jgit/org.eclipse.jgit at 5d446f410d7044fba165ad3deee7ac83864f0e96 - jgit

纯java实现的git操作库。

Shawn Pearce 5d446f410d Support cutting existing delta chains longer than the max depth Some packs built by JGit have incredibly long delta chains due to a long standing bug in PackWriter. Google has packs created by JGit's DfsGarbageCollector with chains of 6000 objects long, or more. Inflating objects at the end of this 6000 long chain is impossible to complete within a reasonable time bound. It could take a beefy system hours to perform even using the heavily optimized native C implementation of Git, let alone with JGit. Enable pack.cutDeltaChains to be set in a configuration file to permit the PackWriter to determine the length of each delta chain and clip the chain at arbitrary points to fit within pack.depth. Delta chain cycles are still possible, but no attempt is made to detect them. A trivial chain of A->B->A will iterate for the full pack.depth configured limit (e.g. 50) and then pick an object to store as non-delta. When cutting chains the object list is walked in reverse to try and take advantage of existing chain computations. The assumption here is most deltas are near the end of the list, and their bases are near the front of the list. Going up from the tail attempts to reuse chainLength computations by relying on the memoized value in the delta base. The chainLength field in ObjectToPack is overloaded into the depth field normally used by DeltaWindow. This is acceptable because the chain cut happens before delta search, and the chainLength is reset to 0 if delta search will follow. Change-Id: Ida4fde9558f3abbbb77ade398d2af3941de9c812		12 years ago
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.settings	Harmonize the JDT settings within JGit	12 years ago
META-INF	Grant access to jgit internals to junit and http.server bundles	12 years ago
findBugs	[findBugs] Silence warning about Transport initialization	12 years ago
resources/org/eclipse/jgit/internal	Allow to get repo statistics from GarbageCollectionCommand before gc	12 years ago
src/org/eclipse/jgit	Support cutting existing delta chains longer than the max depth	12 years ago
.classpath	Externalize strings from JGit	15 years ago
.fbprefs	Initial JGit contribution to eclipse.org	15 years ago
.gitignore	Finish removing Apache Felix maven-bundle-plugin	15 years ago
.project	Revert "Hide Maven target directories from Eclipse"	15 years ago
about.html	Add missing about.html files to all shipped bundles	14 years ago
build.properties	Add "resources/" as a source folder	15 years ago
plugin.properties	Remove incubation marker	14 years ago
pom.xml	JGit 3.0: move internal classes into an internal subpackage	12 years ago