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Bug 312964

Summary:	Allow PackIndex to GC under memory pressure
Product:	[Technology] JGit	Reporter:	Shawn Pearce <sop>
Component:	JGit	Assignee:	Project Inbox <jgit.core-inbox>
Status:	NEW ---	QA Contact:
Severity:	enhancement
Priority:	P3	CC:	matthias.sohn
Version:	unspecified
Target Milestone:	---
Hardware:	All
OS:	All
Whiteboard:

Description Shawn Pearce

2010-05-14 15:10:22 EDT

When PackFile opens a PackIndex to scan it, the PackIndex sticks around forever.  This mirrors C Git behavior which does the same thing.  But in a server environment JGit may need to juggle thousands of pack indexes within a single JVM.  If a repository isn't accessed frequently, or even if its ancient history is infrequently accessed, some (or all) of its PackIndexes should be able to be discarded from memory and reloaded later on demand.

We might also want to tie these into a limited size cache, similar to what we already do with ByteWindow.