-RE: a few questions from high level consumer documentation.
Rob Withers 2013-05-09, 04:37
> -----Original Message-----
> From: Chris Curtin [mailto:[EMAIL PROTECTED]]
> > 1 When you say the iterator may block, do you mean hasNext() may block?
Is this due to a potential non-blocking fetch (broker/zookeeper returns an
empty block if offset is current)? Yet this blocks the network call of the
consumer iterator, do I have that right? Are there other reasons it could
block? Like the call fails and a backup call is made?
> > b. For client crash, what can client do to avoid duplicate messages
> > when restarted? What I can think of is to read last message from log
> > file and ignore the first few received duplicate messages until
> > receiving the last read message. But is it possible for client to read
> If you can't tolerate the possibility of duplicates you need to look at
> Simple Consumer example, There you control the offset storage.
Do you have example code that manages only once, even when a consumer for a
given partition goes away?
What does happen with rebalancing when a consumer goes away? Is this
behavior of the high-level consumer group? Is there a way to supply one's
own simple consumer with only once, within a consumer group that rebalances?
What happens if a producer goes away?