Consumer loses messages of a new topic with auto.offset.reset = largest

Consumer currently uses auto.offset.reset = largest by default. If a new topic is created, consumer's topic watcher is fired. The consumer will first finish partition reassignment as part of rebalance and then start consuming from the tail of each partition. Until the partition reassignment is over, the server may have appended new messages to the new topic, consumer won't consume these messages. Thus, multiple batches of messages may be lost when a topic is newly created.

The fix is to start consuming from the earliest offset for newly created topics.