protected boolean readPartition(TopicPartition topicPartition) {
        return true;
    }
Signals whether a topic partition should be read by this log. Invoked on {@link #start() startup} once
for every partition found in the log's backing topic.
<p>This method can be overridden by subclasses when only a subset of the assigned partitions
should be read into memory. By default, all partitions are read.
@param topicPartition A topic partition which could be read by this log.
@return true if the partition should be read by this log, false if its contents should be ignored.
connect/runtime/src/main/java/org/apache/kafka/connect/util/KafkaBasedLog.java