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https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016874#comment-13016874
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Yonik Seeley commented on SOLR-2193:
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NRT finally... sweet!
I wonder how this should work with autocommit?
Someone may want a soft/reopen autocommit once every x seconds, but still may
want a hard "flush to stable storage in case I crash" commit at some other
duration.
The other thing that might be cool is a client-specified freshness per request.
For example, when they pass in a query, they specify that they need data
that's no more than 1 second old... and if it's too old that will trigger a
reopen (and block that specific request until the new searcher can be used).
The benefit here is that big bulk uploads won't be interrupted if there is no
time sensitive query traffic. The downside is that a high latency may be
exposed to those requests if they depend on stuff that can take a lot of time
the first time (like faceting).
> 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
>
>
> 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)
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