Querying all consumer group (Java APIs) that subscribe to a topic

Problems encountered on the Internet, think of the use of existing APIs can still be achieved.

First, you need to introduce Kafka server-side code, such as adding Kafka 1.0.0 dependencies:

Maven

<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.12</artifactId>
<version>1.0.0</version>
</dependency>

Gradle

Compile group: ' Org.apache.kafka ', Name: ' kafka_2.12 ', version: ' 1.0.0 '

Then write a method that gets all the group subscriptions to a topic, with the following code:

/** * Get all subscribing consumer group names for a given topic * @param brokerlisturl localhost:9092 for Instanc E * @param topic topic name * @return */public static set<string> Getallgroupsfortopic (Strin        G Brokerlisturl, String topic) {adminclient client = Adminclient.createsimpleplaintext (Brokerlisturl); try {list<groupoverview> allgroups = scala.collection.JavaConversions.seqAsJavaList (client.listallgroups            Flattened (). TOSEQ ());            set<string> groups = new hashset<> ();                for (Groupoverview overview:allgroups) {String GroupID = Overview.groupid (); Map<topicpartition, object> offsets = Scala.collection.JavaConversions.mapAsJavaMap (Client.listgroupoffsets (                GroupID));                set<topicpartition> partitions = Offsets.keyset ();             for (Topicpartition tp:partitions) {if (Tp.topic (). Equals (topic)) {           Groups.add (GroupID);        }}} return groups;        } finally {client.close ();　　 }    }

Querying all consumer group (Java APIs) that subscribe to a topic