Revision c2610080

b/doc/design-reason-trail.rst
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Implementation
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==============
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The OpCode base class will be modified to include a new field, OP_REASON.


  		





  
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The OpCode base class will be modified to include a new parameter, "reason".


  		





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This will receive the reason trail as built by all the previous steps.


  		





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When an OpCode is added to a job (in jqueue.py) the job number and the opcode


  		





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index will be recorded as the reason for the existence of that opcode.


  		





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The implementation of this design will start from the operations that affect the


  		





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instance status. They will be changed so that the "reason" is passed to them.


  		





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They will then export the new expected instance status, together


  		





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with the associated reason for the monitoring daemon.


  		





  
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From the command line tools down to the opcodes, the implementation of this


  		





  
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design will be shared by all the components of the system. After the opcodes


  		





  
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have been enqueued in a job queue and are dispatched for execution, the


  		





  
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implementation will have to be OpCode specific because of the current


  		





  
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structure of the ganeti backend.


  		





  
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The implementation of opcode-specific parts will start from the operations that


  		





  
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affect the instance status (as required by the design document about the


  		





  
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monitoring daemon, for the instance status data collector). Such opcodes will


  		





  
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be changed so that the "reason" is passed to them and they will then export


  		





  
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the reason trail on a file.


  		





  
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The implementation for other opcodes will follow when required.


  		





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