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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702683#action_12702683
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Michael McCandless commented on LUCENE-1313:
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One separate optimization we should make with NRT is to not close the doc store
(stored fields, term vector) files when flushing for an NRT reader.
We do close them now, which then makes merging quite a bit more costly.
The trickiness with this optimization is we'd need to be able to somehow share
an IndexInput & IndexOutput; or, perhaps we can open an IndexInput even though
an IndexOutput has the same file open (Windows may prevent this, though I think
I've seen that it will in fact allow it).
Once we do that optimization, then with this RAMDir optimization we should try
to have the doc store files punch straight through to the real directory, ie
bypass the RAMDir. The doc stores are space consuming, and since with
autoCommit=false we can bypass merging them, it makes no sense to store them in
the RAMDir.
We should probably do this optimization as a "phase 2", after this one.
> Realtime Search
> ---------------
>
> Key: LUCENE-1313
> URL: https://issues.apache.org/jira/browse/LUCENE-1313
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Index
> Affects Versions: 2.4.1
> Reporter: Jason Rutherglen
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1313.jar, LUCENE-1313.patch, LUCENE-1313.patch,
> LUCENE-1313.patch, LUCENE-1313.patch, lucene-1313.patch, lucene-1313.patch,
> lucene-1313.patch, lucene-1313.patch
>
>
> Realtime search with transactional semantics.
> Possible future directions:
> * Optimistic concurrency
> * Replication
> Encoding each transaction into a set of bytes by writing to a RAMDirectory
> enables replication. It is difficult to replicate using other methods
> because while the document may easily be serialized, the analyzer cannot.
> I think this issue can hold realtime benchmarks which include indexing and
> searching concurrently.
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