[jira] [Created] (FLINK-7195) FlinkKafkaConsumer should not respect fetched partitions to filter restored partition states

["Tzu-Li (Gordon) Tai (JIRA)" <ji...@apache.org>]

Tzu-Li (Gordon) Tai created FLINK-7195:
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             Summary: FlinkKafkaConsumer should not respect fetched partitions to filter restored partition states
                 Key: FLINK-7195
                 URL: https://issues.apache.org/jira/browse/FLINK-7195
             Project: Flink
          Issue Type: Bug
          Components: Kafka Connector
    Affects Versions: 1.3.1
            Reporter: Tzu-Li (Gordon) Tai
            Assignee: Tzu-Li (Gordon) Tai
            Priority: Blocker
             Fix For: 1.3.2


This issue is a re-appearance of FLINK-6006. On restore, we should not respect any fetched partitions list from Kafka and perform any filtering of the restored partition states. There are corner cases where, due to Kafka broker downtime, some partitions may be missing in the fetched partition list. To be more precise, we actually should not require fetching partitions on restore.

We've stepped on our own foot again and reintroduced this bug in https://github.com/apache/flink/pull/3378/commits/ed68fedbe90db03823d75a020510ad3c344fa73e. The previous test for this behavior was too implementation specific, and therefore the leak in catching this on different internal implementations.
We should have a proper unit test for this that does not rely on the internal implementations and test only on public abstractions of {{FlinkKafkaConsumerBase}}.



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