[IMPALA-5684] Use gtest's sharding support to parallelise long-running be-tests

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 2.9.0
• Component/s: Infrastructure
• Epic Color: ghx-label-5
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 19/Jul/17 19:01
• Updated: 25/Oct/17 23:11

Description

Googletest has support for sharding test cases from a single test across different processes. We could use this to speed up the execution of some backend tests - particularly expr-test.

The runtime of each expr-test is heavily skewed, but once we have sharding we can make the test cases a bit more fine-grained and then automatically get better performance as the sharding handles the work balancing.