[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Mldonkey-bugs] [Bug #1722] file gets downloaded more than 100% - false
From: |
nobody |
Subject: |
[Mldonkey-bugs] [Bug #1722] file gets downloaded more than 100% - false chunks received |
Date: |
Sun, 17 Nov 2002 10:17:36 -0500 |
=================== BUG #1722: LATEST MODIFICATIONS ==================
http://savannah.nongnu.org/bugs/?func=detailbug&bug_id=1722&group_id=1409
Changes by: Anonymous user Date: 2002-Nov-17 10:17
------------------ Additional Follow-up Comments ----------------------------
I tried downloading this file (giving the whole ed2k URL wasn't very wise; next
time, if you really need to, only give MD4 hash and size, it's enough)
Download went to 101.6% or so, and the file completed normally, without my
intervention...
=================== BUG #1722: FULL BUG SNAPSHOT ===================
Submitted by: Loial Project: mldonkey, a free e-Donkey
client
Submitted on: 2002-Nov-15 09:14
Category: Core Severity: 5 - Major
Bug Group: None Resolution: None
Assigned to: None Status: Open
Release: 2.00 Release:
Platform Version: Linux i386-i686 Binaries Origin: Compiled From CVS
Summary: file gets downloaded more than 100% - false chunks received
Original Submission: I'm having difficulty downloading some files correctly
because I download more than 100% of the file.
This is what I think happens:
I download a file,
e.g.ed2k://|file|Need_For_Speed_Hot_Pursuit_2.DEVIANCE.ShareReactor.bin|739678128|CEDEDC2F223B6FC7A9B0AC651A686FBD|/
but someone seems to have some incorrect chunks, because the downloaded size is
bigger than the original file size. Pressing 'Verify chunks' removes the
incorrect data en leaves me with a file that is e.g. 95% downloaded. This is
good. However the incorrect chunks are downloaded again, so I again have a file
that is not correct and I have to press 'Verify chunks' again. This keeps
repeating itself.
The problem is, I think, that the incorrect chunk is downloaded from the same
user(s) again. It would be better though if the username is remembered as
having that incorrect part, so the part is downloaded from someone else.
Problem might be that during transmission of the original correct chunk the
data got corrupted, resulting in the now incorrect chunk and then it would not
be wise to remember that user as having an incorrect chunk. Or is this no
problem, because it is already taken care of by the transmission protocol?
It can be said that there isn't a real problem here, because eventually the
missing part will be downloaded from someone else and then the chunk will be
correct and the file will be finished. However at the moment I am downloading
at 100kb/s for half a day already and I still only have the same 90% of the
file that I had this morning. This is ofcourse a big waste of network bandwith
and should therefor be prevented.
I hope I could make myself clear :)
Goodluck and thanx
Follow-up Comments
*******************
-------------------------------------------------------
Date: 2002-Nov-17 10:17 By: None
I tried downloading this file (giving the whole ed2k URL wasn't very wise; next
time, if you really need to, only give MD4 hash and size, it's enough)
Download went to 101.6% or so, and the file completed normally, without my
intervention...
-------------------------------------------------------
Date: 2002-Nov-16 15:11 By: None
IP packets are checksummed, so corruption during transfer should be detected;
But they're other sources of corruption (disk, memory,... of a peer)
The problem is that a given chunk doesn't usually come from just one source,
but from several sources, so mldonkey would have to keep a list of involved
sources for each chunk...
Another solution would be to implement the eMule's ICH protocol extension (or a
similar extension).
CC list is empty
No files currently attached
For detailed info, follow this link:
http://savannah.nongnu.org/bugs/?func=detailbug&bug_id=1722&group_id=1409