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https://reviews.apache.org/r/18708/
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(Updated March 13, 2014, 3:58 p.m.)


Review request for Ambari, Dmytro Sen, Sumit Mohanty, and Tom Beerbower.


Bugs: AMBARI-4782
    https://issues.apache.org/jira/browse/AMBARI-4782


Repository: ambari


Description
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The general idea is to replace "state" property at user predicate (for 
HostComponent update requests) with desired_state to comply with current usage 
and keep all hack in one place. This is done at UpdateHandler. 
We can not do that later, because request type information (GET or PUT) is not 
available at this time. Changing url parameters before compiling predicate 
seems more hacky for me. That's why I implemented a visitor that iterates over 
predicate and replaces properties. The code that is executed afterwards 
transparently works with "desired_state" property instead of "state" property. 
Get requests are processed at natural way, "state" is mapped to live state for 
all requests except update requests.

Need more work on replacing "state" property in request body.


Diffs (updated)
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ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java
 5f85d83 
  
ambari-server/src/main/java/org/apache/ambari/server/controller/ServiceComponentHostRequest.java
 d9c7928 
  
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/HostComponentResourceProvider.java
 89d53ae 

Diff: https://reviews.apache.org/r/18708/diff/


Testing
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Here is a preview version of patch (without unit tests).  Not wll-tested 
end2end yet.


Thanks,

Dmitro Lisnichenko

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