Well, from my tests, if I query the length of SDK file from the mirror with "Content_Length" it doesn't work, if I do that with another file on another server, it works, so, I suppose it uses Transfer-Encoding, so, I can't query the size first, do you know what are the steps to use it (how it works) ? (I would like to try it before we say, it is not for us)
Thanks, -Fred -----Message d'origine----- De : omup...@gmail.com [mailto:omup...@gmail.com] De la part de OmPrakash Muppirala Envoyé : jeudi 5 septembre 2013 00:43 À : dev@flex.apache.org Objet : Re: [Intaller] Speed up download On Wed, Sep 4, 2013 at 3:31 PM, Frédéric THOMAS <webdoubl...@hotmail.com>wrote: > What I want to try is chunks downloads with one file per worker and > compute > md5 in workers too to go as fast as possible to the next install step, > I've got a slow bandwidth but when I use my IDM, I download twice faster. > > If we want to be smart, I guess we can improve the algorithm having > one chunk per mirror, quickly check the speed, and retain the 4 fasters. > I see a couple of problems with this approach. 1. Every mirror needs to support the "Transfer-Encoding" (chunked) header vs. the "Content-Length" header. I dont think there is any way to ensure that all the mirrors support this. 2. If you get one chunk per mirror and if one of the mirrors has a corrupted artifact, then it will be almost impossible to figure out and track where the MD5 checksum. 3. In the past, I have run into a very rare problem with Flash runtime not being able to receive a chunk received notification on Macs on Wireless. I know this is a specific scenario, but not that uncommon. That bug might have been fixed now, though. I think computing MD5 in a worker thread might be a good investment of our time since we know for sure that it would benefit us. I am not so sure about the chunked transfers approach. Thanks, Om > > Well, I'm not there yet, at the moment I'm playing with URLStream and > URLRequestHeader to check is possible or not. > > Any thoughts or experiences using those 2 classes with Ranges headers ? > > -----Message d'origine----- > De : Alex Harui [mailto:aha...@adobe.com] Envoyé : jeudi 5 septembre > 2013 00:14 À : dev@flex.apache.org Objet : Re: [Intaller] Speed up > download > > > > On 9/4/13 2:54 PM, "Nicholas Kwiatkowski" <nicho...@spoon.as> wrote: > > >We can't. We have to rely on the Apache system to determine the > >download mirror. We are locked into that method. > I know we have to use mirrors, but are you sure we can't use a > different algorithm? > > -Alex > >
