Hi all,
I do some testings on rsync by using the following method:
1- rsyning the following file with rsync:
rsync rsync://ftp.cn.debian.org/debian/dists/Debian7.8/main/binary-all/
Packages.bz2 .
2- Then I split the file into little files with the file size equaling to
128K, which is the maximum of the block-size accepted by rsync.
split -b 128K Packages.bz2
And at this point, I obtained the following 20 files:
werner at debian:~/http_resume_test$ ls x*
xaa xac xae xag xai xak xam xao xaq xas
xab xad xaf xah xaj xal xan xap xar xat
Then I delete some files, say, xab and xae, from the above little
files, and then use the cat tool to regenerate the Packages.bz2 by only
using the remaining little files:
werner at debian:~/http_resume_test$ for i in `ls x*`; do cat $i >>
Packages.bz2; done
3- Then, I re-run rsync with the following commands to syncing on the
above re-generated Packages.bz2 file for testing:
$ rsync -v -B131072 --append rsync://ftp.cn.debian.org/debian/dists/
Debian7.8/main/binary-all/Packages.bz2 .
[snip]
Packages.bz2
sent 47 bytes received 577,028 bytes 230,830.00 bytes/sec
total size is 2,541,616 speedup is 4.40
$ rsync -v -B131072 --append-verify rsync://ftp.cn.debian.org/debian/
dists/Debian7.8/main/binary-all/Packages.bz2 .
[snip]
sent 28 bytes received 1,381 bytes 563.60 bytes/sec
total size is 2,541,616 speedup is 1,803.84
4- Finally, I use diff to see the differences between the original
Packages.bz2 file the the one generated by the above two rsyncing runnings
with --append and --append-verify options.
Note, in the following command, the ~/Packages.bz2 is the original
Packages.bz2 file directly obtained from http://ftp.cn.debian.org/debian/
dists/Debian7.8/main/binary-all/Packages.bz2.
werner at debian:~/http_resume_test$ diff Packages.bz2 ~/Packages.bz2
Binary files Packages.bz2 and /home/werner/Packages.bz2 differ
As you can see, the finally file obtained by --append then --append-
verify is a wrong file which is differ from the original one.
5- In the above test, if I only running the following command to re-
rsyncing on the re-gererated Packages.bz2:
$ rsync -v -B131072 --append-verify rsync://ftp.cn.debian.org/debian/
dists/Debian7.8/main/binary-all/Packages.bz2 .
The result file will be correct, see following for detail:
werner at debian:~/http_resume_test$ diff Packages.bz2 ~/Packages.bz2
werner at debian:~/http_resume_test$
Any hints on this issue?
Regards
--
Hongyi Zhao <hongyi.zhao at gmail.com>
Xinjiang Technical Institute of Physics and Chemistry
Chinese Academy of Sciences
GnuPG DSA: 0xD108493
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