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https://issues.apache.org/jira/browse/SOLR-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-7954:
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Attachment: SOLR-7954.patch
Tracked down the root problem to some integer overflow - the HLL code was
multiplying 2 large integers (w/o casting them individual to longs first) then
assigning the (already overflowed) value to a long.
attached patch includes fix, but i want to work on randomizing the test some
more -- make sure there aren't similar bugs in other code paths.
> ArrayIndexOutOfBoundsException from distributed HLL serialization logic when
> using using stats.field={!cardinality=1.0} in a distributed query
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-7954
> URL: https://issues.apache.org/jira/browse/SOLR-7954
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.2.1
> Environment: SolrCloud 4 node cluster.
> Ubuntu 12.04
> OS Type 64 bit
> Reporter: Modassar Ather
> Assignee: Hoss Man
> Attachments: SOLR-7954.patch, SOLR-7954.patch
>
>
> User reports indicate that using {{stats.field=\{!cardinality=1.0\}foo}} on a
> field that has extremely high cardinality on a single shard (example: 150K
> unique values) can lead to "ArrayIndexOutOfBoundsException: 3" on the shard
> during serialization of the HLL values.
> using "cardinality=0.9" (or lower) doesn't produce the same symptoms,
> suggesting the problem is specific to large log2m and regwidth values.
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