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https://issues.apache.org/jira/browse/HADOOP-13363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15368893#comment-15368893
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Tsuyoshi Ozawa commented on HADOOP-13363:
-----------------------------------------

>From CHANGES.txt: https://github.com/google/protobuf/blob/master/CHANGES.txt

{quote}
2.6.1 

  Java
  * Updated DynamicMessage.setField() to handle repeated enum values
    correctly.
  * Fixed a bug that caused NullPointerException to be thrown when
    converting manually constructed FileDescriptorProto to
    FileDescriptor.
{quote}


{quote}
2.6.0

General
  General
  * Added oneofs(unions) feature. Fields in the same oneof will share
    memory and at most one field can be set at the same time. Use the
    oneof keyword to define a oneof like:
{code}
      message SampleMessage {
        oneof test_oneof {
          string name = 4;
          YourMessage sub_message = 9;
        }
      }
{code}
  * Files, services, enums, messages, methods and enum values can be marked
    as deprecated now.
  * Added Support for list values, including lists of messages, when
    parsing text-formatted protos in C++ and Java.
      For example:  foo: [1, 2, 3]
...
Java
  * writeTo() method in ByteString can now write a substring to an
    output stream. Added endWith() method for ByteString.
  * ByteString and ByteBuffer are now supported in CodedInputStream
    and CodedOutputStream.
  * java_generate_equals_and_hash can now be used with the LITE_RUNTIME.
{quote}

> Upgrade protobuf from 2.5.0 to something newer
> ----------------------------------------------
>
>                 Key: HADOOP-13363
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13363
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: build
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Allen Wittenauer
>
> Standard protobuf 2.5.0 does not work properly on many platforms.  (See, for 
> example, https://gist.github.com/BennettSmith/7111094 ).  In order for us to 
> avoid crazy work arounds in the build environment and the fact that 2.5.0 is 
> starting to slowly disappear as a standard install-able package for even 
> Linux/x86, we need to either upgrade or self bundle or something else.



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