[IMPALA-2905] Use FragmentMgr to manage coordinator fragments

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Impala 2.5.0
• Fix Version/s: Impala 2.8.0
• Component/s: Distributed Exec
• Labels: query-lifecycle
• Target Version: Impala 2.8.0
• Assignee: Henry Robinson
• Reporter: Henry Robinson
• Created: 28/Jan/16 19:12
• Updated: 16/Oct/16 15:58
• Resolved: 16/Oct/16 15:58

Description

Impala's FragmentMgr manages all fragments except for the one run by the coordinator. We should remove the special-case code in Coordinator that requires this once IMPALA-1599 is finished, as that will allow us to start the coordinator fragment in parallel with the rest of the query.

Issue Links

• blocks: IMPALA-4268 buffer more than a batch of rows at coordinator