FlinkKafkaConsumer010 - Memory Issue
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FlinkKafkaConsumer010 - Memory Issue
 
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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
Best Regards,
Pedro Chaves |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hi, Gordon (in CC) knows the details of Flink's Kafka consumer. He might know how to solve this issue. 2017-07-19 20:23 GMT+02:00 PedroMrChaves <[hidden email]>: Hello, |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hi Pedro, Seems like a memory leak. The only issue I’m currently aware of that may be related is [1]. Could you tell if this JIRA relates to what you are bumping into? The JIRA mentions Kafka 09, but a fix is only available for Kafka 010 once we bump our Kafka 010 dependency to the latest version. If that doesn’t relate to you, please let me know and I'll investigate a bit more. Cheers, Gordon [1] https://issues.apache.org/jira/browse/FLINK-6301 On 20 July 2017 at 3:14:57 AM, Fabian Hueske ([hidden email]) wrote:
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Re: FlinkKafkaConsumer010 - Memory Issue
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In reply to this post by PedroMrChaves
Hi,
From the log, it doesn't seem that the task manager use a lot of memory. Can you post the output of top. Regards, Kien On 7/20/2017 1:23 AM, PedroMrChaves wrote: > 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 > -- > View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/FlinkKafkaConsumer010-Memory-Issue-tp14342.html > Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com. |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hello,
Thank you for the reply. The problem is not that the task manager uses a lot of memory, the problem is that every time I cancel and re-submit the Job the task manager does not release the previously allocated memory. Regards, Pedro Chaves.
Best Regards,
Pedro Chaves |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hi, I couldn’t seem to reproduce this. Taking another look at your description, one thing I spotted was that your Kafka broker installation versions are 0.10.1.0, while the Kafka consumer uses Kafka clients of version 0.10.0.1 (by default, as shown in your logs). I’m wondering whether or not that could be the root cause here.Cheers, Gordon
On 26 July 2017 at 12:14:02 AM, PedroMrChaves ([hidden email]) wrote:
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Re: FlinkKafkaConsumer010 - Memory Issue
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In reply to this post by PedroMrChaves
Hi Pedro,
As long as there's no OutOfMemoryError/long garbage collection pause, there's nothing to worry about keeping memory allocated. The memory should be garbage-collected by the JVM when necessary. Regards, Kien On 7/25/2017 10:53 PM, PedroMrChaves wrote: > Hello, > > Thank you for the reply. > > The problem is not that the task manager uses a lot of memory, the problem > is that every time I cancel and re-submit the Job the task manager does not > release the previously allocated memory. > > Regards, > Pedro Chaves. > > > > ----- > Best Regards, > Pedro Chaves > -- > View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/FlinkKafkaConsumer010-Memory-Issue-tp14342p14445.html > Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com. |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hi Pedro!
Can you make a heap dump after a few re-submissions and share a screenshot or so showing which memory piles up? Is it the buffer memory from the Kafka Producer or Consumer? Stephan On Wed, Jul 26, 2017 at 8:11 AM, Kien Truong <[hidden email]> wrote: Hi Pedro, |
Re: FlinkKafkaConsumer010 - Memory Issue
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Hello,
Sorry for the delay. The buffer memory of the Kafka consumer was piling up. Once I updated to the 1.3.2 version the problem no longer occurred. Pedro. ----- Best Regards, Pedro Chaves -- Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/
Best Regards,
Pedro Chaves |
Re: FlinkKafkaConsumer010 - Memory Issue
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Thanks for letting us know!
> On 18. Sep 2017, at 11:36, PedroMrChaves <[hidden email]> wrote: > > Hello, > > Sorry for the delay. > > The buffer memory of the Kafka consumer was piling up. Once I updated to the > 1.3.2 version the problem no longer occurred. > > Pedro. > > > > ----- > Best Regards, > Pedro Chaves > -- > Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/ |
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