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From "Johann Abraham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-8774) Performance improvement for update?optimize=true
Date Fri, 19 Apr 2019 14:41:00 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-8774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16821965#comment-16821965
] 

Johann Abraham commented on LUCENE-8774:
----------------------------------------

Associated PR: [https://github.com/apache/lucene-solr/pull/651]

> Performance improvement for update?optimize=true
> ------------------------------------------------
>
>                 Key: LUCENE-8774
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8774
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/codecs
>    Affects Versions: trunk, 7.2.1
>            Reporter: Johann Abraham
>            Priority: Major
>         Attachments: 0001-Performance-improvement-for-update-optimize-true.patch
>
>
> Running optimize on a document set that has a large number of docValue fields grows linearly
with the number of docValue fields. 
> We discovered this because our corpus has few documents but a very large number of dynamic
docValue fields.  
> The cause is in the FilterFieldInfor constructor, a linear search of the fielterFields
occurs due to the filterFields.contains(...) function call.
> Changing the underlying Collection type from an ArrayList to a LinkedHashSet decreased
our optimize time from 60 minutes to < 1 minute.  Patch attached.



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