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[SPARK-17880][DOC] The url linking to AccumulatorV2 in the document is incorrect. #15439

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[SPARK-17880][DOC] The url linking to AccumulatorV2 in the document is incorrect. #15439

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2 changes: 1 addition & 1 deletion docs/programming-guide.md
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Expand Up @@ -1373,7 +1373,7 @@ res2: Long = 10
{% endhighlight %}

While this code used the built-in support for accumulators of type Long, programmers can also
create their own types by subclassing [AccumulatorV2](api/scala/index.html#org.apache.spark.AccumulatorV2).
create their own types by subclassing [AccumulatorV2](api/scala/index.html#org.apache.spark.util.AccumulatorV2).
The AccumulatorV2 abstract class has several methods which need to override:
`reset` for resetting the accumulator to zero, and `add` for add anothor value into the accumulator, `merge` for merging another same-type accumulator into this one. Other methods need to override can refer to scala API document. For example, supposing we had a `MyVector` class
representing mathematical vectors, we could write:
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