[IMPALA-5166] Clean up BufferPool profile counters

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.9.0
• Fix Version/s: Impala 2.9.0
• Component/s: Backend
• Target Version: Impala 2.9.0
• Epic Color: ghx-label-9
• Assignee: Tim Armstrong
• Reporter: Tim Armstrong
• Created: 04/Apr/17 23:07
• Updated: 22/May/17 15:01
• Resolved: 22/May/17 15:01

Description

We should clean-up the profile counters that are added to each node so that irrelevant info is hidden and relevant info is easy to find:

• Hide the limit if it is MAX_INT64
• Remove the BufferPool prefix and move into a "Buffer pool" section, or similar
• Remove or rename potentially confusing counters, e.g.
  • the cumulative allocation counters should be removed or renamed to be clearer that they are cumulative
  • PeakUnpinnedBytes is confusing unless you understand the internals