Hello,
Whenever I submit a job to Flink that retrieves data from Kafka the memory
consumption continuously increases. I've changed the max heap memory from
2gb, to 4gb, even to 6gb but the memory consumption keeps reaching the
limit.
An example of a simple Job that shows this behavior is depicted bellow.
/ /*
* Execution Environment Setup
*/
final StreamExecutionEnvironment environment =
getGlobalJobConfiguration(configDir, configurations);
/**
* Collect event data from Kafka
*/
DataStreamSource<String> s = environment.addSource(new
FlinkKafkaConsumer010<String>(
configurations.get(ConfigKeys.KAFKA_INPUT_TOPIC),
new SimpleStringSchema(),
getKafkaConfiguration(configurations)));
s.filter(new FilterFunction<String>() {
@Override
public boolean filter(String value) throws Exception {
return false;
}
}).print();
private static Properties getKafkaConfiguration(ParameterTool
configurations) {
Properties properties = new Properties();
properties.setProperty("bootstrap.servers",
configurations.get(ConfigKeys.KAFKA_HOSTS));
properties.put("group.id",
"flink-consumer-"+UUID.randomUUID().toString());
properties.put("value.deserializer",
"org.apache.kafka.common.serialization.StringDeserializer");
properties.put("security.protocol",
configurations.get(ConfigKeys.KAFKA_SECURITY_PROTOCOL));
properties.put("ssl.truststore.location",
configurations.get(ConfigKeys.KAFKA_SSL_TRUSTSTORE_LOCATION));
properties.put("ssl.truststore.password",
configurations.get(ConfigKeys.KAFKA_SSL_TRUSTSTORE_PASSWORD));
properties.put("ssl.keystore.location",
configurations.get(ConfigKeys.KAFKA_SSL_KEYSTORE_LOCATION));
properties.put("ssl.keystore.password",
configurations.get(ConfigKeys.KAFKA_SSL_KEYSTORE_PASSWORD));
return properties;
}
/
Moreover, when I stop the job, the task manager does not terminate the kafka
connection and the memory is kept allocated. To stop this, I have to kill
the task manager process.
*My Flink version: 1.2.1
Kafka consumer: 010
Kafka version: 2_11_0.10.1.0-2*
I've activated the /taskmanager.debug.memory.startLogThread/ property to
output for every 5 seconds and attached the log with the results.
The output of free -m before submitting the job:
/ total used free shared buff/cache
available
Mem: 15817 245 14755 24 816
15121
Swap: 0 0 0/
after having the job running for about 5 min:
free -m
/ total used free shared buff/cache
available
Mem: 15817 9819 5150 24 847
5547
Swap: 0 0 0
/
taskmanager.log
<http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/file/n14342/taskmanager.log>
-----
Best Regards,
Pedro Chaves
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