[OAK-2201] Make blobSize in OakDirectory configurable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.8, 1.1.2
• Component/s: lucene
• Assignee: Chetan Mehrotra
• Reporter: Chetan Mehrotra
• Created: 16/Oct/14 06:42
• Updated: 08/Oct/19 15:21
• Resolved: 31/Oct/14 06:12

Description

Currently OakDirectory in Lucene splits the index file in size of 32kb. It would be better if this this is made configurable.

1. Possibility to set it to higher value like 1MB - Original size was kept small to allow them to be made part of Segment data itself and make use of MMap IO. However when working with DocumentNodeStore it does not provide much benifit.
2. As the value is power of 2 it causes wasted space when blobs are stored in MongoDocumentStore (OAK-2105)

Any change should be backward compatibile

Issue Links

• relates to: OAK-2105 Review padding for blobs collection
• supercedes: OAK-1870 Lucene blob size different in trunk and 1.0 branch