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Bug 323406 - JGit does not properly do 'thin' transfers over SSH
Summary: JGit does not properly do 'thin' transfers over SSH
Status: RESOLVED FIXED
Alias: None
Product: JGit
Classification: Technology
Component: JGit (show other bugs)
Version: 0.8.1   Edit
Hardware: Macintosh Mac OS X - Carbon (unsup.)
: P3 major (vote)
Target Milestone: 0.11   Edit
Assignee: Project Inbox CLA
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Reported: 2010-08-23 12:18 EDT by cliff CLA
Modified: 2011-02-04 08:40 EST (History)
4 users (show)

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Description cliff CLA 2010-08-23 12:18:45 EDT 
Build Identifier: Command line jgit

Using the --thin option doesn't work. Changing 1 byte in a 10 MB file results in all 10 MB being pushed again using SSH protocol.


Reproducible: Always

Steps to Reproduce:
1. Add / commit 10 MB file to local repository
2. Use JGit with --thin to push to remote via SSH (JGit takes several seconds)
3. Use hex editor to change 1 byte at the beginning of 10 MB file
4. Commit to local repository
5. Use JGit with --thin to push to remote via SSH (JGit still takes several seconds)

Bandwidth monitor shows 10 MB being transferred in step 4. With C git, only 462 bytes are transferred.
Comment 1 cliff CLA 2010-08-23 12:19:39 EDT 
This was with the 0.8.4 release.
Comment 2 Shawn Pearce CLA 2011-02-04 08:40:40 EST 
I'm pretty sure this is fixed in commit 13bcf05a9ea2d4943faef2c879aac65d37517eb6, which will be in 0.11.  The thin pack generation didn't construct the delta bases into the delta window correctly, missing a lot of opportunities for delta compression.