multiregionccl: improve and deflake TestMultiRegionDataDriven #86339
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ajwerner
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complete! 1 of 0 LGTMs obtained (waiting on @rafiss)
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This patch switches to printing the entire trace instead of an opaque failure if the trace analysis does not conform to the expected output. We also deflake this test. The framework allows for tests to express an expected leaseholder and wait for these changes to apply. Given the test cluster interface, the only claim that can be made here is that the outgoing leaseholder has applied the lease transfer. Other replicas may still be operating under a stale view of the lease. The "served via follower read" test output line is contingent on the serving replicas view of the lease. I think this was leading to some (but maybe not all) flakes we've seen sporadically. To get around this, we now wait for all replicas to have the same view of the leaseholder when waiting for zone config changes to apply. Release justification: non production code change Release note: None
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fixes #77908
fixes #80837
This patch switches to printing the entire trace instead of an opaque
failure if the trace analysis does not conform to the expected output.
We also deflake this test. The framework allows for tests to express
an expected leaseholder and wait for these changes to apply. Given the
test cluster interface, the only claim that can be made here is that
the outgoing leaseholder has applied the lease transfer. Other replicas
may still be operating under a stale view of the lease. The
"served via follower read" test output line is contingent on the serving
replicas view of the lease. I think this was leading to some (but maybe
not all) flakes we've seen sporadically. To get around this, we now wait
for all replicas to have the same view of the leaseholder when waiting
for zone config changes to apply.
Release justification: non production code change
Release note: None