Github user harishreedharan commented on a diff in the pull request:
https://github.com/apache/spark/pull/1195#discussion_r15494899
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/Receiver.scala ---
@@ -125,6 +125,16 @@ abstract class Receiver[T](val storageLevel:
StorageLevel) extends Serializable
}
/**
+ * Store an ArrayBuffer of received data as a data block into Spark's
memory. The callback is
+ * called when the data is safely stored. This callback can be used to
commit transactions
+ * with systems from which data is being sent etc.
+ */
+ @Experimental
+ def storeReliably(dataBuffer: ArrayBuffer[T], callback: Option[() =>
Unit]) {
--- End diff --
The only issue is that there is nothing that stops a buggy receiver to call
storeReliably(buffer, null). This just protects against this - else we'd have
to explicitly do a null check.
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