Andrey created FLINK-6613:
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Summary: OOM during reading big messages from Kafka
Key: FLINK-6613
URL: https://issues.apache.org/jira/browse/FLINK-6613
Project: Flink
Issue Type: Bug
Affects Versions: 1.2.0
Reporter: Andrey
Steps to reproduce:
1) Setup Task manager with 2G heap size
2) Setup job that reads messages from Kafka 10 (i.e. FlinkKafkaConsumer010)
3) Send 3300 messages each 635Kb. So total size is ~2G
4) OOM in task manager.
According to heap dump:
1) KafkaConsumerThread read messages with total size ~1G.
2) Pass them to the next operator using
org.apache.flink.streaming.connectors.kafka.internal.Handover
3) Then began to read another batch of messages.
4) Task manager was able to read next batch of ~500Mb messages until OOM.
Expected:
1) Either have constraint like "number of messages in-flight" OR
2) Read next batch of messages only when previous batch processed OR
3) Any other option which will solve OOM.
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