[IMPALA-6190] Add a debug webpage to show fragment instances of a query

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Impala 2.12.0
• Component/s: Backend, Distributed Exec
• Labels: observability
• Epic Color: ghx-label-4
• Assignee: Lars Volker
• Reporter: Lars Volker
• Created: 15/Nov/17 23:43
• Updated: 07/May/18 23:46
• Resolved: 24/Jan/18 18:32

Description

Currently we display the list of backends and the number of fragment instances in the query debug webpage. We should augment that with the fragment instances per backend or display fragment instances on a new page.

Issue Links

• breaks: IMPALA-6450 Hit DCHECK in RuntimeProfile::EventSequence::Start()
• breaks: IMPALA-6824 Crash in RuntimeProfile::EventSequence::AddNewerEvents() when events_ is empty
• is depended upon by: IMPALA-6191 Show list of threads per query / fragment / instance