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Bug 323406

Summary:	JGit does not properly do 'thin' transfers over SSH
Product:	[Technology] JGit	Reporter:	cliff
Component:	JGit	Assignee:	Project Inbox <jgit.core-inbox>
Status:	RESOLVED FIXED	QA Contact:
Severity:	major
Priority:	P3	CC:	caniszczyk, cliff, sop, stefan.lay
Version:	0.8.1
Target Milestone:	0.11
Hardware:	Macintosh
OS:	Mac OS X - Carbon (unsup.)
Whiteboard:

Description cliff

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

2010-08-23 12:19:39 EDT

This was with the 0.8.4 release.

Comment 2 Shawn Pearce

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.