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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703695#action_12703695
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Yonik Seeley commented on LUCENE-1313:
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bq. Yonik raised a good question on LUCENE-1618, which is what gains do we
really expect to see by using RAMDir for the tiny recently flushed segments?
I raised it more because of the direction the discussion was veering (write
through caching to a RAMDirectory, and RAMDirectory being faster to *search*).
I do believe that RAMDirectory can probably improve NRT, but it would be due
to avoiding waiting for file open/write/close/open/read (as Mike also said)...
and not any difference during IndexSearcher.search(), which should be
irrelevant due to the relative size differences of the RAMDirectory and the
FSDirectory. Small file creation speeds will also be heavily dependent on the
exact file system used.
> 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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