johnyangk opened a new pull request #100: [NEMO-178] Compile-time task cloning
URL: https://github.com/apache/incubator-nemo/pull/100
 
 
   JIRA: [NEMO-178: Compile-time task 
cloning](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-178)
   
   **Major changes:**
   - Compiler: Introduces ClonedSchedulingProperty
   - Runtime: Includes clone offsets in block ids and task ids, such that each 
clone is managed with its own state machines, and introduces 
Stage#getAllPossiblyClonedTaskIdsShuffled() to schedule/manage clones
   
   **Minor changes to note:**
   - RuntimeIdGenerator -> RuntimeIdManager
   - Removes the first hyphens from the ids (e.g., vertex-4 => vertex4)
   
   **Tests for the changes:**
   - WordCountITCase#testClonedScheduling produces correct results
   
   **Other comments:**
   - Two major limitations of the current implementation will be addressed in 
future PRs.
   - (1) No one vertex in an IR DAG can have a different # of clones.
   - (2) *ALL* of the clones are always scheduled, and the vertex is considered 
complete after all of clones finish.
   
   resolves 
[NEMO-178](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-178)
   

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