[OAK-1772] Expose an extension point to move in memory state in UnsavedModification to persisted map

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0
• Component/s: mongomk
• Assignee: Chetan Mehrotra
• Reporter: Chetan Mehrotra
• Created: 28/Apr/14 10:26
• Updated: 04/Jun/14 10:16
• Resolved: 28/Apr/14 11:53

Description

Currently DocumentNodeStore stores some state in org.apache.jackrabbit.oak.plugins.document.UnsavedModifications class related to branch commit. If number of branch commit are large (say in migration) then this state grows proportionally to the number of nodes getting added/modified in that branch and thus can cause OOM.

To support such cases we can use a persisted map impl like mapdb [1]. To enable such usage an extension point need to be added in UnsavedModifications to change the impl

[1] http://www.mapdb.org/

Issue Links

• is related to: OAK-1773 Optimize upgrade to DocumentNodeStore