adding unit under load times out perf test

Bug #1626355 reported by Christopher Lee
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

Using an exploratory performance test that compares 1.25.6 against 2.0 we find that 1.25.6 passes while 2.0 times out when adding units.

The test in a nutshell does:
  - Bootstrap
  - Deploy peer-xplode charm [2]
  - In a loop:
     - Add a unit, wait for it to be 'started' and wait for the workload to be set (start hook sets this)
     - Do this for 20 units.
     (There is 2 flavors of this, add a single unit at a time until we have 20, and adding 2, 4, 6, then 8 units (again 20 total)).

This is the script used[1] and it's been run using lxd as the provider.

The charm used[2] is a slightly modified charm from John M that continuously fires off hooks.

With 1.25.6 we see the test complete (add 20 units in total).
With 2.0 we get a timeout (1200 seconds) while waiting for the workload to be set when we get to 6+ units.

The script is setup just like a CI test assess script so can be run like this:
  JUJU_HOME=~/cloud-city JUJU_REPOSITORY=../repository/ ./ parallel-lxd /path/to/juju/binary /path/to/log-result/dir <some identifier name, i.e. perf-test>


tags: added: perfscale-test
Changed in juju:
status: New → Triaged
importance: Undecided → High
milestone: none → 2.0.1
Curtis Hovey (sinzui)
Changed in juju:
milestone: 2.0.1 → none
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