Geoff Anderson created KAFKA-2789:
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Summary: Update upgrade system test to catch issue reported in
KAFKA-2756
Key: KAFKA-2789
URL: https://issues.apache.org/jira/browse/KAFKA-2789
Project: Kafka
Issue Type: Bug
Reporter: Geoff Anderson
Assignee: Geoff Anderson
Fix For: 0.9.0.0
It's not good that the upgrade system test didn't catch KAFKA-2756
Hypothesis:
We think KAFKA-2756 would manifest as failed fetch requests, and replicas
falling out of ISR set.
However, the test only validates that acked messages are available for
consumption. It may be that some messages simply were not acked, but this is
not currently a failure condition for the test
Proposed update:
- Since every shutdown is a clean shutdown, and `min.insync.isr = 2`, we expect
that every message should be acked in this test. Update validation to confirm
this.
- Depending on how the leader moves during the rolling bounces, it might be
still be possible for every message to be acked even if replicas fall out of
isr. So we should also verify after each bounce that the size of the isr set
goes back to 3 in a short period of time.
When making this test update, we should check that the test fails if we remove
the fix to KAFKA-2756
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