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https://issues.apache.org/jira/browse/KAFKA-2392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15516397#comment-15516397
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Stig Rohde Døssing commented on KAFKA-2392:
-------------------------------------------
I don't know if this helps you, but this can already be done if you're willing
to run Kafka in-memory. We're using Curator's TestingServer to run an in-memory
Zookeeper, which allows you to get the assigned port
https://curator.apache.org/apidocs/org/apache/curator/test/TestingServer.html#getConnectString--.
You can then use that string to start an in-memory Kafka broker.
{code}
TestingServer testingServer = new TestingServer()
Properties properties = new Properties();
properties.setProperty("zookeeper.connect", testingServer.getConnectString());
properties.setProperty("advertised.host.name", "localhost");
properties.setProperty("host.name", "localhost");
properties.setProperty("port", "0");
KafkaServer server = new KafkaServer(new KafkaConfig(properties), new
SystemTime(), scala.Option$.MODULE$.apply(null));
server.startup();
{code}
Where SystemTime is this
{code}
public class SystemTime implements Time {
public long milliseconds() {
return System.currentTimeMillis();
}
public long nanoseconds() {
return System.nanoTime();
}
public void sleep(long ms) {
try {
Thread.sleep(ms);
} catch (InterruptedException e) {
// Ignore
}
}
}
{code}
We're on Kafka 0.9.0.1, the parameters may be slightly different on 0.8.
> Kafka Server does not accept 0 as a port
> ----------------------------------------
>
> Key: KAFKA-2392
> URL: https://issues.apache.org/jira/browse/KAFKA-2392
> Project: Kafka
> Issue Type: Bug
> Components: config
> Affects Versions: 0.8.2.1
> Reporter: Buğra Gedik
> Priority: Minor
>
> I want to specify 0 as a port number for Zookeeper as well as Kafka Server.
> For instance server.properties configuration file has a 'port' property, but
> does not accept 0 as a value. Similarly, zookeeper.properties has a
> 'clientPort' property, but does not accept 0 as a value.
> I want 0 to specify that the port will be selected automatically (OS
> assigned). In my use case, I want to run Zookeeper with an automatically
> picked port, and use that port to create a Kafka Server configuration file,
> that specifies the Kafka Server port as 0 as well. I parse the output from
> the servers to figure out the actual ports used. All this is needed for a
> testing environment.
> Not supporting automatically selected ports makes it difficult to run Kafka
> server as part of our tests.
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