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https://issues.apache.org/jira/browse/SOLR-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337984#comment-14337984
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Shalin Shekhar Mangar commented on SOLR-7128:
---------------------------------------------
Erick, this is a different bug. The bug is that the complete list of fields
from the 'fl' param were being requested in the first phase of distributed
search. Really only id and/or score is required in this first phase with the
current distributed search algorithm.
How those are fields are actually retrieved by a shard is the subject of
SOLR-6888 and whether id is really required to be fetched at all is the subject
of SOLR-6810.
> Two phase distributed search is fetching extra fields in GET_TOP_IDS phase
> --------------------------------------------------------------------------
>
> Key: SOLR-7128
> URL: https://issues.apache.org/jira/browse/SOLR-7128
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 4.10.2, 4.10.3
> Reporter: Shalin Shekhar Mangar
> Assignee: Shalin Shekhar Mangar
> Fix For: Trunk, 5.1
>
> Attachments: SOLR-7128.patch, SOLR-7128.patch, SOLR-7128.patch,
> SOLR-7128.patch
>
>
> [~pqueixalos] reported this to me privately so I am creating this issue on
> his behalf.
> {quote}
> We found an issue in versions 4.10.+ (4.10.2 and 4.10.3 for sure).
> When processing a two phase distributed query with an explicit fl parameter,
> the two phases are well processed, but the GET_TOP_IDS retrieves the matching
> documents fields, even if a GET_FIELDS shard request is getting executed just
> after.
> /solr/someCollectionCore?collection=someOtherCollection&q=*:*&debug=true&fl=id,title
> => id is retrieved during GET_TOP_IDS phase that's ok:: it's our
> uniqueKeyField
> => title is also retrieved during GET_TOP_IDS phase, that's not ok.
> {quote}
> I'm able to reproduce this. This is pretty bad performance bug that was
> introduced in SOLR-5768 or it's subsequent related issues. I plan to fix this
> bug and add substantial tests to assert such things.
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