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https://issues.apache.org/jira/browse/SOLR-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12482414
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Yonik Seeley commented on SOLR-124:
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> Does anyone have a feeling on whether LUCENE-565 will improve performance?
Probably not much, if at all. Deletions happen after a segment flush, which is
slightly less efficient (more indexreaders that need to be opened), but does
get deletions in the index faster (meaning they are more likely to be
"squeezed" out by a subsequent segment merge).
One small advantage to LUCENE-565 is that overwriting is atomic... you can't
crash and see duplicates.
The patch has been changed around multiple times, and it would now be necessary
to include a lucene package in solr to get access to package-protected stuff
that would allow efficient delete-by-query.
> use NewIndexModifier, LUCENE-565
> --------------------------------
>
> Key: SOLR-124
> URL: https://issues.apache.org/jira/browse/SOLR-124
> Project: Solr
> Issue Type: Improvement
> Components: update
> Reporter: Yonik Seeley
>
> LUCENE-565 adds extension points to the IndexWriter, and adds delete-by-term
> functionality.
> We should probably take advantage of this (when available) in our
> UpdateHandler (a new one, or modify DU2?)
> and perhaps implement a more efficient deleteByQuery.
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