Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/1309#discussion_r14695474
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -758,6 +758,16 @@ class SparkContext(config: SparkConf) extends Logging {
new Accumulator(initialValue, param)
/**
+ * Create an [[org.apache.spark.Accumulator]] variable of a given type,
which tasks can "add"
+ * values to using the `+=` method. Only the driver can access the
accumulator's `value`.
+ *
+ * This version adds a custom name to the accumulator for display in the
Spark UI.
--- End diff --
It would be nice to have a short code example here (or somewhere in the
documentation) showing how you can create of these and use it
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