[jira] [Commented] (SOLR-7128) Two phase distributed search is fetching extra fields in GET_TOP_IDS phase

["Hoss Man (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334174#comment-14334174 ] 

Hoss Man commented on SOLR-7128:
--------------------------------

I had a lot of feedback/ideas about the TrackingShardHandlerFactory, but not a lot of feedback/comments/ideas about the root issue here, so i went ahead and filed SOLR-7147 for you.

> 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
>
>
> [~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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