[jira] [Resolved] (FLINK-6613) OOM during reading big messages from Kafka

["Andrey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey resolved FLINK-6613.
---------------------------
    Resolution: Not A Bug

I was able to setup "fetch.max.bytes" property and limit number of incoming message. This solved the problem

> OOM during reading big messages from Kafka
> ------------------------------------------
>
>                 Key: FLINK-6613
>                 URL: https://issues.apache.org/jira/browse/FLINK-6613
>             Project: Flink
>          Issue Type: Bug
>          Components: Kafka Connector
>    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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