Re: [ppsp] New Version Notification for draft-ietf-ppsp-problem-statement-13.txt
Arno Bakker <arno@cs.vu.nl> Wed, 27 February 2013 14:08 UTC
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Date: Wed, 27 Feb 2013 15:08:35 +0100
From: Arno Bakker <arno@cs.vu.nl>
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Subject: Re: [ppsp] New Version Notification for draft-ietf-ppsp-problem-statement-13.txt
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On 26/02/2013 16:31, stefano previdi wrote: > > Please, have a look at the draft: > http://www.ietf.org/internet-drafts/draft-ietf-ppsp-problem-statement-13.txt > > and come back to the list with any comment. > Hi all I have the following comments: * PPSP.OAM.REQ-1: PPSP MUST be sufficiently configurable for installation and initial setup. I don't get the reference to "initial setup" there. I suggest to make the requirement "sufficiently configurable" (which is what we strived for with different chunk addressing, content protection methods) and state that the configuration should allow the proxy-based and end-client scenarios. * PPSP.OAM.REQ-2: PPSP MUST implement a set of configuration parameters with default values. IMHO the descriptive text doesn't add anything and suggest it be removed. * PPSP.OAM.REQ-3: PPSP MUST be capable of controlling traffic load to existing networks. I suggest to rephrase this to "PPSP SHOULD allow steering by network-load management protocols." Current phrasing I find unclear and very restrictive with the MUST clause. * PPSP.OAM.REQ-4: PPSP MUST support diagnostic operations. Typo: "correct operations" -> "correct operation" Typo: "*The* PPSP tracker should" Rephrase: "obtained chunks in due time" -> "whether it obtained chunks in time". * PPSP.OAM.REQ-5: PPSP MUST facilitate achieving quality acceptable to streaming application. I have problems with the last paragraph about scalable streaming. To me, it suggests scalable streaming should be supported. I suggest to rephrase to "PPSP implementations MAY use techniques such as scalable streaming to handle bandwidth shortages without disrupting playback." Typo: "to streaming application" -> "to *the* streaming ..." * PPSP.OAM.REQ-6: PPSP MUST support remote management using centralized server, i.e. PPSP tracker. A basic set of management information MUST be implemented by PPSP tracker. The wording suggests a centralized design where all management operations are done via the tracker. This image is not correct IMHO. A tracker service can play an important role in managing a swarm. E.g. it can be used to control publication of a swarm, or to monitor the health of the swarm. Hence it should have a standard management interface that supports such functionality. This interface should take into account that the tracker *service* may be implemented by multiple *servers*. However, PPSP should also support tracker-less designs and should define a management interface for (farms of) PPSP seeders. I suggest to rephrase the requirement so that the tracker service and PPSP seeders should have a remote management interface. Current descriptive text should be tweaked to explain the unique position of the tracker (sees both clients and PPSP seeders). * PPSP.OAM.REQ-9: PPSP MUST support accounting management when content provider wants to charge clients for certain content. I suggest to change the "MUST" to a "MAY" or "SHOULD allow accounting management". CU, Arno
- [ppsp] Fw: New Version Notification for draft-iet… zhangyunfei
- Re: [ppsp] Fw: New Version Notification for draft… Martin Stiemerling
- Re: [ppsp] New Version Notification for draft-iet… stefano previdi
- Re: [ppsp] New Version Notification for draft-iet… Arno Bakker
- Re: [ppsp] New Version Notification for draft-iet… zhangyunfei