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https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041997#comment-13041997
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Robert Muir commented on SOLR-2193:
-----------------------------------

I committed this patch (with some additional ref counting checks in 
SolrTestCaseJ4) to https://svn.apache.org/repos/asf/lucene/dev/branches/solr2193

Jason (or anyone else!): if you want to be involved, please contribute 
constructively in the form of useful ideas and patches against this branch.

In the meantime, I will be trying to improve the tests for what exists now, as 
its the best way (not manual reviews) to increase my confidence.

> Re-architect Update Handler
> ---------------------------
>
>                 Key: SOLR-2193
>                 URL: https://issues.apache.org/jira/browse/SOLR-2193
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Robert Muir
>             Fix For: 4.0
>
>         Attachments: SOLR-2193.patch, SOLR-2193.patch, SOLR-2193.patch, 
> SOLR-2193.patch, SOLR-2193.patch, SOLR-2193.patch
>
>
> 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 now do with special casing:
> if (directupdatehandler2)
>   success
>  else
>   failish
> 3. Stop closing the IndexWriter and start using commit (still lazy IW init 
> though).
> 4. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
> 5. Keep NRT support in mind.
> 6. Keep microsharding in mind (maintain logical index as multiple physical 
> indexes)
> 7. Address the current issues we face because multiple original/'reloaded' 
> cores can have a different IndexWriter on the same index.

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