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From "Hoss Man (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 17:30:35 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212752#comment-13212752
] 

Hoss Man commented on SOLR-3142:
--------------------------------

FWIW: I'm pretty sure the original assumption here was that in the (relatively common) usecase
of doing a full-import rebuild on a regular basis (ie: nightly) that it can be handy to have
it auto-optimize when you are done.   I think the real problem is that that assumption was
never challeneged regarding things like delta import.

so an argument could be made the the default should still be to optimze=true on full-import,
and optimize=false on delta import ... but i'm not going to make that argument, i think this
it's silly to assume true in either case.  (particularly since a parameterized full import
might actually be a rapidly repeating incremental)
                
> 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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