[tahoe-dev] [tahoe-lafs] #605: two-hour delay to connect to a grid from Win32, if there are many storage servers unreachable

[tahoe-lafs]

#605: two-hour delay to connect to a grid from Win32, if there are many storage
servers unreachable
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     Reporter:  zooko         |       Owner:  zooko                                
         Type:  defect        |      Status:  assigned                             
     Priority:  major         |   Milestone:  eventually                           
    Component:  code-network  |     Version:  1.2.0                                
   Resolution:                |    Keywords:  windows performance hang introduction
Launchpad Bug:                |  
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Comment (by zooko):

 #448 is fixed. I looked in the code and this issue #605 is still going to
 be unchanged by #448 being fixed because the storage client starts
 attempting to connect to each storage server as soon as it learns about
 the server: [source:trunk/src/allmydata/storage_client.py at 4131#L102]. One
 way to improve the behavior of the client with regard to this ticket would
 be to make that call to {{{start_connection()}}} be invoked lazily, only
 when the client actually wanted to send a message to that particular
 server. However, this would harm alacrity—it would move TCP and foolscap
 handshaking from introduction time to request time and thus increase the
 delay between making the request and receiving the response (for the first
 request made to each server). I don't think that is  a good trade-off.

 That means this ticket is going to stay open until we implement something
 more along the lines of comment:14—a way for clients to get hints that
 certain servers are currently off-line without attempting to open a TCP
 connection to those servers. Oh, also something that might help with this
 would be μTP (#1179).

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Ticket URL: <http://tahoe-lafs.org/trac/tahoe-lafs/ticket/605#comment:19>
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