Get broker metrics timeout

Hi all， we have a cluster with 10 brokers, and our kafka version is 0.9.0.1，we repeatedly get our metric data such as offlinePartition metric from each broker with 2 minutes gap to achieve the goal of cluster’s monitor. but accidental timeout occurs when we get data from some of brokers.

Can broker recover to alive when zk callback miss？

hi, we meet a issue that the temporary node of broker in zookeeper was lost when the network bewteen broker and zk cluster is not good enough, while the process of the broker still exist. as we know, the controller would consider it to be offline in kafka. After we open zkClient log, we