>> For each consumer consumes different topic/replica I have to specify those 20 brokers and go over all of them to know which broker is alive. And even worse how about I dynamically add new broker into the cluster and remove the old one
TopicMetadataRequest is a batch API and you can get metadata information for either a list of all topics or all topics in the cluster, if you specify an empty list of topics. Adding a broker is not a problem since the metadata request also returns the list of brokers in a cluster. The reason this is better than reading from zookeeper is because the same operation would require multiple zookeeper roundtrips, instead of a single TopicMetadataRequest roundtrip to some kafka broker. Thanks, Neha On Fri, Oct 11, 2013 at 11:30 AM, hsy...@gmail.com <hsy...@gmail.com> wrote: > Thanks guys! > But I feel weird. Assume I have 20 brokers for 10 different topics with 2 > partitions and 2 replicas for each. For each consumer consumes different > topic/replica I have to specify those 20 brokers and go over all of them to > know which broker is alive. And even worse how about I dynamically add new > broker into the cluster and remove the old one. I think it's nice to have a > way to get metadata from zookeeper(centralized coordinator?) directly. > > Best, > Siyuan > > > On Fri, Oct 11, 2013 at 9:12 AM, Neha Narkhede <neha.narkh...@gmail.com > >wrote: > > > If, for some reason, you don't have access to a virtual IP or load > > balancer, you need to round robin once through all the brokers before > > failing a TopicMetadataRequest. So unless all the brokers in your cluster > > are down, this should not be a problem. > > > > Thanks, > > Neha > > > > > > On Thu, Oct 10, 2013 at 10:50 PM, hsy...@gmail.com <hsy...@gmail.com> > > wrote: > > > > > Hi guys, > > > > > > I'm trying to maintain a bunch of simple kafka consumer to consume > > messages > > > from brokers. I know there is a way to send TopicMetadataRequest to > > broker > > > and get the response from the broker. But you have to specify the > broker > > > list to query the information. But broker might not be available > because > > of > > > some failure. My question is is there any api I can call and query > broker > > > metadata for topic/partition directly from zookeeper? I know I can > query > > > that information using zookeeper API. But that's not friendly > > datastructure > > > like the TopicMetadata/PartitionMetadata. Thank you! > > > > > > Best, > > > Siyuan > > > > > >
