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From "Prashanth Menon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-49) Add acknowledgement to the produce request.
Date Tue, 06 Mar 2012 03:41:01 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-49?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222975#comment-13222975
] 

Prashanth Menon commented on KAFKA-49:
--------------------------------------

Sounds good to me.  Doing some additional work on DefaultEventHandler, I noticed something
off in the retry logic that I'd like to get confirmed.  Consider the case where I've got data
destined for more than one broker, say three.  
- Enter handleSerializedData()
  - Partioning and collating makes a map with three key/value pairs (broker -> topic partition
data and messages).  
  - Enter for loop
    - Assume the first send works on the first try for broker #1.  
    - Next iteration, the second send to broker #2 fails on the first try, we fall into the
retry loop and recursive into handleSerializedData with requiredRetries = 0.
      - In handleSerializedData
      - This time, the partitioned data will one one key/value pair for the single broker
(broker #2) we're attempting to resend data to.  
      - Enter for loop
        - Attempt to send data to broker #2, the send succeeds
      - We exhaust the map entries and the for loop condition.
    - We return to the retry loop for retry=1 on broker #2 in the catch block.  
    - The previous send succeeded on first try and now there's the "return" statement.  This
exists the function, but we have one more broker (broker #3) to send data to.

Does the flow sound about right?  I think what needs to happen is to set a flag and break
the retry while loop after a successful retry.  Then we check the flag after the loop and
either throw the exception or continue the outer for loop.

Am I crazy?  Am I missing something in my sleep-deprived state here?
                
> Add acknowledgement to the produce request.
> -------------------------------------------
>
>                 Key: KAFKA-49
>                 URL: https://issues.apache.org/jira/browse/KAFKA-49
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jun Rao
>            Assignee: Prashanth Menon
>
> Currently, the produce request doesn't get acknowledged. We need to have a broker send
a response to the producer and have the producer wait for the response before sending the
next request.

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