Swapnil Ghike created KAFKA-646:
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             Summary: Provide aggregate stats at the high level Producer and 
ZookeeperConsumerConnector level
                 Key: KAFKA-646
                 URL: https://issues.apache.org/jira/browse/KAFKA-646
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.8
            Reporter: Swapnil Ghike
            Priority: Blocker
             Fix For: 0.8


WIth KAFKA-622, we measure ProducerRequestStats and 
FetchRequestAndResponseStats at the SyncProducer and SimpleConsumer level 
respectively. We could also aggregate them in the high level Producer and 
ZookeeperConsumerConnector level to provide an overall sense of 
request/response rate/size at the client level. Currently, I am not completely 
clear about the math that might be necessary for such  aggregation or if 
metrics already provides an API for aggregating stats of the same type.

We should also address the comments by Jun at KAFKA-622, I am copy pasting them 
here:

60. What happens if have 2 instances of Consumers with the same clientid in the 
same jvm? Does one of them fail because it fails to register metrics? Ditto for 
Producers.
61. ConsumerTopicStats: What if a topic is named AllTopics? We use to handle 
this by adding a - in topic specific stats.
62. ZookeeperConsumerConnector: Do we need to validate groupid?
63. ClientId: Does the clientid length need to be different from topic length?
64. AbstractFetcherThread: When building a fetch request, do we need to pass in 
brokerInfo as part of the client id? BrokerInfo contains the source broker info 
and the fetch requests are always made to the source broker.

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