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https://issues.apache.org/jira/browse/SOLR-7799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14629888#comment-14629888
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Erik Hatcher commented on SOLR-7799:
------------------------------------

I tested with two indexes, 4k docs with (the same) 4k fields each.  One index 
has the fields as long, the other as text_general.

{code}
lots of long fields:
/solr/lotsafields_long/admin/luke?numTerms=0&includeIndexFieldFlags=true&indent=on:
 801ms
/solr/lotsafields_long/admin/luke?numTerms=0&includeIndexFieldFlags=false&indent=on:
 13ms

lots of text_general fields:
/solr/lotsafields_txt/admin/luke?numTerms=0&includeIndexFieldFlags=true&indent=on:
 2169ms
/solr/lotsafields_txt/admin/luke?numTerms=0&includeIndexFieldFlags=false&indent=on:
 16ms
{code}

> LukeRequestHandler too slow when there are many fields
> ------------------------------------------------------
>
>                 Key: SOLR-7799
>                 URL: https://issues.apache.org/jira/browse/SOLR-7799
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 5.2
>            Reporter: Erik Hatcher
>            Assignee: Erik Hatcher
>             Fix For: 5.3
>
>         Attachments: SOLR-7799.patch
>
>
> /admin/luke responds very slowly when there are many fields in the index.  
> The issue is with getFirstLiveDoc() spinning its wheels a lot to get the 
> index flags.



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