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https://issues.apache.org/jira/browse/SOLR-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14340694#comment-14340694
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Shalin Shekhar Mangar commented on SOLR-7128:
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bq. Since I haven't managed to cut a 4.10.4 yet (various fun Lucene issues...)
maybe it makes sense to backport for 4.10.4?
Thanks for waiting [~mikemccand]! The test actually took some time to back-port
because of so many changes in Solr's test suite between 4.x and 5.0.
Note to anyone who reviews my 4.10 commit -- I had to change the
solr-trackingshardhandler.xml to use the old style solr.xml otherwise it
wouldn't load collection1. Since there was no time to find/fix any bugs, I
chose the easy way and changed the format of solr.xml itself. I verified that
the TestTrackingShardHandler factory still tests the right things and passes.
> 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
> Priority: Critical
> Fix For: 4.10.4, Trunk, 5.1
>
> Attachments: SOLR-7128-addendum.patch, 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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