Chyler commented on a change in pull request #37: TEZ-4042: Speculative 
attempts should avoid running on the same node
URL: https://github.com/apache/tez/pull/37#discussion_r259385562
 
 

 ##########
 File path: tez-dag/src/main/java/org/apache/tez/dag/app/dag/impl/TaskImpl.java
 ##########
 @@ -149,6 +152,8 @@
   // track the status of TaskAttempt (true mean completed, false mean 
uncompleted)
   private final Map<Integer, Boolean> taskAttemptStatus = new 
HashMap<Integer,Boolean>();
 
+  private final Set<NodeId> unhealthyNodesHistory = new HashSet<>();
 
 Review comment:
   updated as suggested.

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