@Override
        public String toString() {
            return "SharePartitionKey{" +
                "groupId='" + groupId +
                ", topicIdPartition=" + topicIdPartition +
                '}';
        }
The SharePartitionKey is used to uniquely identify a share partition. The key is made up of the
share group id, the topic id and the partition id. The key is used to store the SharePartition
objects in the partition cache map.
core/src/main/java/kafka/server/share/SharePartitionManager.java