All GET or HEAD requests consistently error limit nodes that return 507
and increment errors for nodes responding with any other 5XX.
There were two places in the object PUT path where the proxy was error
limiting nodes and their behavior was inconsistent. During expect-100
connect we would only error_limit nodes on 507, and during response we
would increment errors for all 5XX series responses. This was pretty
hard to reason about and the divergence in behavior of questionable
value.
An audit of base controller highlighted where make_requests would apply
error_limit's on 507 but not increment errors on other 5XX responses.
Now anywhere we track errors on nodes we use error_limit on 507 and
error_occurred on any other 5XX series request. Additionally a Timeout
or Exception that is logged through exception_occurred will bump errors -
which is consistent with the approach in "Add Error Limiting to slow
nodes" [1].
1. https://review.openstack.org/#/c/112424/
Change-Id: I67e489d18afd6bdfc730bfdba76f85a2e3ca74f0
99d501831e