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https://issues.apache.org/jira/browse/SOLR-6968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-6968:
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Attachment: SOLR-6968.patch
Updated patch now includes an "HllOptions" class w/tests for parsing various
knobs for tunning...
* {{cardinality=true}} and {{cardinality=false}} still supported for basic
defaults
* can also specify huerstic based {{cardinality=N}} where N is a number between
0.0 and 1.0 inclusive indicating how much accuracy you care about
** 0 == minimum accuracy, conserve as much ram as possible
** 1.0 == maximum accuracy, spend as much ram as possible
** {{cardinality=true}} roughly the same as {{cardinality=0.33}}
* additional advanced local params for overriding the hueristic based on a
knowledge of HLL:
** {{hllLog2m=N}} (raw int passed to HLL API)
** {{hllRegwidth=N}} (raw int passed to HLL API)
** "hll" param prefix choosen based on implementation details similar to how
{{percentiles}} supports {{tdigestCompression}}
*** if/when we change the implementation details of how we compute cardinality,
these can be ignored and new tunning options can be introduced.
* {{hllPreHashed=BOOL}}
** only works with Long based fields (by design)
> add hyperloglog in statscomponent as an approximate count
> ---------------------------------------------------------
>
> Key: SOLR-6968
> URL: https://issues.apache.org/jira/browse/SOLR-6968
> Project: Solr
> Issue Type: Sub-task
> Reporter: Hoss Man
> Attachments: SOLR-6968.patch, SOLR-6968.patch, SOLR-6968.patch,
> SOLR-6968.patch
>
>
> stats component currently supports "calcDistinct" but it's terribly
> inefficient -- especially in distib mode.
> we should add support for using hyperloglog to compute an approximate count
> of distinct values (using localparams via SOLR-6349 to control the precision
> of the approximation)
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