[IMPALA-6957] Include number of required threads in explain plan

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Not Applicable
• Fix Version/s: Impala 2.13.0, Impala 3.1.0
• Component/s: Frontend
• Labels: resource-management
• Target Version: Product Backlog
• Epic Color: ghx-label-7
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 01/May/18 01:41
• Updated: 16/May/18 23:51
• Resolved: 16/May/18 23:51

Description

Impala has an internal notion of "required threads" to execute a fragment, e.g. the fragment execution thread and the first scanner thread. It's possible to compute the number of required threads per fragment instance based on the plan.

We should include this in the resource profile and expose it in the explain plan. This could then be a step toward implementing something like IMPALA-6035.

Issue Links

• is depended upon by: IMPALA-6035 Add query option that rejects queries based on query complexity