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From Vinayakumar B <vinayakum...@apache.org>
Subject [NOTICE] Removal of protobuf classes from Hadoop Token's public APIs' signature
Date Wed, 08 Jan 2020 12:40:04 GMT
Hi All,

   This mail is to notify about the Removal of following public APIs from
Hadoop Common.

     ClassName: org.apache.hadoop.security.token.Token
     APIs:
         public Token(TokenProto tokenPB);
         public TokenProto toTokenProto();

   Reason: These APIs are having Generated protobuf classes in the
signature. Right now due to protobuf upgrade in trunk (soon to be 3.3.0
release) these APIs are breaking the downstream builds, even though
downstreams dont use these APIs (just Loading Token class). Downstreams are
still referencing having older version (2.5.0) of protobuf, hence build is
being broken.

    These APIs were added for the internal purpose(HADOOP-12563), to
support serializing tokens using protobuf in UGI Credentials.
Same purpose can be achieved using the Helper classes without introducing
protobuf classes in API signatures.

Token.java is marked as Evolving, so I believe APIs can be changed whenever
absolute necessary.

    Jira https://issues.apache.org/jira/browse/HADOOP-16621 has been
reported to solve downstream build failure.

So since this API was added for internal purpose easy approach to solve
this is to remove APIs and use helper classes. Otherwise, as mentioned in
HADOOP-16621, workaround will add unnecessary codes to be maintained.

If anyone using these APIs outside hadoop project accidentally, please
reply to this mail immediately.

If no objection by next week, will go ahead with removal of above said APIs
in HADOOP-16621.

-Vinay

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