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https://issues.apache.org/jira/browse/SPARK-25151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16584492#comment-16584492
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Apache Spark commented on SPARK-25151:
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User 'HeartSaVioR' has created a pull request for this issue:
https://github.com/apache/spark/pull/22138
> Apply Apache Commons Pool to KafkaDataConsumer
> ----------------------------------------------
>
> Key: SPARK-25151
> URL: https://issues.apache.org/jira/browse/SPARK-25151
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.4.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> KafkaDataConsumer contains its own logic for caching InternalKafkaConsumer
> which looks like can be simplified via applying Apache Commons Pool. Benefits
> of applying Apache Commons Pool are following:
> * We can get rid of synchronization of KafkaDataConsumer object while
> acquiring and returning InternalKafkaConsumer.
> * We can extract the feature of object pool to outside of the class, so that
> the behaviors of the pool can be tested easily. Now it doesn't have detailed
> tests and only covers reported issues.
> * We can get various statistics for the object pool, and also be able to
> enable JMX for the pool.
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