Question about recovering from outage

Hi all, and thanks for a fantastic product.

The other day our kafka node in our test environment went down due to full
disc. I reconfigured kafka to save fewer messages, and restarted the node.
It is a single node setup. At restart the node freed up some disc space,
but no new messages where accepted. In the log we saw this:

WARN [KafkaApi-0] Produce request with correlation id 12680557 from client
on partition [logs,0] failed due to Partition [logs,0] doesn't exist on 0
(kafka.server.KafkaApis)

List-topics showed:

topic: logs partition: 0 leader: 0 replicas: 0 isr: 0

which seemed fine, but I figured I might have to reassign the topic
partition anyway, so I did. Nothing seemed to happen, neither in the logs
or in the status. Then I got another thing to take care of for awhile, and
realized about 30 minutes later that the node started working again!

Is this expected behavior? How long does a node take to "get online" again
after a crash-restart? Is there a way to tell that the node is on it's way
up?

Thanks / Jonas