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Kaushik Lingarkar 5606a53151 FileSnapshot: Lazy load file store attributes cache 
Doing a getFileStoreAttributes call even when the file doesn't
exist is unnecessary. This call is particularly slow on some
filesystems. Instead, do it only when the file exists and load
the appropriate cache.

This update can help speed up RefDirectory.exactRef when the ref
is packed, but has a corresponding empty dir for it under 'refs/'.
This scenario can happen when an atomic 'BatchRefUpdate' creates
new sharded refs.

For example, consider the case where we create 50k sharded refs in
a new namespace called 'new-refs' using an atomic 'BatchRefUpdate'.
The refs are named like 'refs/new-refs/01/1/1', 'refs/new-refs/01/1/2',
'refs/new-refs/01/1/3' and so on. After the refs are created, the
'new-refs' namespace looks like below:

$ find refs/new-refs -type f | wc -l
0

$ find refs/new-refs -type d | wc -l
5101

At this point, an 'exactRef' call on each of the 50k refs without
this change takes ~30s, where as with this change it takes ~2.5s.

Change-Id: I4a5d4c6a652dbeed1f4bc3b4f2b2f1416f7ca0e7
Signed-off-by: Kaushik Lingarkar <quic_kaushikl@quicinc.com>
 		2021-12-02 10:45:37 +01:00
.mvn Configure max heap size for Maven build 2016-12-09 11:02:10 +01:00
Documentation/technical reftable: explicitly store update_index per ref 2017-08-21 15:39:08 -07:00
lib Bazel: Add missing newlines at end of BUILD files 2019-11-26 08:43:10 +01:00
org.eclipse.jgit FileSnapshot: Lazy load file store attributes cache 2021-12-02 10:45:37 +01:00
org.eclipse.jgit.ant Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.ant.test Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.archive Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.benchmarks Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.http.apache Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.http.server Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.http.test Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.junit Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.junit.http [test] Create keystore with the keytool of the running JDK 2021-07-29 12:47:16 +02:00
org.eclipse.jgit.lfs Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.lfs.server Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
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org.eclipse.jgit.lfs.test Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.packaging Update eclipse-jarsigner-plugin to 1.3.2 2021-12-02 10:45:36 +01:00
org.eclipse.jgit.pgm Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
org.eclipse.jgit.pgm.test Prepare 5.1.17-SNAPSHOT builds 2021-06-05 00:45:08 +02:00
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tools Bazel: Use java_plugin and java_binary from @rules_java in jmh.bzl 2019-11-26 08:43:34 +01:00
.bazelversion Update bazlets and bazel version 2021-05-14 23:37:43 +02:00
.gitattributes Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
.gitignore git ignore .DS_Store 2017-07-28 11:09:47 +01:00
.mailmap Update .mailmap 2018-06-27 13:42:29 +09:00
BUILD Bazel: Support building with Java 9 2018-02-07 17:51:35 -05:00
CONTRIBUTING.md Update SUBMITTING_PATCHES 2014-07-20 17:44:53 -04:00
LICENSE Clean up LICENSE file 2010-07-02 14:52:49 -07:00
README.md Update minimum JDK version in README 2017-02-10 18:47:39 -04:00
WORKSPACE Update bazlets and bazel version 2021-05-14 23:37:43 +02:00
pom.xml Update eclipse-jarsigner-plugin to 1.3.2 2021-12-02 10:45:36 +01:00

README.md

Java Git

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.

  • org.eclipse.jgit

    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.

  • org.eclipse.jgit.ant

    Ant tasks based on JGit.

  • org.eclipse.jgit.archive

    Support for exporting to various archive formats (zip etc).

  • org.eclipse.jgit.http.apache

    Apache httpclient support

  • org.eclipse.jgit.http.server

    Server for the smart and dumb Git HTTP protocol.

  • org.eclipse.jgit.pgm

    Command-line interface Git commands implemented using JGit ("pgm" stands for program).

  • org.eclipse.jgit.packaging

    Production of Eclipse features and p2 repository for JGit. See the JGit Wiki on why and how to use this module.

Tests

  • org.eclipse.jgit.junit

    Helpers for unit testing

  • org.eclipse.jgit.test

    Unit tests for org.eclipse.jgit

  • org.eclipse.jgit.ant.test

  • org.eclipse.jgit.pgm.test

  • org.eclipse.jgit.http.test

  • org.eclipse.jgit.junit.test

    No further description needed

Warnings/Caveats

  • 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.

Package Features

  • org.eclipse.jgit/

    • 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.

    • Garbage collection

    • Merge

    • Rebase

    • And much more

  • org.eclipse.jgit.pgm/

    • Assorted set of command line utilities. Mostly for ad-hoc testing of jgit log, glog, fetch etc.

  • org.eclipse.jgit.ant/

    • Ant tasks

  • org.eclipse.jgit.archive/

    • Support for Zip/Tar and other formats

  • org.eclipse.http.*/

    • HTTP client and server support

Missing Features

There are some missing features:

  • gitattributes support

Support

Post question, comments or patches to the jgit-dev@eclipse.org mailing list. You need to be subscribed to post, see here:

https://dev.eclipse.org/mailman/listinfo/jgit-dev

Contributing

See the EGit Contributor Guide:

http://wiki.eclipse.org/EGit/Contributor_Guide

About Git

More information about Git, its repository format, and the canonical C based implementation can be obtained from the Git website:

http://git-scm.com/