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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3142) remove O(n^2) slow slow indexing defaults in DataImportHandler
Date Tue, 21 Feb 2012 17:38:34 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212760#comment-13212760
] 

Uwe Schindler commented on SOLR-3142:
-------------------------------------

any optimizing after a full import over a non-empty index is no longer really needed in Lucene
(even if you do a IndexWriter.deleteAll() before as the fullimport does). Once IndexWriter
merges (or on close or commit) and detects a segment only contains of deleted documents it
will drop it. This was indeed not true in the past, but since Lucene 3.1 or like that it is.
                
> remove O(n^2) slow slow indexing defaults in DataImportHandler
> --------------------------------------------------------------
>
>                 Key: SOLR-3142
>                 URL: https://issues.apache.org/jira/browse/SOLR-3142
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 3.6, 4.0
>
>         Attachments: SOLR-3142.patch
>
>
> By default, dataimporthandler optimizes the entire index when it commits.
> This is bad for performance, because it means by default its doing a very
> heavy index-wide operation even for an incremental update... essentially 
> O(n^2) indexing.
> All that is needed is to set optimize=false by default. If someone wants
> to optimize, they can either set optimize=true or explicitly optimize themselves.

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