Progress display prints spurious newlines

[Matt Zimmerman]

Binary package hint: zsync

This example comes from an Ubuntu DVD zsync session:

########------------ 43.5% 8.7 kBps
########------------ 43.5% 15.9 kBps
########------------ 43.5% 18.6 kBps
########------------ 43.5% 3.7 kBps ETA
########------------ 43.5% 7.2 kBps
########------------ 43.5% 17.4 kBps
########------------ 43.5% 8.7 kBps ETA
########------------ 43.5% 8.7 kBps ETA
########------------ 43.5% 5.3 kBps ETA
########------------ 43.5% 31.9 kBps TA
########------------ 43.5% 31.9 kBps ETA
########------------ 43.5% 9.2 kBps ETA
########------------ 43.5% 17.1 kBps
########------------ 43.5% 24.9 kBps TA
########------------ 43.6% 32.1 kBps TA
########------------ 43.6% 33.3 kBps
########------------ 43.6% 16.2 kBps TA
########------------ 43.6% 15.9 kBps
########------------ 43.6% 23.4 kBps ETA
########------------ 43.6% 24.6 kBps
########------------ 43.6% 24.6 kBps
########------------ 43.6% 20.3 kBps TA
########------------ 43.6% 31.9 kBps TA
########------------ 43.6% 8.4 kBps ETA
########------------ 43.6% 31.9 kBps TA
########------------ 43.6% 16.5 kBps TA
########------------ 43.6% 33.3 kBps TA
########------------ 43.6% 17.4 kBps TA
########------------ 43.6% 31.9 kBps TA
########------------ 43.6% 17.1 kBps
########------------ 43.7% 24.9 kBps ETA
########------------ 43.7% 15.9 kBps TA
########------------ 43.7% 24.6 kBps
########------------ 43.7% 15.9 kBps
########------------ 43.7% 32.6 kBps
########------------ 43.7% 17.4 kBps
########------------ 43.7% 33.3 kBps TA
########------------ 43.7% 13.5 kBps TA
########------------ 43.7% 24.6 kBps
########------------ 43.7% 49.2 kBps 804:02 ETA

ProblemType: Bug
Architecture: amd64
Date: Thu Oct 22 11:35:25 2009
DistroRelease: Ubuntu 9.10
Package: zsync 0.6-1ubuntu2
ProcEnviron:
 LC_COLLATE=C
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: zsync
Uname: Linux 2.6.31-14-generic x86_64

[psl (slansky)]

Ubuntu 9.10, i386, zsync 0.6

# zsync -V
zsync v0.6 (compiled Nov 6 2009 05:52:12)
By Colin Phipps <email address hidden>
Published under the Artistic License v2, see the COPYING file for details.

I can replicate the issue, download is slow, when I download from http://releases.ubuntu.com/9.10/ubuntu-9.10-desktop-amd64.iso.zsync

# zsync http://releases.ubuntu.com/9.10/ubuntu-9.10-desktop-amd64.iso.zsync
#################### 100.0% 0.0 kBps DONE

reading seed file ubuntu-9.10-desktop-amd64.iso.part: **************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read ubuntu-9.10-desktop-amd64.iso.part. Target 7.2% complete.
downloading from http://releases.ubuntu.com/9.10/ubuntu-9.10-desktop-amd64.iso:
#------------------- 7.2% 4.5 kBps ETA
#------------------- 7.2% 0.6 kBps
#------------------- 7.2% 8.5 kBps ETA
#------------------- 7.3% 2.8 kBps ETA
#------------------- 7.3% 1.7 kBps ETA
#------------------- 7.4% 2.8 kBps ETA
#------------------- 7.4% 8.5 kBps ETA
#------------------- 7.4% 1.4 kBps
#------------------- 7.4% 2.8 kBps ETA

Interesting point I would like to highlight is that when I download the same file from other mirror (like http://releases.ubuntu.mirror.dkm.cz/releases/9.10/ubuntu-9.10-desktop-amd64.iso.zsync), I don't see this problem.

# zsync http://releases.ubuntu.mirror.dkm.cz/releases/9.10/ubuntu-9.10-desktop-amd64.iso.zsync
#################### 100.0% 0.0 kBps DONE

reading seed file ubuntu-9.10-desktop-amd64.iso.part: **************************************************************************************************************************************************************************************************************************************************************************************************************************************************Read ubuntu-9.10-desktop-amd64.iso.part. Target 66.6% complete.
downloading from http://releases.ubuntu.mirror.dkm.cz/releases/9.10/ubuntu-9.10-desktop-amd64.iso:
##############------ 71.6% 648.1 kBps 5:17 ETA

[psl (slansky)]

I can replicate the issue at my local LAN too. It is related to heavy traffic or packet lost/retransmissions. In this example, I started download in time when other process was using my server. When image was at 4.5%, server resources were free and zsync was downloading fast till it get 55% of the image; in that time other process put heavy load to the server and zsync has the problem again. Observed with zsync 0.5 at U9.04 amd64:

$ zsync http://server/zsync/ubuntu-9.04-dvd-i386.iso.zsync
#################### 100.0% 1028.7 kBps DONE

No relevent local data found - I will be downloading the whole file. If that's not what you want, CTRL-C out. You should specify the local file is the old version of the file to download with -i (you might have to decompress it with gzip -d first). Or perhaps you just have no data that helps download the file
downloading from http://server/zsync/ubuntu-9.04-dvd-i386.iso:
-------------------- 0.0% 12.5 kBps
-------------------- 1.8% 10.9 kBps ETA
-------------------- 1.8% 42.1 kBps
-------------------- 1.8% 3.2 kBps ETA
-------------------- 1.9% 68.1 kBps
-------------------- 1.9% 24.6 kBps ETA
-------------------- 1.9% 28.1 kBps
-------------------- 1.9% 16.4 kBps
-------------------- 2.5% 32.8 kBps ETA
-------------------- 3.9% 49.2 kBps ETA
-------------------- 4.5% 67.7 kBps TA
###########--------- 55.2% 3.6 kBps ETA
###########--------- 55.2% 10.9 kBps
###########--------- 55.9% 30.9 kBps TA
###########--------- 56.1% 3.0 kBps ETA

[Steve Beattie (sbeattie)]

Yes, I also see this behavior when the download has slowed or stalled.

[Stefan K. (archilles)]

This still happens at least until xenial.