[OAK-1656] Provide lazy iterator for FileDataStore.getAllIdentifiers

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.20
• Component/s: core
• Assignee: Chetan Mehrotra
• Reporter: Chetan Mehrotra
• Created: 01/Apr/14 10:34
• Updated: 08/Apr/14 12:47
• Resolved: 01/Apr/14 11:01

Description

Currently FileDataStore.getAllIdentifiers evaluates all file eagerly and maintains the set in memory

As an optimization i.e. prevent loading of all file names in memory we can use com.google.common.io.Files#fileTreeTraverser. This is currently used in org.apache.jackrabbit.oak.spi.blob.FileBlobStore#getAllChunkIds

Same logic can be done for OakFileDataStore which extends the FileDataStore