[LUCENE-4540] Allow packed ints norms

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.2, 6.0
• Component/s: core/index
• Lucene Fields: New
• Assignee: Robert Muir
• Reporter: Robert Muir
• Created: 06/Nov/12 01:29
• Updated: 28/Aug/22 13:31
• Resolved: 08/Feb/13 03:30

Description

I was curious what the performance would be, because it might be useful option to use packedints for norms if you have lots of fields and still want good scoring:

Today the smallest norm per-field-per-doc you can use is a single byte, and if you have f fields with norms enabled and n docs, it uses f * n bytes of space in RAM.

Especially if you aren't using index-time boosting (or even if you are, but not with ridiculous values), this could be wasting a ton of RAM.

But then I noticed there was no clean way to allow you to do this in your Similarity: its a trivial patch.

Issue Links

• is part of: LUCENE-4547 DocValues field broken on large indexes