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https://issues.apache.org/jira/browse/SOLR-7128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shalin Shekhar Mangar updated SOLR-7128:
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Attachment: SOLR-7128.patch
This was introduced in SOLR-6796.
Here's a test which exposes this issue.
# I created a TrackingShardHandlerFactory which can record shard requests sent
from any node. There are a few helper methods to get requests by shard and by
purpose.
# The new test TestTwoPhaseDistributedQuery uses this factory to assert the
fields which are being requested in GET_TOP_IDS phase.
I will likely move the TrackingShardHandlerFactory into its own issue because
it is helpful for other distributed tests as well. I also need to decouple it
from the MiniSolrCloudCluster abstraction. I found a problem in
MiniSolrCloudCluster too and opened SOLR-7146
I'm working on a fix.
> 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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