Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/11249#discussion_r54170612
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StreamingContext.scala ---
@@ -269,6 +270,33 @@ class StreamingContext private[streaming] (
RDDOperationScope.withScope(sc, name, allowNesting = false,
ignoreParent = false)(body)
}
+ private[streaming] val recoverableAccuNameToAcc: mutable.Map[String,
Accumulable[_, _]] =
+ mutable.Map.empty
+
+ /**
+ * Different from accumulator in SparkContext, it will first try to
recover from Checkpoint
+ * if it exist.
+ *
+ * @param initialValue initial value of accumulator. It will be
ignored when recovering from
+ * checkpoint
+ * @param name name is required as identity to find
corresponding accumulator.
+ */
+ def getOrCreateRecoverableAccumulator[T](initialValue: T, name: String)
+ (implicit param: AccumulatorParam[T]): Accumulator[T] = {
+
+ def registerNewAccumulator(_initialV: T) : Accumulator[T] = {
+ val acc = sc.accumulator(_initialV, name)
+ recoverableAccuNameToAcc(name) = acc
+ acc
+ }
+
+ val newInitialValue: T = if (isCheckpointPresent) {
+ _cp.trackedAccs.find(_.name ==
name).map(_.value).getOrElse(initialValue).asInstanceOf[T]
+ } else initialValue
--- End diff --
Nit:
```scala
if (...) {
...
} else {
...
}
```
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