Improve system tests for the mirroring code
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Key: KAFKA-215
URL: https://issues.apache.org/jira/browse/KAFKA-215
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 0.7
Reporter: Neha Narkhede
Priority: Critical
Fix For: 0.7.1
Improve the system tests for the mirroring code to *add* the following testing
scenarios -
1. Bounce the mirroring kafka cluster during the test
2. Add new topics to the source kafka cluster while the mirror is copying data
for existing topics
3. Bounce the source Kafka cluster during the test
The point of this improvement is to catch any bugs in the consumer rebalancing
or the detection of new topics logic. Also, verification code of this part of
the system test can report on the % of duplicates/ % data loss in the mirror
cluster. Since Kafka guarantees at least once delivery, small percentage of
duplicates is ok, but any amount of data loss is a critical bug
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