[LUCENE-1313] Near Realtime Search (using a built in RAMDirectory)

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 2.4.1
• Fix Version/s: 4.0-ALPHA
• Component/s: core/index
• Lucene Fields: New, Patch Available
• Assignee: Unassigned
• Reporter: Jason Rutherglen
• Created: 22/Jun/08 17:02
• Updated: 28/Aug/22 11:50
• Resolved: 24/Jan/11 21:16

Description

Enable near realtime search in Lucene without external
dependencies. When RAM NRT is enabled, the implementation adds a
RAMDirectory to IndexWriter. Flushes go to the ramdir unless
there is no available space. Merges are completed in the ram
dir until there is no more available ram.

IW.optimize and IW.commit flush the ramdir to the primary
directory, all other operations try to keep segments in ram
until there is no more space.

Issue Links

• blocks: LUCENE-1667 ConcurrentMergeScheduler use a thread pool (per directory)
• depends upon: LUCENE-1618 Allow setting the IndexWriter docstore to be a different directory
• is depended upon by: SOLR-1278 Near Realtime Search Replication
• relates to: LUCENE-1577 Benchmark of different in RAM realtime techniques