Yogesh, Delete topic is not supported in 0.8 beta yet. We decided to take this feature out in 0.8 beta to make the release available sooner.
Thanks, Jun On Tue, Jun 18, 2013 at 6:25 AM, Yogesh Sangvikar < yogesh.sangvi...@gmail.com> wrote: > Hi Team, > > I am exploring kafka 0.8 beta release to understand data flow, replication > features. > While testing i found that, the partition data for data for deleted topic > is preseved in kafka-logs, why this behavior? suppose below case, > > A topic (suppose test1) is created with partition 6 and replication 3 on a > system with 4 brokers, respective log and index files will be prepared per > partition in kafka-logs. If I delete the topic and recreate the same topic > ‘test1’ after some time with partition 2 and replication 2. The kafka-logs > directory seems to be confusing to understand why the partitions for > previous topic are present. *Please help to understand this scenario*. > > Also, while testing the replication and leader selection feature observed > leader -1 status, > > Original status: > topic: test1 partition: 0 leader: 4 replicas: 4,2,3 isr: 4,2,3 > topic: test1 partition: 1 leader: 0 replicas: 0,3,4 isr: 0,3,4 > topic: test1 partition: 2 leader: 1 replicas: 1,4,0 isr: 1,4,0 > if leader 4 goes down: > topic: test1 partition: 0 leader: 2 replicas: 4,2,3 isr: 2,3 > topic: test1 partition: 1 leader: 0 replicas: 0,3,4 isr: 0,3,4 > topic: test1 partition: 2 leader: 1 replicas: 1,4,0 isr: 1,0,4 > > if leader 2 goes down: > topic: test1 partition: 0 leader: 3 replicas: 4,2,3 isr: 3 > topic: test1 partition: 1 leader: 0 replicas: 0,3,4 isr: 0,3,4 > topic: test1 partition: 2 leader: 1 replicas: 1,4,0 isr: 1,0,4 > > if again leader 3 goes down: > topic: test1 partition: 0 leader: -1 replicas: 4,2,3 isr: > topic: test1 partition: 1 leader: 0 replicas: 0,3,4 isr: 0,4 > topic: test1 partition: 2 leader: 1 replicas: 1,4,0 isr: 1,0,4 > > As per kafka protocol guide, *leader: -1 means If no leader exists because > we are in the middle of a leader election this id will be -1.* > > *Does it mean that, the data from partition 0 will be unavailable due no > leader (leader selection in progress)?* > As per my understanding, can we have auto re-balancer facility to > re-balance the partition replications to available brokers if one of the > broker is down, as in above case of (if leader 4 goes down), we can > replicate the partition 0 to broker 0/1 to re-balance the replication. > > Please correct me for any wrong understanding as those are my initial > observations. > > Thanks in advance. > > Thanks, > Yogesh Sangvikar >
