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Kafka: consume all messages on demand


Kafka: consume all messages on demand

By : user2187132
Date : November 26 2020, 04:01 AM
I wish this helpful for you A Kafka topics basically materializes an infinite stream of events.
So when to stop when consuming from a topic? How do you know you reached the end? The short answer is you don't! In theory a producer could always send a new message to the topic.
code :


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Consume Kafka Avro messages in go

Consume Kafka Avro messages in go


By : Daniel Williams
Date : March 29 2020, 07:55 AM
To fix the issue you can do Just found out (by comparing binary avro messages) that I had to remove the first 5 elements of the message byte array - now everything works :)
code :
message = msg.Value[5:]
Can't Consume JSON Messages From Kafka Using Kafka-Python's Deserializer

Can't Consume JSON Messages From Kafka Using Kafka-Python's Deserializer


By : Beth
Date : March 29 2020, 07:55 AM
To fix the issue you can do It turns out the problem is the decode portion of value_deserializer=lambda m: json.loads(m).decode('utf-8') when I change it to value_deserializer=lambda m: json.loads(m) then I see the type of object being read from Kafka is now a dictionary. Which based on the following information from python's JSON documentation is correct:
code :
|---------------------|------------------|
|       JSON          |     Python       |
|---------------------|------------------|
|      object         |      dict        |
|---------------------|------------------|
|      array          |      list        |
|---------------------|------------------|
|      string         |      unicode     |
|---------------------|------------------|
|      number (int)   |      int, long   |
|---------------------|------------------|
|      number (real)  |      float       |
|---------------------|------------------|
|      true           |      True        |
|---------------------|------------------|
|      false          |      False       |
|---------------------|------------------|
|      null           |      None        |
|---------------------|------------------|
kafka to consume only new messages

kafka to consume only new messages


By : Bowei Chen
Date : March 29 2020, 07:55 AM
this one helps. My spark streaming job is consuming data from Kafka , There is two ways you can achieve this:
Consume live messages in Kafka

Consume live messages in Kafka


By : J2J
Date : March 29 2020, 07:55 AM
help you fix your problem I have started my zookeeper and Kafka server. I started my Kafka producer which sends 10 messages with topic 'xxx'. Then stopped my Kafka producer. Now I started my Kafka consumer and subscribed with topic 'xxx'. My consumer consumes those 10 messages sent by my Kafka producer, which is not running now. I need my Kafka consumer should only consume messages from running Kafka server. Is there any way to achieve this ? Following things in my consumer properties. , Set the following property :
How to filter Kafka messages before consumer consume in spring Kafka

How to filter Kafka messages before consumer consume in spring Kafka


By : Bellal Hossain
Date : March 29 2020, 07:55 AM
I hope this helps . Yes in spring Kafka you can filter messages before consumer consumes, there is an interface public interface RecordFilterStrategy and method in interface boolean filter(org.apache.kafka.clients.consumer.ConsumerRecord consumerRecord)
so you need to override this filter method and if it returns false consumer will consume the message, and if it return true message will not consume
code :
consumerRecord.key() // will return key of message
consumerRecord.value() // will return the message
 @Bean(name = "kafkaListenerContainerFactory")
public ConcurrentKafkaListenerContainerFactory<String, String> kafkaListenerContainerFactory() {
    ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<>();
    factory.setConcurrency(Integer.parseInt(threads));
    factory.setBatchListener(true);
    factory.setConsumerFactory(kafkaConsumerFactory());
    factory.getContainerProperties().setPollTimeout(Long.parseLong(pollTimeout));
    factory.getContainerProperties().setAckMode(AbstractMessageListenerContainer.AckMode.BATCH);

    if(true) {
        factory.setRecordFilterStrategy(new RecordFilterStrategy<String, String>() {

            @Override
            public boolean filter(ConsumerRecord<String, String> consumerRecord) {
                if(consumerRecord.key().equals("ETEST")) {
                return false;
                }
            else {
                return true;
                 }
            }   
        });
    }

    return factory;
}
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