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https://issues.apache.org/jira/browse/SOLR-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13903824#comment-13903824
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Shalin Shekhar Mangar commented on SOLR-1880:
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bq. Also, the "fl" param only gets id, score and sort columns, it would
probably be cheaper to fetch the final sort column data in STAGE_EXECUTE_QUERY
which has to read the sort column data anyway, and skip STAGE_GET_FIELDS.
Thanks Vitaliy. When fl=id,score,sortField then the STAGE_GET_FIELDS is still
executed, right? In other words, the only case which is optimized is when
fl=id,score. That alone is also a nice improvement but since the issue
description as well as your test has the above comment, I thought I should ask.
> Performance: Distributed Search should skip GET_FIELDS stage if EXECUTE_QUERY
> stage gets all fields
> ---------------------------------------------------------------------------------------------------
>
> Key: SOLR-1880
> URL: https://issues.apache.org/jira/browse/SOLR-1880
> Project: Solr
> Issue Type: Improvement
> Components: search
> Affects Versions: 1.4
> Reporter: Shawn Smith
> Assignee: Shalin Shekhar Mangar
> Attachments: ASF.LICENSE.NOT.GRANTED--one-pass-query-v1.4.0.patch,
> ASF.LICENSE.NOT.GRANTED--one-pass-query.patch, SOLR-1880.patch
>
>
> Right now, a typical distributed search using QueryComponent makes two HTTP
> requests to each shard:
> # STAGE_EXECUTE_QUERY executes one HTTP request to each shard to get top N
> ids and sort keys, merges the results to produce a final list of document IDs
> (PURPOSE_GET_TOP_IDS).
> # STAGE_GET_FIELDS executes a second HTTP request to each shard to get the
> document field values for the final list of document IDs (PURPOSE_GET_FIELDS).
> If the "fl" param is just "id" or just "id,score", all document data to
> return is already fetched by STAGE_EXECUTE_QUERY. The second
> STAGE_GET_FIELDS query is completely unnecessary. Eliminating that 2nd HTTP
> request can make a big difference in overall performance.
> Also, the "fl" param only gets id, score and sort columns, it would probably
> be cheaper to fetch the final sort column data in STAGE_EXECUTE_QUERY which
> has to read the sort column data anyway, and skip STAGE_GET_FIELDS.
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