Wangda Tan created YARN-1871:
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Summary: We should eliminate writing *PBImpl code in YARN
Key: YARN-1871
URL: https://issues.apache.org/jira/browse/YARN-1871
Project: Hadoop YARN
Issue Type: Improvement
Components: api
Affects Versions: 2.4.0
Reporter: Wangda Tan
Assignee: Wangda Tan
Currently, We need write PBImpl classes one by one. After running "find . -name
"*PBImpl*.java" | xargs wc -l" under hadoop source code directory, we can see,
there're more than 25,000 LOC. I think we should improve this, which will be
very helpful for YARN developers to make changes for YARN protocols.
There're only some limited patterns in current *PBImpl,
* Simple types, like string, int32, float.
* List<?> types
* Map<?> types
* Enum types
Code generation should be enough to generate such PBImpl classes.
Some other requirements are,
* Leave other related code alone, like service implemention (e.g.
ContainerManagerImpl).
* (If possible) Forward compatibility, developpers can write their own PBImpl
or genereate them.
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