[KAFKA-8898] if there is no message for poll, kafka consumer also apply memory

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Affects Version/s: 2.1.1
• Component/s: consumer
• Labels: performance
• Assignee: Unassigned
• Reporter: linking12
• Created: 11/Sep/19 09:16
• Updated: 16/May/20 12:10

Description

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;

```