[IMPALA-5676] BufferedTupleStreamV2::CheckConsistency() is too slow for large streams with small pages in Debug build

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.10.0
• Fix Version/s: Impala 2.10.0
• Component/s: Backend
• Target Version: Impala 2.10.0
• Epic Color: ghx-label-5
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 18/Jul/17 15:26
• Updated: 24/Jul/17 00:28
• Resolved: 24/Jul/17 00:28

Description

I saw a spilling query (with a bad plan) spending a huge amount of time in this function.

We should probably split out the O parts of CheckConsistency() into a separate function that is run less frequently, e.g. once per pass over the stream.