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From Modassar Ather <modather1...@gmail.com>
Subject Re: Count of distinct values in faceting.
Date Tue, 11 Aug 2015 10:33:37 GMT
Please read docVlaues as docValues in my mail above.

Regards,
Modassar

On Tue, Aug 11, 2015 at 4:01 PM, Modassar Ather <modather1981@gmail.com>
wrote:

> Hi,
>
> Count of distinct values can be retrieved by following ways. Please note
> that the Solr version is 5.2.1.
> 1. Using cardinality=true.
> 2. Using hll() facet function.
>
> Kindly help me understand:
>  1. How accurate are them comparatively and better performance wise with
> millions of documents?
>  2. Per my understanding the {!cardinality=1.0} returns the most accurate
> result. Is my understanding correct and if yes is it 100% accurate?
>  3. How accurate result is returned by hll() function?
>  4. I am getting following exception for the query :
> q=field:query&stats=true&stats.field={!cardinality=1.0}field. The exception
> is not seen once the cardinality is set to 0.9 or less.
>     The field is docVlaues enabled and indexed=false. The same exception I
> tried to reproduce on non docVlaues field but could not. Please help me
> resolve the issue.
>  ERROR - 2015-08-11 12:24:00.222; [core]
> org.apache.solr.common.SolrException;
> null:java.lang.ArrayIndexOutOfBoundsException: 3
>         at
> net.agkn.hll.serialization.BigEndianAscendingWordSerializer.writeWord(BigEndianAscendingWordSerializer.java:152)
>         at
> net.agkn.hll.util.BitVector.getRegisterContents(BitVector.java:247)
>         at net.agkn.hll.HLL.toBytes(HLL.java:917)
>         at net.agkn.hll.HLL.toBytes(HLL.java:869)
>         at
> org.apache.solr.handler.component.AbstractStatsValues.getStatsValues(StatsValuesFactory.java:348)
>         at
> org.apache.solr.handler.component.StatsComponent.convertToResponse(StatsComponent.java:151)
>         at
> org.apache.solr.handler.component.StatsComponent.process(StatsComponent.java:62)
>         at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:255)
>         at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)
>         at org.apache.solr.core.SolrCore.execute(SolrCore.java:2064)
>         at
> org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:654)
>         at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:450)
>         at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)
>         at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)
>         at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
>         at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
>         at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
>         at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
>         at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
>         at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
>         at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
>         at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
>         at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
>         at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
>         at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)
>         at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)
>         at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
>         at org.eclipse.jetty.server.Server.handle(Server.java:497)
>         at
> org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)
>         at
> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
>         at
> org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)
>         at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
>         at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
>         at java.lang.Thread.run(Thread.java:745)
>
> Thanks,
> Modassar
>

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