[DISPATCH-1958] Qdstat throws exception when router compiled with `DQD_MEMORY_STATS=OFF`

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.15.0
• Fix Version/s: 1.18.0
• Component/s: Tools
• External issue URL: https://github.com/apache/qpid-dispatch/pull/696#issuecomment-773380031
• Assignee: Ganesh Murthy
• Reporter: Jiri Daněk
• Created: 12/Feb/21 12:15
• Updated: 19/Nov/21 21:43
• Resolved: 03/Nov/21 16:58

Description

From the README

    -DQD_MEMORY_STATS=
    ------------------

    Dispatch will track memory pool usage statistics if this is enabled.

So the statistics may not be always available, depending on the way Dispatch is compiled.

Allocator metrics get reported as 0. I see that qdmanage works just fine, but qdstat is throwing an error in such case:

$ qdstat -m
2021-02-04 15:08:19.288818 UTC
Standalone_v++jCPCjYiQcGo3

TypeError: unsupported operand type(s) for *: 'int32' and 'NoneType'

Found during PR review by fgiorget.