Kafka Streams application opening too many files on kafka servers









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I've been working on an application based on the java kafka-streams API, whose goal is to process a stream of data coming from one kafka topic, and produce it into another topic.



As it seems, whenever I start producing messages using the kafka-streams application, file handles just keep opening on the kafka brokers I'm using, and they are never closed, meaning eventually the kafka server ends up with too many open files, and the kafka and zookeeper daemons crash.



I'm using kafka-streams-1.0.1 API jar for Java, and running on JDK 11. The kafka cluster is of Kafka version 1.0.0.



My application's configuration includes the following kafka producer configs:




  • batch.size: set to 100,000 messages.


  • linger.ms: set to 1,000 milliseconds.


  • buffer.memory: set to the byte equivalent of 5 MegaBytes.

The stream processing itself is very simple, and is composed:



stream.map((k,v) -> handle(k,v)).filter((k,v) -> v != null).to(outgoingTopic);


I would appreciate any suggestions you guys might have.






java apache-kafka apache-kafka-streams







share|improve this question





















  • The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
    – daniu
    yesterday











  • And it is configured to that level. Still, files keep opening
    – Stav Saad
    yesterday










  • I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
    – cricket_007
    yesterday










  • Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
    – Stav Saad
    18 hours ago














up vote
0
down vote

favorite












I've been working on an application based on the java kafka-streams API, whose goal is to process a stream of data coming from one kafka topic, and produce it into another topic.



As it seems, whenever I start producing messages using the kafka-streams application, file handles just keep opening on the kafka brokers I'm using, and they are never closed, meaning eventually the kafka server ends up with too many open files, and the kafka and zookeeper daemons crash.



I'm using kafka-streams-1.0.1 API jar for Java, and running on JDK 11. The kafka cluster is of Kafka version 1.0.0.



My application's configuration includes the following kafka producer configs:




  • batch.size: set to 100,000 messages.


  • linger.ms: set to 1,000 milliseconds.


  • buffer.memory: set to the byte equivalent of 5 MegaBytes.

The stream processing itself is very simple, and is composed:



stream.map((k,v) -> handle(k,v)).filter((k,v) -> v != null).to(outgoingTopic);


I would appreciate any suggestions you guys might have.






java apache-kafka apache-kafka-streams







share|improve this question





















  • The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
    – daniu
    yesterday











  • And it is configured to that level. Still, files keep opening
    – Stav Saad
    yesterday










  • I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
    – cricket_007
    yesterday










  • Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
    – Stav Saad
    18 hours ago












up vote
0
down vote

favorite









up vote
0
down vote

favorite











I've been working on an application based on the java kafka-streams API, whose goal is to process a stream of data coming from one kafka topic, and produce it into another topic.



As it seems, whenever I start producing messages using the kafka-streams application, file handles just keep opening on the kafka brokers I'm using, and they are never closed, meaning eventually the kafka server ends up with too many open files, and the kafka and zookeeper daemons crash.



I'm using kafka-streams-1.0.1 API jar for Java, and running on JDK 11. The kafka cluster is of Kafka version 1.0.0.



My application's configuration includes the following kafka producer configs:




  • batch.size: set to 100,000 messages.


  • linger.ms: set to 1,000 milliseconds.


  • buffer.memory: set to the byte equivalent of 5 MegaBytes.

The stream processing itself is very simple, and is composed:



stream.map((k,v) -> handle(k,v)).filter((k,v) -> v != null).to(outgoingTopic);


I would appreciate any suggestions you guys might have.






java apache-kafka apache-kafka-streams







share|improve this question













I've been working on an application based on the java kafka-streams API, whose goal is to process a stream of data coming from one kafka topic, and produce it into another topic.



As it seems, whenever I start producing messages using the kafka-streams application, file handles just keep opening on the kafka brokers I'm using, and they are never closed, meaning eventually the kafka server ends up with too many open files, and the kafka and zookeeper daemons crash.



I'm using kafka-streams-1.0.1 API jar for Java, and running on JDK 11. The kafka cluster is of Kafka version 1.0.0.



My application's configuration includes the following kafka producer configs:




  • batch.size: set to 100,000 messages.


  • linger.ms: set to 1,000 milliseconds.


  • buffer.memory: set to the byte equivalent of 5 MegaBytes.

The stream processing itself is very simple, and is composed:



stream.map((k,v) -> handle(k,v)).filter((k,v) -> v != null).to(outgoingTopic);


I would appreciate any suggestions you guys might have.






java apache-kafka apache-kafka-streams




java apache-kafka apache-kafka-streams






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked yesterday









Stav Saad

541413




541413











  • The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
    – daniu
    yesterday











  • And it is configured to that level. Still, files keep opening
    – Stav Saad
    yesterday










  • I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
    – cricket_007
    yesterday










  • Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
    – Stav Saad
    18 hours ago
















  • The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
    – daniu
    yesterday











  • And it is configured to that level. Still, files keep opening
    – Stav Saad
    yesterday










  • I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
    – cricket_007
    yesterday










  • Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
    – Stav Saad
    18 hours ago















The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
– daniu
yesterday





The recommendation by Confluent is to configure the kernel of the host to allow 100.000+ open file handles. Normally the default is way below that.
– daniu
yesterday













And it is configured to that level. Still, files keep opening
– Stav Saad
yesterday




And it is configured to that level. Still, files keep opening
– Stav Saad
yesterday












I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
– cricket_007
yesterday




I don't think Java 11 is officially supported by Kafka community, or officially tested. Not sure if that's the problem, though
– cricket_007
yesterday












Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
– Stav Saad
18 hours ago




Java 11 is used as the runtime of my own application and should not affect stuff happening on the Kafka servers
– Stav Saad
18 hours ago

















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