[LUCENE-8887] CLONE - Add setting for moving FST offheap/onheap

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Fix Version/s: 8.1, 9.0
• Component/s: core/FSTs, core/store
• Lucene Fields: New
• Assignee: Simon Willnauer
• Reporter: LuYunCheng
• Created: 27/Jun/19 03:50
• Updated: 28/Aug/22 15:47
• Resolved: 27/Jun/19 13:00

Description

While LUCENE-8635, adds support for loading FST offheap using mmap, users do not have the flexibility to specify fields for which FST needs to be offheap. This allows users to tune heap usage as per their workload.

Ideal way will be to add an attribute to FieldInfo, where we have put/getAttribute. Then FieldReader can inspect the FieldInfo and pass the appropriate On/OffHeapStore when creating its FST. It can support special keywords like ALL/NONE.

Issue Links

• is a clone of: LUCENE-8671 Add setting for moving FST offheap/onheap
• relates to: LUCENE-8635 Lazy loading Lucene FST offheap using mmap
• links to: GitHub Pull Request #606
• links to: GitHub Pull Request #610
• links to: GitHub Pull Request #613
• links to: GitHub Pull Request #640