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https://issues.apache.org/jira/browse/LUCENE-1516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675397#action_12675397
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Michael McCandless commented on LUCENE-1516:
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Or, here's an idea: can we do both? Put IndexAccessor as an optional
"convenience" layer that simplifies the ctors and expert methods of IW
& IR, but leave public direct access to the ctros & expert methods?
This way on upgrade nobody is forced to migrate to an entirely new yet
simply pass-through API?
Or another idea is to decouple these two discussions: go ahead and add
the single expert method to IW, but as a separate discussion/JIRA work
out how we can simplify overall access/management of IR/IW instances?
> Integrate IndexReader with IndexWriter
> ---------------------------------------
>
> Key: LUCENE-1516
> URL: https://issues.apache.org/jira/browse/LUCENE-1516
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch,
> LUCENE-1516.patch, LUCENE-1516.patch, LUCENE-1516.patch
>
> Original Estimate: 672h
> Remaining Estimate: 672h
>
> The current problem is an IndexReader and IndexWriter cannot be open
> at the same time and perform updates as they both require a write
> lock to the index. While methods such as IW.deleteDocuments enables
> deleting from IW, methods such as IR.deleteDocument(int doc) and
> norms updating are not available from IW. This limits the
> capabilities of performing updates to the index dynamically or in
> realtime without closing the IW and opening an IR, deleting or
> updating norms, flushing, then opening the IW again, a process which
> can be detrimental to realtime updates.
> This patch will expose an IndexWriter.getReader method that returns
> the currently flushed state of the index as a class that implements
> IndexReader. The new IR implementation will differ from existing IR
> implementations such as MultiSegmentReader in that flushing will
> synchronize updates with IW in part by sharing the write lock. All
> methods of IR will be usable including reopen and clone.
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