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https://issues.apache.org/jira/browse/SOLR-13494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-13494:
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Summary: Improve the performance of distributed random sampling (was:
Improve the performance of random sampling)
> Improve the performance of distributed random sampling
> ------------------------------------------------------
>
> Key: SOLR-13494
> URL: https://issues.apache.org/jira/browse/SOLR-13494
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
>
> Currently the *random* Streaming Expression performs a conventional
> distributed search. This involves retrieving the top N docs from each shard
> and then selecting the top N from all the shards in the aggregator node. This
> technique eventually bogs down as the number of shards goes up and/or N goes
> up.
> Selecting distributed random samples does not actually require this behavior.
> Instead you can select N/numShards from each shard and simply return all
> results. This technique will actually get faster as more shards are added
> instead of slowing down.
> This ticket will allow the random Streaming Expression to use the strategy
> above when N reaches a certain threshold (ie 10000).
>
>
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