A dummy counter handling context for fetch tasks
This class is responsible for executing the fetch task, saving the result to disk and do the necessary cleanup afterwards.
FetchOptimizer determines whether the entire physical plan is fetchable, meaning that the task's result can be directly read (fetched) from the underlying storage rather than creating MR jobs.
This class is used to have a POStore write the output to the underlying storage via a output collector/record writer in case of a fetch task.
A dummy ProgressableReporter used for fetch tasks
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