[SOLR-2565] Prevent IW#close and cut over to IW#commit

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0-ALPHA
• Fix Version/s: 4.0-ALPHA
• Component/s: update
• Assignee: Mark Miller
• Reporter: Simon Willnauer
• Created: 01/Jun/11 07:32
• Updated: 10/May/13 10:41
• Resolved: 07/Oct/11 11:41

Description

Spinnoff from SOLR-2193. We already have a branch to work on this issue here https://svn.apache.org/repos/asf/lucene/dev/branches/solr2193

The main goal here is to prevent solr from closing the IW and use IW#commit instead. AFAIK the main issues here are:

The update handler needs an overhaul.

A few goals I think we might want to look at:

1. Expose the SolrIndexWriter in the api or add the proper abstractions to get done what we now do with special casing:
2. Stop closing the IndexWriter and start using commit (still lazy IW init though).
3. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
4. Address the current issues we face because multiple original/'reloaded' cores can have a different IndexWriter on the same index.

Eventually this is a preparation for NRT support in Solr which I will create a followup issue for.

Issue Links

• depends upon: SOLR-2279 Add a MockDirectoryFactory (or similar) for Solr tests
• incorporates: SOLR-3587 After reloading a SolrCore, the original Analyzer is still used rather than a new one.
• is related to: HBASE-3529 Add search to HBase
• supercedes: SOLR-2193 Re-architect Update Handler