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https://issues.apache.org/jira/browse/SOLR-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shawn Smith updated SOLR-1880:
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Attachment: one-pass-query-v1.4.0.patch
Attached a version of the patch that can applied to v1.4.0 source. The trunk
patch above assumes a couple of fixes made since v1.4.0.
> 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
> Attachments: one-pass-query-v1.4.0.patch, one-pass-query.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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