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https://issues.apache.org/jira/browse/FLINK-8306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316109#comment-16316109
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ASF GitHub Bot commented on FLINK-8306:
---------------------------------------
Github user pnowojski commented on a diff in the pull request:
https://github.com/apache/flink/pull/5200#discussion_r160107827
--- Diff:
flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java
---
@@ -770,8 +777,8 @@ public final void notifyCheckpointComplete(long
checkpointId) throws Exception {
return;
}
- final AbstractFetcher<?, ?> fetcher = this.kafkaFetcher;
- if (fetcher == null) {
+ final KafkaOffsetCommitter offsetCommitter =
this.kafkaOffsetCommitter;
--- End diff --
why do we need this `final` local variable? `kafkaOffsetCommitter` seems to
be "write-once" variable.
> FlinkKafkaConsumerBaseTest has invalid mocks on final methods
> -------------------------------------------------------------
>
> Key: FLINK-8306
> URL: https://issues.apache.org/jira/browse/FLINK-8306
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector, Tests
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Critical
> Fix For: 1.5.0, 1.4.1
>
>
> The {{FlinkKafkaConsumerBaseTest}} has invalid mocks on a final
> {{AbstractFetcher::commitInternalOffsetsToKafka(...)}} method. While an easy
> fix would be to simply make that method non-final, that is not ideal since it
> would be best that the method is left final to prevent overrides in
> subclasses.
> This suggests that offset committing functionality is too tightly coupled
> with the {{AbstractFetcher}}, making it hard to perform concise tests to
> verify offset committing.
> I suggest that we decouple record fetching and offset committing as separate
> services behind different interfaces. We should introduce a new interface,
> say {{KafkaOffsetCommitter}}, and test against that instead. Initially, we
> can simply let {{AbstractFetcher}} implement {{KafkaOffsetCommitter}}.
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