jeongyooneo commented on a change in pull request #30: [NEMO-63] On-demand 
dynamic optimization metric aggregation
URL: https://github.com/apache/incubator-nemo/pull/30#discussion_r194646153
 
 

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 File path: 
common/src/main/java/edu/snu/nemo/common/ir/vertex/MetricCollectionBarrierVertex.java
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 @@ -29,7 +29,9 @@
  */
 public final class MetricCollectionBarrierVertex<T> extends IRVertex {
   // Partition ID to Size data
 
 Review comment:
   It would have been great only if we can extract block id from task id. But 
unfortunately, currently block id cannot be extracted from task id and vice 
versa - block id requires runtime edge id which cannot be parsed from task id, 
and task id requires stage id which cannot be parsed from block id.
   
   I think this problem will be naturally handled with NEMO-100, via 
refactoring RuntimeIdGenerator.

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