Vanilla TCP Alasdair Allan IVOA Interop Meeting May
VOEvent" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-13.jpg" alt="12 RSS feed <? xml version="1. 0" ? > <rss version="2. 0"> <channel> <title>VOEvent" /></div>
<div class="item"><img class="lazyOwl imgdescription" title="13 RSS feeds e. STAR native feed (includes OGLE III feed) http: //www. estar." src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-14.jpg" alt="13 RSS feeds e. STAR native feed (includes OGLE III feed) http: //www. estar." /></div>
<div class="item"><img class="lazyOwl imgdescription" title="14 Where are we going? • Event brokering (aggregators) – time critical – non-time" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-15.jpg" alt="14 Where are we going? • Event brokering (aggregators) – time critical – non-time" /></div>
<div class="item"><img class="lazyOwl imgdescription" title="15 We should not mandate transport! • We should not tie our document or" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-16.jpg" alt="15 We should not mandate transport! • We should not tie our document or" /></div>
<div class="item"><img class="lazyOwl imgdescription" title="16 Cathedral and the Bazaar • Design by committee – cathedrals – slums •" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-17.jpg" alt="16 Cathedral and the Bazaar • Design by committee – cathedrals – slums •" /></div>
<div class="item"><img class="lazyOwl imgdescription" title="17 Conclusions • Probably need a backbone protocol • Probably going to be TCP(V)" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-18.jpg" alt="17 Conclusions • Probably need a backbone protocol • Probably going to be TCP(V)" /></div>
<div class="item"><img class="lazyOwl imgdescription" title="18 The 2 nd HTN Workshop July 23 -26, 2006 in the Institut für" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-19.jpg" alt="18 The 2 nd HTN Workshop July 23 -26, 2006 in the Institut für" /></div>
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<ul>
<li>Количество слайдов: 19</li>
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<div class="slidedescription">
<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="Vanilla TCP? Alasdair Allan IVOA Interop Meeting, May 2006 " src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-1.jpg" alt="Vanilla TCP? Alasdair Allan IVOA Interop Meeting, May 2006 " />
Vanilla TCP? Alasdair Allan IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="1 Why TCP? • Traditional and still the best • Because we’ve always done" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-2.jpg" alt="1 Why TCP? • Traditional and still the best • Because we’ve always done" />
1 Why TCP? • Traditional and still the best • Because we’ve always done it that way – not always a bad thing – everyone knows how • Minimum buy-in for users • Minimum buy-in for publishers • Fast, little if any overhead IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="2 User buy-in… • 92 lines of Perl, including; – ACK messages – IAMALIVE" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-3.jpg" alt="2 User buy-in… • 92 lines of Perl, including; – ACK messages – IAMALIVE" />
2 User buy-in… • 92 lines of Perl, including; – ACK messages – IAMALIVE messages – error handling – re-connection – message parsing IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="3 Publisher buy-in… • 130 lines of Perl, including; – ACK messages – IAMALIVE" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-4.jpg" alt="3 Publisher buy-in… • 130 lines of Perl, including; – ACK messages – IAMALIVE" />
3 Publisher buy-in… • 130 lines of Perl, including; – ACK messages – IAMALIVE messages – error handling – re-connection – multiple clients IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="4 What we’ve done so far? • Convenience layer and parser (Perl, C++ &" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-5.jpg" alt="4 What we’ve done so far? • Convenience layer and parser (Perl, C++ &" />
4 What we’ve done so far? • Convenience layer and parser (Perl, C++ & Java? ) – building common cases (including GCN) – http: //voevent. sourceforge. net/ • Prototype event network live and on sky • Limited (hard-wired logic) brokering – using <What> • Archiving and persistent storage • RSS test feed(s) – programmatic – human readable? IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="5 TCP(V) prototypes • VOEvent over “vanilla” TCP/IP • Acknowledgement of passed message •" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-6.jpg" alt="5 TCP(V) prototypes • VOEvent over “vanilla” TCP/IP • Acknowledgement of passed message •" />
5 TCP(V) prototypes • VOEvent over “vanilla” TCP/IP • Acknowledgement of passed message • Basic health checks on the endpoints IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="6 “Atomic” services • • • Author Publisher Relay Repository Subscriber Listener An architecture" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-7.jpg" alt="6 “Atomic” services • • • Author Publisher Relay Repository Subscriber Listener An architecture" />
6 “Atomic” services • • • Author Publisher Relay Repository Subscriber Listener An architecture diagram showing; publishers, subscribers, filters (e. g. relays) and repositories, along with the more complicated aggregators and brokers. IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="7 TCP(V) client/server • Subscriber (client) opens a socket connection to a a Publisher" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-8.jpg" alt="7 TCP(V) client/server • Subscriber (client) opens a socket connection to a a Publisher" />
7 TCP(V) client/server • Subscriber (client) opens a socket connection to a a Publisher (server) and listens for events on that port. • Subscriber (client) will send an acknowledgement to the Publisher (server) on receipt of an event. • Publisher (server) will periodically send an “iamalive” packet to all Subscribers (clients). • Subscribers (clients) will reply with an “iamalive”. IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="8 Event flow Publishers #### <VOEvent role=“observation”>. . ####. <VOEvent role=“ack”> </VOEvent>. . ." src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-9.jpg" alt="8 Event flow Publishers #### <VOEvent role=“observation”>. . ####. <VOEvent role=“ack”> </VOEvent>. . ." />
8 Event flow Publishers #### <VOEvent role=“observation”>. . ####. <VOEvent role=“ack”> </VOEvent>. . . </VOEvent> Broker Subscriber s Repository IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="9 VOEvent Network Microlensing Survey SWIFT etc Exeter Data Mining Exeter GCN NASA GSFC" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-10.jpg" alt="9 VOEvent Network Microlensing Survey SWIFT etc Exeter Data Mining Exeter GCN NASA GSFC" />
9 VOEvent Network Microlensing Survey SWIFT etc Exeter Data Mining Exeter GCN NASA GSFC SDSS SNe Super. Nova Survey GCN-2 Exeter NASA GSFC U Wash/Stanford Liverpool Telescope La Palma Backbone Palomar-Quest Caltech Exeter OGLE III Las Campanas Caltech Faulkes South Australia Faulkes North LANL NOAO Palomar P 60 Hawaii ULTRACAM La Palma JAC Caltech Hawaii Pairitel Berkeley Surveys Tools/Services CTIO/KPNO Community Key Roles Publisher Filter Repository Sky. DOT RAPTOR x 8 (database) LANL Author Subscriber UKIRT Hawaii Event Flow IVOA Interop Meeting, May 2006 VOEvent Other </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="10 Alternative transport • RSS 2. 0 • e. STAR – SOAP – Plastic" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-11.jpg" alt="10 Alternative transport • RSS 2. 0 • e. STAR – SOAP – Plastic" />
10 Alternative transport • RSS 2. 0 • e. STAR – SOAP – Plastic (over XMLRPC) • Caltech – Jabber/XMPP • NOAO – Java Messaging – Mule IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="11 RSS 2. 0 • Parallel (on the side? ) development to TCP(V) •" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-12.jpg" alt="11 RSS 2. 0 • Parallel (on the side? ) development to TCP(V) •" />
11 RSS 2. 0 • Parallel (on the side? ) development to TCP(V) • The vanilla of the Web 2. 0 era • What RSS is not, – a transport layer – a protocol for document exchange • It’s “just” a document format – envelope for VOEvent IVOA Interop Meeting, May 2006 </p>
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<div style="width: auto;" class="description columns twelve"><p><img class="imgdescription" title="12 RSS feed <? xml version="1. 0" ? > <rss version="2. 0"> <channel> <title>VOEvent" src="https://present5.com/presentation/b4df8cd7e2af48b060e0c8aa486a736c/image-13.jpg" alt="12 RSS feed <? xml version="1. 0" ? > <rss version="2. 0"> <channel> <title>VOEvent" />
12 RSS feed <? xml version="1. 0" ? > <rss version="2. 0"> <channel> <title>VOEvent GCN NoticesenRSS feed for GCN notices http: //voeventnet. caltech. edu/GCN. html MILAGRO_Source trigger 886 -1
Possible GRB The event time is 2005 -12 -01 T 16: 24: 15 UT. Location RA 232. 1248 Dec 62. 9797 (J 2000)
Fri, 02 Dec 2005 16: 09: 52 PST http: //voeventnet. caltech. edu/Notices/ivo_GCN_MILAGRO_58_886 -1_2005 -12 -01 T 16: 24: 15. xml Scott Barthelmy GCN scott@milkyway. gsfc. nasa. govhttp: //gcn. gsfc. nasa. gov/gcn 3_archive. html. . . IVOA Interop Meeting, May 2006
13 RSS feeds e. STAR native feed (includes OGLE III feed) http: //www. estar. org. uk/voevent/e. STAR. rdf RAPTOR/TALONS feed (includes GCN translation) http: //www. estar. org. uk/voevent/RAPTOR. rdf Caltech feed (re-published GCN translation) http: //www. estar. org. uk/voevent/Caltech. rdf See the e. STAR website http: //www. estar. org. uk/ for more information. IVOA Interop Meeting, May 2006
14 Where are we going? • Event brokering (aggregators) – time critical – non-time critical (data mining? ) • Event archiving and persistent storage – REST (and SOAP) interfaces – persistence of data products • Search service – REST interface • Authentication – signatures IVOA Interop Meeting, May 2006
15 We should not mandate transport! • We should not tie our document or protocol standards to a single mode of transport; – bad design decision – RFC 1149, see http: //www. blug. linux. no/rfc 1149/ – longer term problems IVOA Interop Meeting, May 2006
16 Cathedral and the Bazaar • Design by committee – cathedrals – slums • Design by dictate – lottery • Design by market pressure – betamax vs. VHS – market pressure IVOA Interop Meeting, May 2006
17 Conclusions • Probably need a backbone protocol • Probably going to be TCP(V) – low buy-in for both publishers and subscribers – fully supported across different platforms – momentum is in that direction • But other transport mechanisms are needed IVOA Interop Meeting, May 2006
18 The 2 nd HTN Workshop July 23 -26, 2006 in the Institut für Astrophysik, Göttingen, Germany Aims • Establish the standards for interoperability between robotic telescope networks. • Work towards the establishment of an e-market for the exchange of telescope time. • Establish the standards for interoperability with the Virtual Observatory (VO) for event notification. See http: //www. telescope-networks. org/ for details. IVOA Interop Meeting, May 2006
13 RSS feeds e. STAR native feed (includes OGLE III feed) http: //www. estar. org. uk/voevent/e. STAR. rdf RAPTOR/TALONS feed (includes GCN translation) http: //www. estar. org. uk/voevent/RAPTOR. rdf Caltech feed (re-published GCN translation) http: //www. estar. org. uk/voevent/Caltech. rdf See the e. STAR website http: //www. estar. org. uk/ for more information. IVOA Interop Meeting, May 2006 
14 Where are we going? • Event brokering (aggregators) – time critical – non-time critical (data mining? ) • Event archiving and persistent storage – REST (and SOAP) interfaces – persistence of data products • Search service – REST interface • Authentication – signatures IVOA Interop Meeting, May 2006 
15 We should not mandate transport! • We should not tie our document or protocol standards to a single mode of transport; – bad design decision – RFC 1149, see http: //www. blug. linux. no/rfc 1149/ – longer term problems IVOA Interop Meeting, May 2006 
16 Cathedral and the Bazaar • Design by committee – cathedrals – slums • Design by dictate – lottery • Design by market pressure – betamax vs. VHS – market pressure IVOA Interop Meeting, May 2006 
17 Conclusions • Probably need a backbone protocol • Probably going to be TCP(V) – low buy-in for both publishers and subscribers – fully supported across different platforms – momentum is in that direction • But other transport mechanisms are needed IVOA Interop Meeting, May 2006 
18 The 2 nd HTN Workshop July 23 -26, 2006 in the Institut für Astrophysik, Göttingen, Germany Aims • Establish the standards for interoperability between robotic telescope networks. • Work towards the establishment of an e-market for the exchange of telescope time. • Establish the standards for interoperability with the Virtual Observatory (VO) for event notification. See http: //www. telescope-networks. org/ for details. IVOA Interop Meeting, May 2006