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https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017909#comment-13017909
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Mark Miller commented on SOLR-2193:
-----------------------------------
So one issue to consider:
If we start sharing the IndexWriter across SolrCores like this, on SolrCore
reload, if you have changed IndexWriter settings, they will not take affect.
My thinking here is that that is not really a big deal.
I'm thinking perhaps we might do the following:
1. On reload, print a log warning that if IndexWriter settings have changed,
they have not been picked up?
2. Add another param to the update/commit cmd that lets you force the opening
of a new IndexWriter with the latest settings.
> 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: Mark Miller
> Fix For: 4.0
>
> Attachments: 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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