|author||Kaushik Lingarkar <firstname.lastname@example.org>||Wed May 12 16:12:27 2021 -0700|
|committer||Kaushik Lingarkar <email@example.com>||Mon May 24 13:00:54 2021 -0700|
BatchRefUpdate: Skip saving conflicting ref names and prefixes in memory Rather than getting all ref names and prefixes and saving them in memory to perform the check for conflicting names, rely on RefDirectory.isNameConflicting as it is no longer an expensive call after it was optimized in Ie994fc. The old optimization to save ref names and prefixes in memory was targeted towards making clones faster. With this change, the clone performance is unaffected when tests were done with repos containing many(~500k) refs. Here are few recorded elapsed times for creating 10 branches using BatchRefUpdate on NFS based repositories with varying loose refs count. As seen here, this change helps improve the BatchRefUpdate performance from O(n^2) to O(1). loose_refs_count with_change without_change 50 241 ms 310 ms 300 263 ms 1502 ms 1k 181 ms 4241 ms 2k 204 ms 6440 ms 9k 158 ms 25930 ms 20k 154 ms 60443 ms 50k 171 ms 135199 ms 110k 157 ms 329450 ms 160k 209 ms 396328 ms This update improves the Gerrit notedb migration performance as it uses BatchRefUpdate to write change meta refs similar to the test performed above. Change-Id: I853ac6c7feb4b39c3156c01876b38cbd182accfe Signed-off-by: Kaushik Lingarkar <firstname.lastname@example.org>
An implementation of the Git version control system in pure Java.
This package is licensed under the EDL (Eclipse Distribution License).
JGit can be imported straight into Eclipse, built and tested from there, but the automated builds use Maven.
A pure Java library capable of being run standalone, with no additional support libraries. It provides classes to read and write a Git repository and operate on a working directory.
All portions of JGit are covered by the EDL. Absolutely no GPL, LGPL or EPL contributions are accepted within this package.
Ant tasks based on JGit.
Support for exporting to various archive formats (zip etc).
Apache httpclient support
Server for the smart and dumb Git HTTP protocol.
Command-line interface Git commands implemented using JGit ("pgm" stands for program).
Production of Eclipse features and p2 repository for JGit. See the JGit Wiki on why and how to use this module.
Helpers for unit testing
Unit tests for org.eclipse.jgit
No further description needed
Native smbolic links are supported, provided the file system supports them. For Windows you must have Windows Vista/Windows 2008 or newer, use a non-administrator account and have the SeCreateSymbolicLinkPrivilege.
Only the timestamp of the index is used by jgit if the index is dirty.
JGit requires at least a Java 8 JDK.
CRLF conversion is performed depending on the core.autocrlf setting, however Git for Windows by default stores that setting during installation in the "system wide" configuration file. If Git is not installed, use the global or repository configuration for the core.autocrlf setting.
The system wide configuration file is located relative to where C Git is installed. Make sure Git can be found via the PATH environment variable. When installing Git for Windows check the "Run Git from the Windows Command Prompt" option. There are other options like Eclipse settings that can be used for pointing out where C Git is installed. Modifying PATH is the recommended option if C Git is installed.
We try to use the same notation of $HOME as C Git does. On Windows this is often not the same value as the user.home system property.
Read loose and packed commits, trees, blobs, including deltafied objects.
Read objects from shared repositories
Write loose commits, trees, blobs.
Write blobs from local files or Java InputStreams.
Read blobs as Java InputStreams.
Copy trees to local directory, or local directory to a tree.
Lazily loads objects as necessary.
Read and write .git/config files.
Create a new repository.
Read and write refs, including walking through symrefs.
Read, update and write the Git index.
Checkout in dirty working directory if trivial.
Walk the history from a given set of commits looking for commits introducing changes in files under a specified path.
Object transport Fetch via ssh, git, http, Amazon S3 and bundles. Push via ssh, git and Amazon S3. JGit does not yet deltify the pushed packs so they may be a lot larger than C Git packs.
And much more
There are some missing features:
Post question, comments or patches to the email@example.com mailing list. You need to be subscribed to post, see here:
See the EGit Contributor Guide:
More information about Git, its repository format, and the canonical C based implementation can be obtained from the Git website: