To answer my own question,
I was declaring the accumulator incorrectly. The code should look like this:
scala> import org.apache.spark.AccumulatorParam
import org.apache.spark.AccumulatorParam
scala> :paste
// Entering paste mode (ctrl-D to finish)
implicit object BigIntAccumulatorParam extends AccumulatorParam[BigInt] {
def addInPlace(t1: BigInt, t2: BigInt) = t1 + t2
def zero(initialValue: BigInt) = BigInt(0)
}
// Exiting paste mode, now interpreting.
defined module BigIntAccumulatorParam
scala> val accu = sc.accumulator(BigInt(0))(BigIntAccumulatorParam)
accu: org.apache.spark.Accumulator[scala.math.BigInt] = 0
scala> accu += 100
scala> accu.value
res1: scala.math.BigInt = 100
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