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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-124) use NewIndexModifier, LUCENE-565
Date Tue, 20 Mar 2007 15:37:32 GMT

    [ https://issues.apache.org/jira/browse/SOLR-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12482414
] 

Yonik Seeley commented on SOLR-124:
-----------------------------------

> 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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