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https://issues.apache.org/jira/browse/KAFKA-8898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16950855#comment-16950855
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linking12 commented on KAFKA-8898:
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[~rachana_prajapati]
[https://stackoverflow.com/questions/48591163/high-memory-consumption-on-kafka-consumer]
my issues like this. Is some object can cached in mem?
> if there is no message for poll, kafka consumer also apply memory
> -----------------------------------------------------------------
>
> Key: KAFKA-8898
> URL: https://issues.apache.org/jira/browse/KAFKA-8898
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 2.1.1
> Reporter: linking12
> Priority: Blocker
> Labels: performance
> Attachments: image-2019-10-08-12-07-37-328.png
>
>
> when poll message, but there is no record,but consumer will apply 1000 byte
> memory;
> fetched = *new* HashMap<>() is not good idea, it will apply memory in heap
> but there is no message;
> I think fetched = *new* HashMap<>() will appear in records exist;
>
> ```
> *public* Map<TopicPartition, List<ConsumerRecord<K, V>>> fetchedRecords() {
> Map<TopicPartition, List<ConsumerRecord<K, V>>> fetched = *new*
> HashMap<>();
> *int* recordsRemaining = maxPollRecords;
> ```
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