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---
---
<!DOCTYPE html>
<html>
<head>
{% include vendors.html %}
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="description" content="{{ site.description }}">
<meta class="swiftype" name="site-id" data-type="integer" content="3" />
<meta class="swiftype" name="docs-boost" data-type="integer" content="6" />
<title>{{ site.title }}</title>
<link rel="stylesheet" href="{{ "/assets/sass/fonts.css" | relative_url }}" />
<link rel="stylesheet" href="{{ "/assets/sass/main.css" | relative_url }}" />
<link rel="preconnect" href="https://developer.confluent.io" crossorigin/>
<link rel="preconnect" href="https://reveal.clearbit.com" crossorigin/>
<link rel="preload" as="image" type='image/svg+xml' href="https://developer.confluent.io/images/developer-logo.svg" />
<script src="https://reveal.clearbit.com/v1/companies/reveal?authorization=pk_3b8bb5ef85b03b3e0d9bd2165914fee4&variable=reveal"></script>
<script src="https://cdn.optimizely.com/js/15784060578.js"></script>
<script>
!function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","debug","page","once","off","on","addSourceMiddleware","addIntegrationMiddleware","setAnonymousId","addDestinationMiddleware"];analytics.factory=function(e){return function(){var t=Array.prototype.slice.call(arguments);t.unshift(e);analytics.push(t);return analytics}};for(var e=0;e<analytics.methods.length;e++){var key=analytics.methods[e];analytics[key]=analytics.factory(key)}analytics.load=function(key,e){var t=document.createElement("script");t.type="text/javascript";t.async=!0;t.src="https://cdn.segment.com/analytics.js/v1/" + key + "/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(t,n);analytics._loadOptions=e};analytics._writeKey="az10o8Nrc5rgWtPla1QHrg1rTjPdYFV6";analytics.SNIPPET_VERSION="4.13.2";
analytics.load("az10o8Nrc5rgWtPla1QHrg1rTjPdYFV6");
analytics.page();
}}();
</script>
<script src="assets/js/feedback.js"></script>
</head>
<body class="pg-main">
{% include nav.html %}
{% include feedback-button.html %}
<section class="hero">
<div class="hero-body">
<div class="container">
<div class="headline">
<h1>
Say Hello World to Stream Processing
</h1>
<h2 class="subtitle">From Idea to Proof-of-concept: Learn Apache Kafka® and Apache Flink® fundamentals quickly with our functional tutorials, then explore the most popular stream processing use cases with recipes powered by ksqlDB so you can take immediate action, 100% in the cloud. <a href="https://www.confluent.io/confluent-cloud/tryfree/">Get started here</a></h2>
<div class="ctas">
<a href="{{ "/index.html" | relative_url }}" class="btn-midnight-white-outline">Concepts</a>
<a href="{{ "/use-cases.html" | relative_url }}" class="btn-midnight">Use Case Recipes</a>
</div>
</div>
</div>
</div>
</section>
<div class="cards-container">
<div class="cards">
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-flink.png" | relative_url }}" />
<div>Flink SQL</div>
<!-- Building event streaming applications with Flink SQL-->
</div>
<ul>
<li><a href="{{ "/create-stateful-aggregation-count/flinksql.html" | relative_url }}">Aggregations: counting</a></li>
<li><a href="{{ "/create-stateful-aggregation-minmax/flinksql.html" | relative_url }}">Aggregations: min-max</a></li>
<li><a href="{{ "/join-a-stream-to-a-stream/flinksql.html" | relative_url }}">Temporal joins</a></li>
<li><a href="{{ "/filter-a-stream-of-events/flinksql.html" | relative_url }}">Filtering</a></li>
<li><a href="{{ "/create-tumbling-windows/flinksql.html" | relative_url }}">Tumbling windows</a></li>
<li><a href="{{ "/create-hopping-windows/flinksql.html" | relative_url }}">Hopping windows</a></li>
<li><a href="{{ "/create-cumulating-windows/flinksql.html" | relative_url }}">Cumulating windows</a></li>
<li><a href="{{ "/split-a-stream-of-events-into-substreams/flinksql.html" | relative_url }}">Splitting event streams</a></li>
<li><a href="{{ "/finding-distinct-events/flinksql.html" | relative_url }}">Deduplication</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-atom.svg" | relative_url }}" />
<div>Build Applications</div>
<!-- Building event-driven applications with best practices like callbacks and exception handling -->
</div>
<ul>
<li><a href="{{ "/creating-first-apache-kafka-producer-application/confluent.html" | relative_url }}">Your first Kafka producer application</a></li>
<li><a href="{{ "/creating-first-apache-kafka-consumer-application/confluent.html" | relative_url }}">Your first Kafka consumer application</a></li>
<li><a href="{{ "/creating-first-apache-kafka-streams-application/confluent.html" | relative_url }}">Your first Kafka Streams application</a></li>
<li><a href="{{ "/kafka-producer-callback-application/confluent.html" | relative_url }}">Callbacks</a></li>
<li><a href="{{ "/error-handling/confluent.html" | relative_url }}">Uncaught Exceptions</a></li>
<li><a href="{{ "/optimize-producer-throughput/confluent.html" | relative_url }}">Optimize producer for throughput</a></li>
<li><a href="{{ "/confluent-parallel-consumer/confluent.html" | relative_url }}">The Confluent Parallel Consumer</a></li>
<li><a href="{{ "/produce-consume-lang/scala.html" | relative_url }}">Non-Java client applications</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-cluster.svg" | relative_url }}" />
<div>Kafka topics</div>
<!-- Working with Apache Kafka topics and related configurations -->
</div>
<ul>
<li><a href="{{ "/how-to-count-messages-on-a-kafka-topic/confluent.html" | relative_url }}">Count the number of messages</a></li>
<li><a href="{{ "/change-topic-partitions-replicas/ksql.html" | relative_url }}">Update partitions and replicas</a></li>
<li><a href="{{ "/message-ordering/kafka.html" | relative_url }}">Maintain message ordering</a></li>
<li><a href="{{ "/multiple-event-type-topics/confluent.html" | relative_url }}">Multiple event types in a single topic</a></li>
</ul>
</div>
</div>
<!-- END cards -->
<div class="cards secondary-card-row">
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-stream.svg" | relative_url }}" />
<div>Route Events</div>
<!-- Deciding where to send events, splitting, merging, and filtering streams -->
</div>
<ul>
<li><a href="{{ "/split-a-stream-of-events-into-substreams/confluent.html" | relative_url }}">Split a stream into substreams</a></li>
<li><a href="{{ "/merge-many-streams-into-one-stream/confluent.html" | relative_url }}">Merge many streams into one</a></li>
<li><a href="{{ "/dynamic-output-topic/confluent.html" | relative_url }}">Choose the output topic dynamically</a></li>
<li><a href="{{ "/filter-a-stream-of-events/confluent.html" | relative_url }}">Filter a stream of events</a></li>
<li><a href="{{ "/finding-distinct-events/confluent.html" | relative_url }}">Find distinct events</a></li>
</ul>
<!--div id="show"><a class="button is-small is-fullwidth">More</a></div-->
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-hub-spoke.svg" | relative_url }}" />
<div>Manipulate Streams</div>
<!-- Working with streams, tables, data formats, and other event-processing operations -->
</div>
<ul>
<li><a href="{{ "/kafka-streams-convert-to-ktable/confluent.html" | relative_url }}">Convert a KStream to a KTable</a></li>
<li><a href="{{ "/rekey-a-stream/ksql.html" | relative_url }}">Rekey a stream with a value</a></li>
<li><a href="{{ "/rekey-with-function/ksql.html" | relative_url }}">Rekey a stream with a function</a></li>
<li><a href="{{ "/naming-stateful-operations/kstreams.html" | relative_url }}">Name stateful operations</a></li>
<li><a href="{{ "/handling-deserialization-errors/ksql.html" | relative_url }}">Handle deserialization errors</a></li>
<li><a href="{{ "/changing-serialization-format/ksql.html" | relative_url }}">Convert serialization format</a></li>
<li><a href="{{ "/kafka-streams-schedule-operations/kstreams.html" | relative_url }}">Scheduling operations</a></li>
<li><a href="{{ "/schedule-ktable-ttl/kstreams.html" | relative_url }}">Expire data in a KTable with TTLs</a></li>
<li><a href="{{ "/schedule-ktable-ttl-aggregate/kstreams.html" | relative_url }}">Expire data in a KTable created from aggregate()</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img class="icon-aggregate" src="{{ "/assets/img/icon-aggregate.svg" | relative_url }}" />
<div>Aggregate data</div>
<!-- Implementing stateful operations on events -->
</div>
<ul>
<li><a href="{{ "/create-stateful-aggregation-count/confluent.html" | relative_url }}">Count a stream of events</a></li>
<li><a href="{{ "/create-stateful-aggregation-sum/confluent.html" | relative_url }}">Sum a stream of events</a></li>
<li><a href="{{ "/create-stateful-aggregation-minmax/ksql.html" | relative_url }}">Find the min/max</a></li>
<li><a href="{{ "/aggregating-average/kstreams.html" | relative_url }}">Calculate a running average</a></li>
<li><a href="{{ "/cogrouping-streams/confluent.html" | relative_url }}">Cogrouping aggregates</a></li>
</ul>
</div>
</div>
<!--END 2nd card row -->
<div class="cards third-card-row">
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-join.svg" | relative_url }}" />
<div>Join data</div>
<!-- Combining data from two or more sources based on common keys -->
</div>
<ul>
<li><a href="{{ "/join-a-stream-to-a-table/confluent.html" | relative_url }}">Join a stream and a table</a></li>
<li><a href="{{ "/join-a-stream-to-a-stream/ksql.html" | relative_url }}">Join a stream and a stream</a></li>
<li><a href="{{ "/join-a-table-to-a-table/ksql.html" | relative_url }}">Join a table and a table</a></li>
<li><a href="{{ "/foreign-key-joins/kstreams.html" | relative_url }}">Join two tables with a foreign key</a></li>
<li><a href="{{ "/multi-joins/ksql.html" | relative_url }}">Multi-join expressions</a></li>
<li><a href="{{ "/versioned-ktables/kstreams.html" | relative_url }}">Using versioned KTables for temporal join accuracy</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-time.svg" | relative_url }}" />
<div>Windowing Operations</div>
<!-- Putting stateful operations results into groups based on time-->
</div>
<ul>
<li><a href="{{ "/create-tumbling-windows/confluent.html" | relative_url }}">Tumbling windows</a></li>
<li><a href="{{ "/create-session-windows/confluent.html" | relative_url }}">Session windows</a></li>
<li><a href="{{ "/create-hopping-windows/ksql.html" | relative_url }}">Hopping windows</a></li>
<li><a href="{{ "/sliding-windows/kstreams.html" | relative_url }}">Sliding windows</a></li>
<li><a href="{{ "/create-cumulating-windows/flinksql.html" | relative_url }}">Cumulating windows</a></li>
<li><a href="{{ "/window-final-result/kstreams.html" | relative_url }}">Emit a final result</a></li>
<li><a href="{{ "/anomaly-detection/ksql.html" | relative_url }}">Anomaly detection</a></li>
<li><a href="{{ "/time-concepts/ksql.html" | relative_url }}">Event-time semantics</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-connect.svg" | relative_url }}" />
<div>Connect data sources & sinks</div>
<!-- Using connectors to read data to Kafka topics and to write data out -->
</div>
<ul>
<li><a href="{{ "/kafka-connect-datagen/confluent.html" | relative_url }}">Generate simple mock Kafka data</a></li>
<li><a href="{{ "/generate-streams-of-test-data/ksql.html" | relative_url }}">Generate complex mock Kafka data</a></li>
<li><a href="{{ "/connect-add-key-to-source/kstreams.html" | relative_url }}">Add a key to a stream from a JDBC source</a></li>
<li><a href="{{ "/connect-sink-timestamp/ksql.html" | relative_url }}">Convert timezone before sending to a database</a></li>
<li><a href="{{ "/custom-connector/confluent.html" | relative_url }}">Build and deploy a custom connector on Confluent Cloud</a></li>
</ul>
</div>
</div>
<!-- END Third card row-->
<div class="cards fourth-card-row">
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-kafka-blue.svg" | relative_url }}" />
<div>CLI</div>
<!-- Using Apache Kafka and Confluent CLIs to produce and consume events -->
</div>
<ul>
<li><a href="{{ "/kafka-console-consumer-producer-basics/confluent.html" | relative_url }}">Basic Produce and Consume</a></li>
<li><a href="{{ "/kafka-console-consumer-producer-avro/confluent.html" | relative_url }}">CLI with (de)serializers</a></li>
<li><a href="{{ "/kafka-console-consumer-primitive-keys-values/kafka.html" | relative_url }}">Primitive keys and values</a></li>
<li><a href="{{ "/kafka-console-consumer-read-specific-offsets-partitions/confluent.html" | relative_url }}">Read from an offset and partition</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-function.svg" | relative_url }}" />
<div>Access Fields</div>
<!-- Reading fields within a record, and working with JSON -->
</div>
<ul>
<li><a href="{{ "/transform-a-stream-of-events/confluent.html" | relative_url }}">Transform a stream of events</a></li>
<li><a href="{{ "/working-with-json-different-structure/ksql.html" | relative_url }}">Heterogenous JSON</a></li>
<li><a href="{{ "/working-with-nested-json/ksql.html" | relative_url }}">Nested JSON</a></li>
<li><a href="{{ "/flatten-nested-data/ksql.html" | relative_url }}">Flatten deeply nested events</a></li>
</ul>
</div>
<div class="card">
<div class="title">
<img src="{{ "/assets/img/icon-cascade.svg" | relative_url }}" />
<div>Manipulate Values</div>
<!-- Implementing stateless operations on events -->
</div>
<ul>
<li><a href="{{ "/udf/ksql.html" | relative_url }}">User-defined functions (UDF)</a></li>
<li><a href="{{ "/concatenation/ksql.html" | relative_url }}">Concatenation</a></li>
<li><a href="{{ "/masking-data/ksql.html" | relative_url }}">Mask data</a></li>
<li><a href="{{ "/column-difference/ksql.html" | relative_url }}">Calculate column difference</a></li>
<li><a href="{{ "/geo-distance/ksql.html" | relative_url }}">Calculate lat-long distance</a></li>
</ul>
</div>
</div>
<!-- END fourth card row -->
<div class="cards fifth-card-row">
<div class="card card-cta">
<div class="title">
<div>Be the first to be notified about new tutorials</div>
<form id="mktoForm_3977" style="display:none"></form>
<div id="mkto-form">
<div class="form">
<div class="is-hidden">Thank you!</div>
<a class="cta-button secondary">Sign Up</a>
<form>
<input type="email" placeholder="Enter Email" name="Email" />
<button class="cta-button secondary" type="submit">Submit</button>
</form>
</div>
</div>
</div>
<div id="signup-notice" class="is-hidden notice">
<p>
By subscribing you understand we will process your personal information in accordance with our <a href="https://www.confluent.io/privacy">Privacy Statement</a>.
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</div>
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</div>
<!-- END fifth-card row-->
</div>
{% include footer.html %}
<script src="{{ "/assets/js/segment.js" | relative_url }}"></script>
<script src="{{ "/assets/js/jquery.min.js" | relative_url }}"></script>
<script src="{{ "/assets/js/main.js" | relative_url }}"></script>
<script src="{{ "/assets/js/nav.js" | relative_url }}"></script>
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