[IMPALA-4572] COMPUTE STATS on Parquet tables uses MT_DOP=4 by default

• Type: Sub-task
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 2.8.0
• Fix Version/s: Impala 2.8.0
• Component/s: Frontend
• Labels: multithreading
• Target Version: Impala 2.8.0
• Assignee: Alexander Behm
• Reporter: Alexander Behm
• Created: 02/Dec/16 01:36
• Updated: 27/Jan/17 05:56
• Resolved: 04/Dec/16 05:02

Description

• COMPUTE STATS on Parquet tables should be run with MT_DOP=4 by default.
• COMPUTE STATS on non-Parquet tables will run without MT_DOP.
• Users can always override the behavior by setting MT_DOP manually. Setting MT_DOP to 0 means a statement will be run in the conventional execution mode (without intra-node paralellism based on multiple fragment instances)