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public class FailureHandlingResult {
	@Nullable private final Integer executionIndex;
}

Black list

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Most long tail tasks are caused by machine problems, so the speculative execution must runs on a different machine from origin execution.

I will introduce blacklist module into Flink used for filter node when the speculative executions are request slots.

concept of black list 

Blacklist is a kind of scheduling constraint. According to 

There are several levels of blacklist, including (JobVertex, TaskManager) blacklist, (JobVertex Host) blacklist, (Job, TaskManager) blacklist, (Job, Host) blacklist, (Session, TaskManager) blacklist and (Session Host) blacklist.

I will implement (Job, Host) blacklist for speculative execution feature. In order to implement

Classes and Interfaces of (JobVertex Host) blacklist are:

Init black list 

where register?

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