[OAK-10549] Improve performance of facet count at scale (Lucene)

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.60.0
• Component/s: lucene, query
• Assignee: Thomas Mueller
• Reporter: Thomas Mueller
• Created: 14/Nov/23 14:02
• Updated: 06/Dec/23 18:49
• Resolved: 17/Nov/23 13:25

Description

Currently, reading many facets (eg. 20) at a time is quite slow when using a Lucene index. We already cache the data, but performance is not all that great. One of the reasons is that we run one Lucene query per facet column.

It is possible to speed this up, using eager facet caching.

Issue Links

• relates to: OAK-8898 On querying, IndexReader failed with AlreadyClosedException
• links to: GitHub Pull Request #1215