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Questions tagged [ksqldb]

ksqlDB: an event streaming database for Apache Kafka.

ksqlDB is a source-available event streaming database for Apache Kafka® developed by Confluent. It is distributed, scalable, reliable, and real-time. ksqlDB combines the power of real-time stream processing with the approachable feel of a relational database through a familiar, lightweight SQL syntax.

You can download ksqlDB at https://github.com/confluentinc/ksql

There is a quickstart at: https://ksqldb.io/quickstart.html

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KSQL left join giving 'null' result even when data is present

I'm learning K-SQL/KSQL-DB and currently exploring joins. Below is the issue where I'm stuck. I have 1 stream 'DRIVERSTREAMREPARTITIONEDKEYED' and one table 'COUNTRIES', below is their description. ksql> describe…
Omkar Rahane
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Apache Kafka Streams API vs KSQL

I'm want to learn about the differences between the two methods. I developed a project so It aggregates some data using Apache Kafka Streams API. And after that, I got on some solutions which are written with KSQL. I've never got experienced with…
Kadir Alan
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How to download Kafka in VM

I am trying to setup Kafka in vm (EC2 instance). I am trying to download with wget. But it is not downloading just not giving any error but downloading completed in just 2 seconds. If I check in folder (using ls) I am seeing like…
Sun
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KSQLDB StandAlone Deployment Returns Error "Connection could not be established. Broker may not be available"

broker/docker-compose.yml --- version: '2' services: zookeeper: image: confluentinc/cp-zookeeper:6.0.1 hostname: zookeeper container_name: zookeeper ports: - "2181:2181" environment: ZOOKEEPER_CLIENT_PORT: 2181 …
Saiful Islam
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Install Confluent Platform inside docker Ubuntu container on Windows 10

I am trying to install Confluent Platform on my Windows machine. As far as I know, installing Confluent Platform will give me access to KSQL which is not available in Apache Kafka package. The other hurdle is : KSQL can't run on windows directly, it…
Praveenks
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Can Kafka KSQL be used for real-time stream aggregations in a large IoT scenario

I'm trying to understand KSQL and whether it has the appropriate performance characteristics for our use case. Use Case Given Thousands of IoT connected devices sending telemetry data, have a service that aggregates, ranks and sorts that data into…
MonkeyBonkey
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kafka stream to ktable join

I am trying to join a KStream: created from a topic, the topic has JSON value. I re-key the stream using two attributed from the value. example value (snippet of the json). I created a custom pojo class and use a custom…
bp82
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KSQL Submitting multiple queries and keep it running

I am planning to use KSQL for stream processing. I have following requirements. Once query is set up I want to grab that output from query and send it as JSON to RabbitMQ. I have multiple users who will be creating criterias for query and I will be…
Ocean
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Need to convert the SQL Query to Gorm query

I have this SQL query Select CONCAT(kafka_user_stream.FirstName,' ', kafka_user_stream.LastName) AS "Full Name", kafka_user_stream.UID AS "User ID", kafka_user_stream.CountryCode AS "Country", kafka_user_stream.CreatedAt AS "Registration Date &…
Haseeb Asjad
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KSQL ( Confluent ) VS Hive Kafka SQL ( Hortanworks )

What are the difference ? which one is better ? when to use ? Hive Kafka SQL KSQL
sharan jain
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how to create different tables from a single topic in KSQL?

I have a Kafka topic which has customer, purchase, product etc data. I want to create different streams from this single topic.
P Singh
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