogsa-wg; ogsa-naming-wg(a)ggf.org > Subject: [ogsa-wg] Once upon a time or two ... > > Folks, > > Once up on a time or two Frank wrote: > > > Without the proper uniqueness guarantees for the > wsa:Address, the use > > of ws-naming's AbstractName is meaningless. > > > > The EPR with an embedded AbstractName essentially describes > a binding > > between the Address and the AbstractName. > > One could argue that this binding is a bit of a flaky assertion > > without any way to specify time-validity or issuer. > > As a result, one can not see from an EPR alone when it was > issued or > > whether it is still valid or not. > > > > This would yield the undesirable situation that you would have two > > EPRs with identical Addresses and two different AbstractNames > > associated with different resources, and the client would > have no way > > to see which one of the EPRs is valid... > > > > For example, if I have two EPRs with the same Address, > where one EPR > > includes an AbstractName that identifies MyBankAccount and > the other > > includes an AbstractName identifying YourBankAccount, then > one of us > > will not be happy with that situation... > > > > In order to avoid this ambiguity, we need the guarantee from the > > EPR-minter that Address values will not be reused for different > > resources: for all times, the Address should either refer > to that one > > and only resource, or it should be invalid (and it is allowed to > > change between those two states). > > Furthermore, the EPR-minters should ensure that globally unique > > Addresses are used for a resource such that different > EPR-minters do > > not (accidentally) use the same Address for different resources. > > The described uniqueness properties of the Address constitutes a > > required EPR-minter profile for the use of AbstractNames. > > > > This issue has yet to be addressed to my satisfaction. There > have been > a number of email exchanges in response to it on several > occasions, but > none of these threads actually deal with the issue. > > Put simply, if you don't put globally-unique-in-space-time > requirements > on your address (GSR in OGSI speak*) then any similar > requirements you > put on an Abstract Name (GSH in OGSI speak) are wasted. > > I believe that answering this issue will help clarify many of > the other > threads (miss) associated with this issue. > > In particular, I believe Frank is right. Therefore, if an EPR > is going > to be a WS-Name, the wsa:Address MUST have the same uniqueness > properties as the Abstract Name. Then if the answer to the question, > "Why do this uniqueness stuff twice?", is "I don't know!", then it > seems logical to me that a WS-Name is a profiled EPR along the lines > proposed by Tom M. > > Thoughts? > > Historical Footnote: > > * Note: OGSI addressed this issue in GSRs by requiring that clients > could detect when the GSRs were stale and that services > reject them if > a client attempted to use them. GSHs had uniqueness > constraints placed > on them. > > -- > > Take care: > > Dr. David Snelling < David . Snelling . UK . Fujitsu . com > > Fujitsu Laboratories of Europe > Hayes Park Central > Hayes End Road > Hayes, Middlesex UB4 8FE > > +44-208-606-4649 (Office) > +44-208-606-4539 (Fax) > +44-7768-807526 (Mobile) > >

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Data architecture requirements on naming
by Dave Berry 23 Nov '05

23 Nov '05

Dear All, Recent discussions on the OGSA data architecture have raised two use cases that may affect the naming discussion. Both involve the mapping of one "abstract" (for some meaning of "abstract") name to multiple possible "concrete" names. A further step is then required to choose the best "concrete" name, according to the policies required by the client. We are wondering whether the WS-Name/EPR resolution services can be modified to support these functionalities. Note: here, "abstract" names may or may not have the same meaning as abstract names in the proposed WS-Names spec. This is an issue that needs clarification. Case 1 is when we are dealing with replicated data. It is common to have an "abstract" name that represents a given file, table or query result that is stored someone in the system. This is then resolved to one of multiple copies. The client typically wants the copy with the best response time (which will be some function of latency and bandwidth). Case 2 is when we are dealing with data stored at a certain location and the data may be accessed by several different protocols (e.g. GridFTP, HTTP, ...). The client (or transfer service) wants to map the "abstract" name to the fastest protocol that it can handle. In each case, we could take one of two approaches: (A) resolve the "abstract" name to a list of "concrete" names, and use a separate selection service to choose among them (B) pass the appropriate policy specification to the resolver service, which will then return the appropriate "concrete" name. Note: (B) could be considered (and even implemented) as a composition of the resolver and selection services in (A). Would it make sense to specify either one of these functionalities as part of the resolver services considered in WS-Naming? E.g. the operations could return a list instead of a single EPR (option A) or they could return a single EPR as now but take a policy argument (option B). Best wishes, Dave Berry Research Manager, National e-Science Centre 15 South College St., Edinburgh Tel: +44 131 6514039

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RE: [ogsa-d-wg] Data architecture requirements on naming
by Hiro Kishimoto 22 Nov '05

22 Nov '05

Peter's email bounced. -- Hiro Kishimoto Subject: RE: [ogsa-d-wg] Data architecture requirements on naming Date: Tue, 22 Nov 2005 13:36:31 +0100 From: "Peter Kunszt" <Peter.Kunszt(a)cern.ch> To: "David Berry" <daveb(a)nesc.ac.uk>, <ogsa-naming-wg(a)ggf.org>, "ogsa-wg" <ogsa-wg(a)gridforum.org>, <ogsa-d-wg(a)gridforum.org> hi dave in our experience, case (B) is not being used by clients. the reason is that the policies that are put in place to find the 'best' concrete replica are very application specific and are usually implemented by the applications themselves. what turned out to be much more useful was to present the list of replicas when asked for it with some measured qualifyers that the grid can provide, i.e. predicted access cost, latency, time to wait (queues) or whatever is available so that the application can resolve the 'best' replica based on any model/policy they may want to apply. it turned out that implementing a generic policy enforcer is very difficult and what you end up doing is to provide a python interpreter so that the applications can write their own policy scripts... hope this helps, cheers, peter >> -----Original Message----- >> From: owner-ogsa-d-wg(a)ggf.org >> [mailto:owner-ogsa-d-wg@ggf.org] On Behalf Of Dave Berry >> Sent: 22 November 2005 11:30 >> To: ogsa-naming-wg(a)ggf.org; ogsa-wg; ogsa-d-wg(a)gridforum.org >> Subject: [ogsa-d-wg] Data architecture requirements on naming >> >> Dear All, >> >> Recent discussions on the OGSA data architecture have raised >> two use cases that may affect the naming discussion. Both >> involve the mapping of one "abstract" (for some meaning of >> "abstract") name to multiple possible "concrete" names. A >> further step is then required to choose the best "concrete" >> name, according to the policies required by the client. We >> are wondering whether the WS-Name/EPR resolution services can >> be modified to support these functionalities. >> >> Note: here, "abstract" names may or may not have the same >> meaning as abstract names in the proposed WS-Names spec. >> This is an issue that needs clarification. >> >> Case 1 is when we are dealing with replicated data. It is >> common to have an "abstract" name that represents a given >> file, table or query result that is stored someone in the >> system. This is then resolved to one of multiple copies. >> The client typically wants the copy with the best response >> time (which will be some function of latency and bandwidth). >> >> Case 2 is when we are dealing with data stored at a certain >> location and the data may be accessed by several different >> protocols (e.g. GridFTP, HTTP, ...). The client (or transfer >> service) wants to map the "abstract" name to the fastest >> protocol that it can handle. >> >> In each case, we could take one of two approaches: >> >> (A) resolve the "abstract" name to a list of "concrete" >> names, and use a separate selection service to choose among them >> >> (B) pass the appropriate policy specification to the resolver >> service, which will then return the appropriate "concrete" name. >> >> Note: (B) could be considered (and even implemented) as a >> composition of the resolver and selection services in (A). >> >> Would it make sense to specify either one of these >> functionalities as part of the resolver services considered >> in WS-Naming? E.g. the operations could return a list >> instead of a single EPR (option A) or they could return a >> single EPR as now but take a policy argument (option B). >> >> Best wishes, >> >> Dave Berry >> Research Manager, National e-Science Centre >> 15 South College St., Edinburgh >> Tel: +44 131 6514039

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