Yes, it should be initialized with the value 0. This is because values are added to the accumulator by a loop. If the accumulator does not start at the value 0, it will not contain the correct total of the numbers that were added to it when the loop ends.
Accumulator Variable:
Accumulators are variables that can effectively support parallel processing because they can only be "added" to through an associative and commutative operation. They can be utilized to implement counters or sums (like in MapReduce).
Programmers can add support for new types, and Spark already supports accumulators of numeric types by default.
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