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https://issues.apache.org/jira/browse/LUCENE-2312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973092#action_12973092
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Jason Rutherglen commented on LUCENE-2312:
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After further thought, there really isn't a choice here, the field cache values
must be added as documents are added, or inefficiently generated from scratch
per reader. The latter could be used to allow all tests to pass, however the
excessive garbage generated could even preclude that.
I think this'll mean introspecting for existing RT field cache entries and add
values to them as documents are added.
> Search on IndexWriter's RAM Buffer
> ----------------------------------
>
> Key: LUCENE-2312
> URL: https://issues.apache.org/jira/browse/LUCENE-2312
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Search
> Affects Versions: Realtime Branch
> Reporter: Jason Rutherglen
> Assignee: Michael Busch
> Fix For: Realtime Branch
>
> Attachments: LUCENE-2312.patch
>
>
> In order to offer user's near realtime search, without incurring
> an indexing performance penalty, we can implement search on
> IndexWriter's RAM buffer. This is the buffer that is filled in
> RAM as documents are indexed. Currently the RAM buffer is
> flushed to the underlying directory (usually disk) before being
> made searchable.
> Todays Lucene based NRT systems must incur the cost of merging
> segments, which can slow indexing.
> Michael Busch has good suggestions regarding how to handle deletes using max
> doc ids.
> https://issues.apache.org/jira/browse/LUCENE-2293?focusedCommentId=12841923&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12841923
> The area that isn't fully fleshed out is the terms dictionary,
> which needs to be sorted prior to queries executing. Currently
> IW implements a specialized hash table. Michael B has a
> suggestion here:
> https://issues.apache.org/jira/browse/LUCENE-2293?focusedCommentId=12841915&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12841915
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