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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "Release1.0Requirements" by DougCutting
Date Thu, 02 Oct 2008 19:59:29 GMT
Dear Wiki user,

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The following page has been changed by DougCutting:
http://wiki.apache.org/hadoop/Release1%2e0Requirements

------------------------------------------------------------------------------
  
  This was agreed to in a [http://markmail.org/message/flljdfpgj65zngsf thread on general@].
 There will be three separate projects, mapred, hdfs, and a library of common APIs and utilities
(fs, io, conf, etc. packages).
  
- === RPC versioning ===
+ === Multi-language serialization ===
  
     * A serialization format that will allow non-java clients to be supported. Note 1.0 does
not need to provide non-java clients but we should be able to support them before going to
2.0.
  
+ ''Do you mean serialization of user objects, or RPC parameters?  We have support for multi-lingual
user objects already.  As for RPC, I don't yet see the case for forcing 1.0 to wait until
we're ready to support multiple native client libraries. --DougCutting''
+ 
+ === RPC server that's forward-friendly ===
+ 
     * RPC mechanism should be able to detect and throw exception on new methods that old
servers clearly don't implement.
  
+ ''That could be added in 1.1, no?  I don't see this as a 1.0 requirement, but maybe I'm
missing something.  What happens today when you call an undefined method?  Protocol version
mismatch, probably.  --DougCutting''
  
  == Release 2.0 Requirements ==
  

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