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https://issues.apache.org/jira/browse/SOLR-3142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved SOLR-3142.
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Resolution: Fixed
> 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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