lost downloaded progress when mac crashes

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quinx
Posts: 39
Joined: Mon Dec 27, 2010 12:55 am

lost downloaded progress when mac crashes

Postby quinx » Tue Jan 18, 2011 6:59 pm

transmission had downloaded about 800MB of a 1GB file when my mac froze (graphics card glitch) and i had to do a hard reboot (hold down the power button). when i restarted, transmission lost the 800MB that was already downloaded and only showed about 15MB downloaded.

is there a way to prevent losing download progress in case your mac crashes?
Mac OS X 10.6.7

Rolcol
Posts: 337
Joined: Sun Aug 10, 2008 8:00 am

Re: lost downloaded progress when mac crashes

Postby Rolcol » Tue Jan 18, 2011 7:41 pm

That sounds way too excessive. Transmission has a cache of only 2MiB, so that's about the upper end of the amount of data that could have been lost. Have you tried verifying the data and see if Transmission just forgot the data was there (Transfers > Verify Local Data)?

What if torrent data was in the filesystem cache that the operating system handles on its own?

quinx
Posts: 39
Joined: Mon Dec 27, 2010 12:55 am

Re: lost downloaded progress when mac crashes

Postby quinx » Wed Jan 19, 2011 10:51 pm

i'll try the Verify Local Data if this happens again. all i can tell you is that before the crash the file was mostly downloaded and after rebooting, transmission basically started over from the beginning.

re the torrent data in the OS filesystem cache, i don't know. how would i go about investigating this?
Mac OS X 10.6.7

x190
Posts: 4916
Joined: Sun Nov 30, 2008 4:59 am

Re: lost downloaded progress when mac crashes

Postby x190 » Thu Jan 20, 2011 3:17 am

quinx wrote:
is there a way to prevent losing download progress in case your mac crashes?


Yes! Just get [LAZY]. :)

http://transmission.xpjets.com/
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quinx
Posts: 39
Joined: Mon Dec 27, 2010 12:55 am

Re: lost downloaded progress when mac crashes

Postby quinx » Thu Jan 20, 2011 3:37 am

x190 wrote:Yes! Just get [LAZY]. :)

i don't understand.
Mac OS X 10.6.7

x190
Posts: 4916
Joined: Sun Nov 30, 2008 4:59 am

Re: lost downloaded progress when mac crashes

Postby x190 » Thu Jan 20, 2011 3:53 am

quinx wrote:
x190 wrote:Yes! Just get [LAZY]. :)

i don't understand.


I meant for you to d/l and install the latest nightly which will give you just-in-time verification which should eliminate most data loss in the circumstance you mentioned. Sorry, it was more fun to type "Just get [LAZY]". :)

Use above link or:

https://build.transmissionbt.com/job/trunk-mac/
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quinx
Posts: 39
Joined: Mon Dec 27, 2010 12:55 am

Re: lost downloaded progress when mac crashes

Postby quinx » Sat Feb 12, 2011 7:25 pm

i've updated to 2.20. when the system crashes (or external drive disconnects) while downloading, when i restart transmission it says "Please Verify Local Data! Piece #xxx is corrupt.". so i manually verify local data, and i can literally see the download progress shrink, for example from 70mb to 4mb as it verifies while the progress bar turns a yellow color. then i resume it, having lost 66mb downloaded. so it's still losing most of the download progress when a transfer is interrupted.
Last edited by quinx on Sat Feb 12, 2011 9:30 pm, edited 1 time in total.
Mac OS X 10.6.7

x190
Posts: 4916
Joined: Sun Nov 30, 2008 4:59 am

Re: lost downloaded progress when mac crashes

Postby x190 » Sat Feb 12, 2011 7:45 pm

"Please Verify Local Data! Piece #xxx is corrupt."


How much corrupt data was found? Look in Message Log and Inspector->Activity. Re: external drive disconnect, go to /Volumes on your HD and see if data is there. (Finder->Go->Go to Folder...)
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quinx
Posts: 39
Joined: Mon Dec 27, 2010 12:55 am

Re: lost downloaded progress when mac crashes

Postby quinx » Sat Feb 12, 2011 9:35 pm

i've already completed the download and restarted transmission a few times since, so i don't know how much corrupt data was found. but the data file was always there upon resuming. it's transmission that's losing it's place and can't resume properly without losing 90% of the download progress.

this problem does not occur with utorrent.
Mac OS X 10.6.7


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