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https://issues.apache.org/jira/browse/LUCENE-1313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12702496#action_12702496
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Jason Rutherglen commented on LUCENE-1313:
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For this patch I'm debating whether to add a package protected
IndexWriter.addIndexWriter method. The problem is, the RAMIndex
blocks on the write to disk during IW.addIndexesNoOptimize which
if we're using ConcurrentMergeScheduler shouldn't happen?
Meaning in this proposed solution, if segments keep on piling up
in RAMIndex, we simply move them over to the disk IW which will
in the background take care of merging them away and to disk.
I don't think it's necessary to immediately write ram segments
to disk (like the current patch does), instead it's possible to
simply copy segments over from the incoming IW, leave them in
RAM and they can be merged to disk as necessary? Then on
IW.flush any segmentinfo(s) that are not from the current
directory can be flushed to disk?
Just thinking out loud about this.
> 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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