Re-architect Update Handler
---------------------------
Key: SOLR-2193
URL: https://issues.apache.org/jira/browse/SOLR-2193
Project: Solr
Issue Type: Improvement
Reporter: Mark Miller
Fix For: Next
The update handler needs an overhaul.
A few goals I think we might want to look at:
1. Cleanup - drop DirectUpdateHandler(2) line - move to something like
UpdateHandler, DefaultUpdateHandler
2. Expose the SolrIndexWriter in the api or add the proper abstractions to get
done what we know do with special casing:
if (directupdatehandler2)
success
else
failish
3. Stop closing the IndexWriter and start using commit.
4. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
5. Keep NRT support in mind.
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