PartitionRegistration getPartition(Uuid topicId, int partitionId) {
        TopicControlInfo topic = topics.get(topicId);
        if (topic == null) {
            return null;
        }
        return topic.parts.get(partitionId);
    }
Timer for partition reassignment elect timeout.
metadata/src/main/java/org/apache/kafka/controller/ReplicationControlManager.java