[SOLR-7954] ArrayIndexOutOfBoundsException from distributed HLL serialization logic when using using stats.field={!cardinality=1.0} in a distributed query

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.2.1
• Fix Version/s: 5.4, 6.0

Environment

SolrCloud 4 node cluster.
Ubuntu 12.04
OS Type 64 bit

• Assignee: Chris M. Hostetter
• Reporter: Modassar Ather
• Created: 21/Aug/15 06:02
• Updated: 09/May/16 18:44
• Resolved: 27/Aug/15 20:31

Description

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.

Issue Links

• links to: Upstream bug report #17