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<title>Confluent Platform Helm Charts</title>
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<body class="article">
<div id="header">
<h1>Confluent Platform Helm Charts</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>You can use the Helm charts to deploy services on Kubernetes for development, test, and proof of concept environments.</p>
</div>
<div class="admonitionblock caution">
<table>
<tr>
<td class="icon">
<i class="fa icon-caution" title="Caution"></i>
</td>
<td class="content">
Open Source Helm charts are not supported by Confluent.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p><strong>If you want to use Confluent Platform on Kubernetes in a test or production environment, follow these instructions to install <a href="https://docs.confluent.io/current/installation/operator/index.html#operator-about-intro">Confluent Operator</a>.</strong></p>
</div>
<div id="toc" class="toc">
<div id="toctitle" class="title">Table of content</div>
<ul class="sectlevel1">
<li><a href="#installation">Installation</a></li>
<li><a href="#contributing">Contributing</a></li>
<li><a href="#documentation">Documentation</a>
<ul class="sectlevel2">
<li><a href="#environment-preparation">Environment Preparation</a>
<ul class="sectlevel3">
<li><a href="#tested-software">Tested Software</a></li>
<li><a href="#install-helm-on-kubernetes">Install Helm on Kubernetes</a></li>
</ul>
</li>
<li><a href="#persistence">Persistence</a></li>
<li><a href="#install-confluent-platform-charts">Install Confluent Platform Charts</a></li>
<li><a href="#verify-installation">Verify Installation</a>
<ul class="sectlevel3">
<li><a href="#using-helm">Using Helm</a></li>
<li><a href="#verify-kafka-cluster">Verify Kafka cluster</a></li>
<li><a href="#manual-test">Manual Test</a></li>
<li><a href="#run-a-streams-application">Run A Streams Application</a></li>
</ul>
</li>
<li><a href="#operations">Operations</a>
<ul class="sectlevel3">
<li><a href="#scaling-zookeeper">Scaling Zookeeper</a></li>
<li><a href="#scaling-kafka">Scaling Kafka</a></li>
<li><a href="#monitoring">Monitoring</a></li>
</ul>
</li>
<li><a href="#teardown">Teardown</a></li>
</ul>
</li>
<li><a href="#appendix-create-a-local-kubernetes-cluster">Appendix: Create a Local Kubernetes Cluster</a>
<ul class="sectlevel2">
<li><a href="#create-local-minikube">Install Minikube and Drivers</a></li>
<li><a href="#start-minikube">Start Minikube</a>
<ul class="sectlevel3">
<li><a href="#verify-minikube-local-kubernetes-environment">Verify Minikube Local Kubernetes Environment</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#thanks">Thanks</a></li>
</ul>
</div>
<div class="paragraph">
<p>The <a href="https://github.com/confluentinc/cp-helm-charts">Confluent Platform Helm Charts</a> enable you to deploy Confluent Platform components on Kubernetes for development, test, and proof of concept environments.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="installation"><a class="anchor" href="#installation"></a>Installation</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="title">Installing helm chart</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="bash">helm repo add confluentinc https://confluentinc.github.io/cp-helm-charts/ <i class="conum" data-value="1"></i><b>(1)</b>
helm repo update <i class="conum" data-value="2"></i><b>(2)</b>
helm <span class="nb">install </span>confluentinc/cp-helm-charts <span class="nt">--name</span> my-confluent <span class="nt">--version</span> 0.5.0 <i class="conum" data-value="3"></i><b>(3)</b></code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>Add <code>confluentinc</code> helm charts repo</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>Update repo information</td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>Install Confluent Platform with release name «my-confluent» and version <code>0.5.0</code></td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="contributing"><a class="anchor" href="#contributing"></a>Contributing</h2>
<div class="sectionbody">
<div class="paragraph">
<p>We welcome any contributions:</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
It’s not officially supported repo, hence support is on "best effort" basis.
</td>
</tr>
</table>
</div>
<div class="ulist">
<ul>
<li>
<p>Report all enhancements, bugs, and tasks as <a href="https://github.com/confluentinc/cp-helm-charts/issues">GitHub issues</a></p>
</li>
<li>
<p>Provide fixes or enhancements by opening pull requests in GitHub</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="documentation"><a class="anchor" href="#documentation"></a>Documentation</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="https://helm.sh/">Helm</a> is an open-source packaging tool that helps you install applications and services on Kubernetes.
Helm uses a packaging format called charts.
Charts are a collection of YAML templates that describe a related set of Kubernetes resources.</p>
</div>
<div class="paragraph">
<p>This repository provides Helm charts for the following Confluent
Platform services:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>ZooKeeper</p>
</li>
<li>
<p>Kafka brokers</p>
</li>
<li>
<p>Kafka Connect</p>
</li>
<li>
<p>Confluent Schema Registry</p>
</li>
<li>
<p>Confluent REST Proxy</p>
</li>
<li>
<p>ksqlDB</p>
</li>
<li>
<p>Confluent Control Center</p>
</li>
</ul>
</div>
<div class="sect2">
<h3 id="environment-preparation"><a class="anchor" href="#environment-preparation"></a>Environment Preparation</h3>
<div class="paragraph">
<p>You must have a Kubernetes cluster that has Helm configured.</p>
</div>
<div class="sect3">
<h4 id="tested-software"><a class="anchor" href="#tested-software"></a>Tested Software</h4>
<div class="paragraph">
<p>These Helm charts have been tested with the following software versions:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://kubernetes.io/">Kubernetes</a> 1.9.2+</p>
</li>
<li>
<p><a href="https://helm.sh/">Helm</a> 2.8.2+</p>
</li>
<li>
<p><a href="https://hub.docker.com/u/confluentinc/">Confluent Platform Docker Images</a></p>
</li>
</ul>
</div>
<div class="paragraph">
<p>For local Kubernetes installation with Minikube, see <a href="#create-local-minikube">Install Minikube and Drivers</a>.</p>
</div>
</div>
<div class="sect3">
<h4 id="install-helm-on-kubernetes"><a class="anchor" href="#install-helm-on-kubernetes"></a>Install Helm on Kubernetes</h4>
<div class="paragraph">
<p>Follow the directions to <a href="https://docs.helm.sh/using_helm/#quickstart-guide">install and deploy Helm</a> to the Kubernetes cluster.</p>
</div>
<div class="paragraph">
<p>View a list of all deployed releases in the local installation.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">helm init
helm repo update
helm list</code></pre>
</div>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
For Helm versions prior to 2.9.1, you may see <code>"connect: connection refused"</code>, and will need to fix up the deployment before proceeding.
</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">kubectl delete <span class="nt">--namespace</span> kube-system svc tiller-deploy
kubectl delete <span class="nt">--namespace</span> kube-system deploy tiller-deploy
kubectl create serviceaccount <span class="nt">--namespace</span> kube-system tiller
kubectl create clusterrolebinding tiller-cluster-rule <span class="nt">--clusterrole</span><span class="o">=</span>cluster-admin <span class="nt">--serviceaccount</span><span class="o">=</span>kube-system:tiller
kubectl patch deploy <span class="nt">--namespace</span> kube-system tiller-deploy <span class="nt">-p</span> <span class="s1">'{"spec":{"template":{"spec":{"serviceAccount":"tiller"}}}}'</span>
helm init <span class="nt">--service-account</span> tiller <span class="nt">--upgrade</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect2">
<h3 id="persistence"><a class="anchor" href="#persistence"></a>Persistence</h3>
<div class="paragraph">
<p>The ZooKeeper and Kafka cluster deployed with <code>StatefulSets</code> that have a <code>volumeClaimTemplate</code> which provides the persistent volume for each replica.
You can define the size of the volumes by changing <code>dataDirSize</code> and <code>dataLogDirSize</code> under <code>cp-zookeeper</code> and <code>size</code> under <code>cp-kafka</code> in <a href="https://github.com/confluentinc/cp-helm-charts/blob/master/values.yaml">values.yaml</a>.</p>
</div>
<div class="paragraph">
<p>You also could use the cloud provider’s volumes by specifying <a href="https://kubernetes.io/docs/concepts/storage/storage-classes/">StorageClass</a>.
For example, if you are on AWS your storage class will look like this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="yaml"><span class="na">apiVersion</span><span class="pi">:</span> <span class="s">storage.k8s.io/v1beta1</span>
<span class="na">kind</span><span class="pi">:</span> <span class="s">StorageClass</span>
<span class="na">metadata</span><span class="pi">:</span>
<span class="na">name</span><span class="pi">:</span> <span class="s">ssd</span>
<span class="na">provisioner</span><span class="pi">:</span> <span class="s">kubernetes.io/aws-ebs</span>
<span class="na">parameters</span><span class="pi">:</span>
<span class="na">type</span><span class="pi">:</span> <span class="s">gp2</span></code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
To adapt this example to your needs, read the Kubernetes <a href="https://kubernetes.io/docs/concepts/storage/storage-classes/#parameters">StorageClass</a> documentation.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The <code>StorageClass</code> that was created can be specified in <code>dataLogDirStorageClass</code> and <code>dataDirStorageClass</code> under <code>cp-zookeeper</code> and in <code>storageClass+</code> under <code>cp-kafka</code> in <a href="https://github.com/confluentinc/cp-helm-charts/blob/master/values.yaml">values.yaml</a>.</p>
</div>
<div class="paragraph">
<p>To deploy non-persistent Kafka and ZooKeeper clusters, you must change the value of <code>persistence.enabled</code> under <code>cp-kafka</code> and <code>cp-zookeeper</code> in <a href="https://github.com/confluentinc/cp-helm-charts/blob/master/values.yaml">values.yaml</a></p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
These type of clusters are suitable for <strong>strictly</strong> development and testing purposes.
The <code>StatefulSets+</code> are going to use <code>emptyDir</code> volumes, this means that its content strictly related to the pod life cycle and is deleted when the pod goes down.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="install-confluent-platform-charts"><a class="anchor" href="#install-confluent-platform-charts"></a>Install Confluent Platform Charts</h3>
<div class="paragraph">
<p>Clone the Confluent Helm Chart repo</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh"><span class="o">></span> helm repo add confluentinc https://confluentinc.github.io/cp-helm-charts/
<span class="s2">"confluentinc"</span> has been added to your repositories
<span class="o">></span> helm repo update
Hang tight <span class="k">while </span>we grab the latest from your chart repositories...
...Skip <span class="nb">local </span>chart repository
...Successfully got an update from the <span class="s2">"confluentinc"</span> chart repository
...Successfully got an update from the <span class="s2">"stable"</span> chart repository
Update Complete. ⎈ Happy Helming!⎈</code></pre>
</div>
</div>
<div class="paragraph">
<p>Install a 3 node Zookeeper ensemble, a Kafka cluster of 3 brokers, 1 Confluent Schema Registry instance, 1 REST Proxy instance, and 1 Kafka Connect worker, 1 ksqlDB server in your Kubernetes environment.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Naming the chart <code>--name my-confluent-oss</code> is optional, but we assume this is the name in the remainder of the documentation.
Otherwise, helm will generate release name.
</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">helm <span class="nb">install </span>confluentinc/cp-helm-charts <span class="nt">--name</span> my-confluent-oss</code></pre>
</div>
</div>
<div class="paragraph">
<p>If you want to install without the Confluent Schema Registry instance, the REST Proxy instance, and the Kafka Connect worker:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">helm <span class="nb">install</span> <span class="nt">--set</span> cp-schema-registry.enabled<span class="o">=</span><span class="nb">false</span>,cp-kafka-rest.enabled<span class="o">=</span><span class="nb">false</span>,cp-kafka-connect.enabled<span class="o">=</span><span class="nb">false </span>confluentinc/cp-helm-charts</code></pre>
</div>
</div>
<div class="paragraph">
<p>View the installed Helm releases:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">helm list
NAME REVISION UPDATED STATUS CHART NAMESPACE
my-confluent-oss 1 Tue Jun 12 16:56:39 2018 DEPLOYED cp-helm-charts-0.1.0 default</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="verify-installation"><a class="anchor" href="#verify-installation"></a>Verify Installation</h3>
<div class="sect3">
<h4 id="using-helm"><a class="anchor" href="#using-helm"></a>Using Helm</h4>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
<em>This step is optional</em>
</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="title">Run the embedded test pod in each sub-chart to verify installation</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">helm <span class="nb">test </span>my-confluent-oss</code></pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="verify-kafka-cluster"><a class="anchor" href="#verify-kafka-cluster"></a>Verify Kafka cluster</h4>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
<em>This step is optional</em> - to verify that Kafka is working as expected, connect to one of the Kafka pods and produce some messages to a Kafka topic.
</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="title">List your pods and wait until they are all in <code>Running</code> state.</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">kubectl get pods</code></pre>
</div>
</div>
<div class="paragraph">
<div class="title">Connect to the container <code>cp-kafka-broker</code> in a Kafka broker pod to produce messages to a Kafka topic.</div>
<p>If you specified a different release name, substitute <code>my-confluent-oss</code> with whatever you named your release.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sh">kubectl <span class="nb">exec</span> <span class="nt">-c</span> cp-kafka-broker <span class="nt">-it</span> my-confluent-oss-cp-kafka-0 <span class="nt">--</span> /bin/bash /usr/bin/kafka-console-producer <span class="nt">--broker-list</span> localhost:9092 <span class="nt">--topic</span> <span class="nb">test</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Wait for a <code>></code> prompt, and enter some text.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>m1
m2</pre>
</div>
</div>
<div class="paragraph">
<p>Press <span class="keyseq"><kbd>Ctrl</kbd>+<kbd>C</kbd></span> to close the producer session.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Consume the messages from the same Kafka topic as above.</p>
</li>
</ol>
</div>
<div class="listingblock">
<div class="content">
<pre>kubectl exec -c cp-kafka-broker -it my-confluent-oss-cp-kafka-0 -- /bin/bash /usr/bin/kafka-console-consumer --bootstrap-server localhost:9092 --topic test --from-beginning</pre>
</div>
</div>
<div class="paragraph">
<p>You should see the messages which were published from the console producer.
Press <span class="keyseq"><kbd>Ctrl</kbd>+<kbd>C</kbd></span> to stop consuming.</p>
</div>
</div>
<div class="sect3">
<h4 id="manual-test"><a class="anchor" href="#manual-test"></a>Manual Test</h4>
<div class="sect4">
<h5 id="zookeepers"><a class="anchor" href="#zookeepers"></a>Zookeepers</h5>
<div class="listingblock">
<div class="content">
<pre>git clone https://github.com/confluentinc/cp-helm-charts.git <i class="conum" data-value="1"></i><b>(1)</b>
kubectl apply -f cp-helm-charts/examples/zookeeper-client.yaml <i class="conum" data-value="2"></i><b>(2)</b>
...
kubectl exec -it zookeeper-client -- /bin/bash zookeeper-shell <zookeeper service>:<port> ls /brokers/ids <i class="conum" data-value="3"></i><b>(3)</b>
kubectl exec -it zookeeper-client -- /bin/bash zookeeper-shell <zookeeper service>:<port> get /brokers/ids/0
kubectl exec -it zookeeper-client -- /bin/bash zookeeper-shell <zookeeper service>:<port> ls /brokers/topics <i class="conum" data-value="4"></i><b>(4)</b></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>Clone Helm Chars git repository</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>Deploy a client pod.</td>
</tr>
<tr>
<td><i class="conum" data-value="3"></i><b>3</b></td>
<td>Connect to the client pod and use the <code>zookeeper-shell</code> command to explore brokers…​</td>
</tr>
<tr>
<td><i class="conum" data-value="4"></i><b>4</b></td>
<td>topics, etc.</td>
</tr>
</table>
</div>
</div>
<div class="sect4">
<h5 id="kafka"><a class="anchor" href="#kafka"></a>Kafka</h5>
<div class="listingblock">
<div class="title">Validate Kafka installation</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="bash">kubectl apply <span class="nt">-f</span> cp-helm-charts/examples/kafka-client.yaml <i class="conum" data-value="1"></i><b>(1)</b>
kubectl <span class="nb">exec</span> <span class="nt">-it</span> kafka-client <span class="nt">--</span> /bin/bash <i class="conum" data-value="2"></i><b>(2)</b></code></pre>
</div>
</div>
<div class="colist arabic">
<table>
<tr>
<td><i class="conum" data-value="1"></i><b>1</b></td>
<td>Deploy a Kafka client pod.</td>
</tr>
<tr>
<td><i class="conum" data-value="2"></i><b>2</b></td>
<td>Log into the Pod</td>
</tr>
</table>
</div>
<div class="listingblock">
<div class="title">From within the kafka-client pod, explore with kafka commands:</div>
<div class="content">
<pre class="rouge highlight"><code data-lang="bash"><span class="c">## Setup</span>
<span class="nb">export </span><span class="nv">RELEASE_NAME</span><span class="o">=</span><release name>
<span class="nb">export </span><span class="nv">ZOOKEEPERS</span><span class="o">=</span><span class="k">${</span><span class="nv">RELEASE_NAME</span><span class="k">}</span><span class="nt">-cp-zookeeper</span>:2181
<span class="nb">export </span><span class="nv">KAFKAS</span><span class="o">=</span><span class="k">${</span><span class="nv">RELEASE_NAME</span><span class="k">}</span><span class="nt">-cp-kafka-headless</span>:9092
<span class="c">## Create Topic</span>
kafka-topics <span class="nt">--zookeeper</span> <span class="nv">$ZOOKEEPERS</span> <span class="nt">--create</span> <span class="nt">--topic</span> test-rep-one <span class="nt">--partitions</span> 6 <span class="nt">--replication-factor</span> 1
<span class="c">## Producer</span>
kafka-run-class org.apache.kafka.tools.ProducerPerformance <span class="nt">--print-metrics</span> <span class="nt">--topic</span> test-rep-one <span class="nt">--num-records</span> 6000000 <span class="nt">--throughput</span> 100000 <span class="nt">--record-size</span> 100 <span class="nt">--producer-props</span> bootstrap.servers<span class="o">=</span><span class="nv">$KAFKAS</span> buffer.memory<span class="o">=</span>67108864 batch.size<span class="o">=</span>8196
<span class="c">## Consumer</span>
kafka-consumer-perf-test <span class="nt">--broker-list</span> <span class="nv">$KAFKAS</span> <span class="nt">--messages</span> 6000000 <span class="nt">--threads</span> 1 <span class="nt">--topic</span> test-rep-one <span class="nt">--print-metrics</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect3">
<h4 id="run-a-streams-application"><a class="anchor" href="#run-a-streams-application"></a>Run A Streams Application</h4>
<div class="paragraph">
<p>ksqlDB is the streaming SQL engine that enables real-time data processing against Apache Kafka.
Now that you have running in your Kubernetes cluster, you may run a <a href="https://github.com/confluentinc/cp-helm-charts/blob/master/examples/ksql-demo.yaml">ksqlDB example</a>.</p>
</div>
</div>
</div>
<div class="sect2">
<h3 id="operations"><a class="anchor" href="#operations"></a>Operations</h3>
<div class="sect3">
<h4 id="scaling-zookeeper"><a class="anchor" href="#scaling-zookeeper"></a>Scaling Zookeeper</h4>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
All scaling operations should be done offline with no producer or consumer connection.
The number of nodes should always be odd number.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Install cp-helm-charts with default 3 node ensemble</p>
</div>
<div class="listingblock">
<div class="content">
<pre>helm install cp-helm-charts</pre>
</div>
</div>
<div class="paragraph">
<p>Scale nodes up to 5, change <code>servers</code> under <code>cp-zookeeper</code> to 5 in <code>values.yaml</code></p>
</div>
<div class="listingblock">
<div class="content">
<pre>helm upgrade <release name> cp-helm-charts</pre>
</div>
</div>
<div class="paragraph">
<p>Scale nodes down to 3, change <code>servers</code> under <code>cp-zookeeper</code> to 3 in <code>values.yaml</code></p>
</div>
<div class="listingblock">
<div class="content">
<pre>helm upgrade <release name> cp-helm-charts</pre>
</div>
</div>
</div>
<div class="sect3">
<h4 id="scaling-kafka"><a class="anchor" href="#scaling-kafka"></a>Scaling Kafka</h4>
<div class="admonitionblock important">
<table>
<tr>