GitHub user granthenke opened a pull request:

    https://github.com/apache/kafka/pull/910

    KAFKA-3088: (0.9 branch) broker crash on receipt of produce request w…

    …ith empty client ID
    
    - Adds  NULLABLE_STRING Type to the protocol
    - Changes client_id in the REQUEST_HEADER to NULLABLE_STRING with a default 
of ""
    - Fixes server handling of invalid ApiKey request and other invalid requests
    
    Specifically for 0.9 branch:
    - Changes legacy 'readFrom' methods to default client id to "" on read

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/granthenke/kafka null-clientid-0.9

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/kafka/pull/910.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #910
    
----
commit a369d94dad34033cb8a1ba57366fe73e161f4efa
Author: Grant Henke <granthe...@gmail.com>
Date:   2016-02-13T04:02:32Z

    KAFKA-3088: (0.9 branch) broker crash on receipt of produce request with 
empty client ID
    
    - Adds  NULLABLE_STRING Type to the protocol
    - Changes client_id in the REQUEST_HEADER to NULLABLE_STRING with a default 
of ""
    - Fixes server handling of invalid ApiKey request and other invalid requests
    Specifically for 0.9 branch:
    - Changes legacy 'readFrom' methods to default client id to "" on read

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