initial value of accumulator
helper object defining how to add elements of type T
Merge two accumulable objects together
Merge two accumulable objects together
Normally, a user will not want to use this version, but will instead call +=
.
the other R
that will get merged with this
Add more data to this accumulator / accumulable
Add more data to this accumulator / accumulable
Get the current value of this accumulator from within a task.
Get the current value of this accumulator from within a task.
This is NOT the global value of the accumulator. To get the global value after a
completed operation on the dataset, call value
.
The typical use of this method is to directly mutate the local value, eg., to add an element to a Set.
Merge two accumulable objects together
Merge two accumulable objects together
Normally, a user will not want to use this version, but will instead call add
.
the other R
that will get merged with this
Set the accumulator's value; only allowed on master
Set the accumulator's value; only allowed on master
Access the accumulator's current value; only allowed on master.
Access the accumulator's current value; only allowed on master.
Set the accumulator's value; only allowed on master.
Set the accumulator's value; only allowed on master.
A simpler value of Accumulable where the result type being accumulated is the same as the types of elements being merged.
result type