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https://issues.apache.org/jira/browse/SOLR-12572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Amrit Sarkar updated SOLR-12572:
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Description:
Today while exporting result through "/export" handler,
{code:java}
http://localhost:8983/solr/core_name/export?q=my-query&sort=severity+desc,timestamp+desc&fl=severity,timestamp,msg
{code}
Doc-valued sought for all the {{sort}} fields defined. When we stream out docs
we again make doc-value seeks against the {{fl}} fields .
In most common use-cases we have {{fl = sort}} fields, or atleast the sort
fields are part of {{fl}}, so if we can pre-collect the values while sorting
it, we can reduce the doc-value seeks potentially bringing speed improvement.
was:
Today while exporting result through "/export" handler,
{code}
http://localhost:8983/solr/core_name/export?q=my-query&sort=severity+desc,timestamp+desc&fl=severity,timestamp,msg
{code}
Documents are sorted in priority queue, where doc-value sought for all the sort
fields defined. When we stream out docs we again make doc-value seeks against
the fl fields .
In most common use-cases we have fl = sort fields, or atleast the sort fields
are part of "fl", so if we can pre-collect the values while sorting it , we can
reduce the doc-value seeks potentially bringing speed improvement.
> Reuse fieldvalues computed while sorting at writing in ExportWriter
> -------------------------------------------------------------------
>
> Key: SOLR-12572
> URL: https://issues.apache.org/jira/browse/SOLR-12572
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Amrit Sarkar
> Assignee: Varun Thacker
> Priority: Minor
> Attachments: SOLR-12572.patch, SOLR-12572.patch
>
>
> Today while exporting result through "/export" handler,
> {code:java}
> http://localhost:8983/solr/core_name/export?q=my-query&sort=severity+desc,timestamp+desc&fl=severity,timestamp,msg
> {code}
> Doc-valued sought for all the {{sort}} fields defined. When we stream out
> docs we again make doc-value seeks against the {{fl}} fields .
> In most common use-cases we have {{fl = sort}} fields, or atleast the sort
> fields are part of {{fl}}, so if we can pre-collect the values while sorting
> it, we can reduce the doc-value seeks potentially bringing speed improvement.
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