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https://issues.apache.org/jira/browse/SOLR-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715188#comment-14715188
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ASF subversion and git services commented on SOLR-7954:
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Commit 1697977 from hoss...@apache.org in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1697977 ]
SOLR-7954: Fixed an integer overflow bug in the HyperLogLog code used by the
'cardinality' option of stats.field to prevent ArrayIndexOutOfBoundsException
in a distributed search when a large precision is selected and a large number
of values exist in each shard (merge r1697969)
> 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, 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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