[LUCENE-2602] Default merge policy should take deletions into account

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1, 4.0-ALPHA
• Fix Version/s: 3.1, 4.0-ALPHA
• Component/s: core/index
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 14/Aug/10 09:33
• Updated: 28/Aug/22 12:31
• Resolved: 14/Aug/10 10:22

Description

LUCENE-1634 added a calibrateSizeByDeletes; we had a TODO to default this to true as of 3.0 but we missed it. I'll fix it now for 3.1 and 4.0. While this is technically a change in back-compat (for 3.x), I think it's fine to make an exception here; this should be a big win for indices that have high doc turnover with time.