[IMPALA-3817] Runtime filters running on a cluster with heterogeneous HW can lead to wrong results

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: Impala 2.5.0
• Fix Version/s: Impala 2.7.0
• Component/s: Backend
• Labels: correctness runtime-filters scalability
• Target Version: Impala 2.7.0
• Assignee: Jim Apple
• Reporter: Mostafa Mokhtar
• Created: 01/Jul/16 21:57
• Updated: 06/Sep/16 16:54
• Resolved: 12/Jul/16 20:47

Description

BloomFilter use CRC hashing when running on processors which support SSE, if the bloom filter is populated on a node which supports SSE and applied on a node which doesn't this can produce incorrect results.

This is a hypothetical scenario.
Users can have a mix of EC2 instance types in a cluster, yet differences are more likely to be around AVX2 rather than SSE.