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https://issues.apache.org/jira/browse/SOLR-7954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14710599#comment-14710599
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Modassar Ather commented on SOLR-7954:
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To add to the summary and description.
I changed the {noformat}doc.addField("colid", "val!"+i+"!-"+"ref"+i);{noformat}
to {noformat}doc.addField("colid", "val"+i+"!-"+"ref"+i);{noformat}
The documents got distributed to all the nodes. I indexed 1 million documents
and was able to reproduce the issue. All the shards had around 200000 documents
each.
Later I indexed 400000 documents on which I could not reproduce it. All the
shards had around 100000 documents each.
There are 4 shards with no replica on my test environment.
> 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
>
>
> 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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