[IMPALA-7019] Discard block locations and schedule as remote read with erasure coding

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 3.1.0
• Fix Version/s: Impala 3.1.0
• Component/s: Frontend
• Epic Color: ghx-label-6
• Assignee: Tianyi Wang
• Reporter: Tianyi Wang
• Created: 12/May/18 00:17
• Updated: 22/Feb/19 17:24
• Resolved: 22/May/18 04:50

Description

Currently Impala schedules erasure coded scan in the same way as scheduling regular HDFS scan: it tries to schedule the scan on a datanode processing the block. This makes little sense with erasure coding so we should schedule it as if the block is remote.