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https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041767#comment-13041767
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Jason Rutherglen commented on SOLR-2193:
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{quote}solving our rather nasty reload a core, briefly different writers on the
same index problem (usually avoided because the overlap is brief and the
IndexWriter created lazily).{quote}
Robert I fully agree, however then the title of the Jira is incorrect.
Also the whole ref counted thing in Solr:
{code}
RefCounted<SolrIndexSearcher> holder = core.getNewestSearcher(false);
SolrIndexSearcher s = holder.get();
holder.decref();
// since there could be two commits in a row, don't test for a specific new
searcher
// just test that the old one has been replaced.
{code}
Should not be needed anymore. We're also adding ref counting on IWs now as
well? All of this is unnecessary. If we're modularizing, this isn't right
path to go one.
> 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: 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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