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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7954) ArrayIndexOutOfBoundsException from distributed HLL serialization logic when using using stats.field={!cardinality=1.0} in a distributed query
Date Wed, 26 Aug 2015 17:24:45 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715188#comment-14715188
] 

ASF subversion and git services commented on SOLR-7954:
-------------------------------------------------------

Commit 1697977 from hossman@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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