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https://issues.apache.org/jira/browse/LUCENE-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13541053#comment-13541053
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Sivan Yogev commented on LUCENE-4258:
-------------------------------------
Started switching to the invert-first approach following Mike's advices. My
thought was to have a single directory for each fields update, and when
flushing do something similar to IndexWriter.addIndexes(IndexReader...) and
build the stacked segment. However, I encountered two problems with this
approach:
1. If a certain document is updated more than once in a certain generation, two
inverted documents should be merged into one,
2. extension to 1, where a field added in the first update is to be replaced in
the second one.
So, what I will try to do in such cases is to move the later updates to a new
update generation. This will increase the number of generations, but I think
it's a fair price to pay in light of the benefits offered by the invert-first
approach.
> Incremental Field Updates through Stacked Segments
> --------------------------------------------------
>
> Key: LUCENE-4258
> URL: https://issues.apache.org/jira/browse/LUCENE-4258
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Sivan Yogev
> Fix For: 4.2, 5.0
>
> Attachments: IncrementalFieldUpdates.odp,
> LUCENE-4258-API-changes.patch, LUCENE-4258.r1410593.patch,
> LUCENE-4258.r1412262.patch, LUCENE-4258.r1416438.patch,
> LUCENE-4258.r1416617.patch, LUCENE-4258.r1422495.patch,
> LUCENE-4258.r1423010.patch
>
> Original Estimate: 2,520h
> Remaining Estimate: 2,520h
>
> Shai and I would like to start working on the proposal to Incremental Field
> Updates outlined here (http://markmail.org/message/zhrdxxpfk6qvdaex).
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