erenavsarogullari commented on a change in pull request #3099: Nwang/add
streamlet operator interfaces with grouping v2
URL: https://github.com/apache/incubator-heron/pull/3099#discussion_r232497765
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File path: heron/api/src/java/org/apache/heron/streamlet/Streamlet.java
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@@ -209,6 +209,15 @@
*/
<T> Streamlet<T> applyOperator(IStreamletOperator<R, T> operator);
+ /**
+ * Returns a new Streamlet by applying the operator on each element of this
streamlet.
+ * @param operator The operator to be applied
+ * @param grouper The grouper to be applied with the operator
+ * @param <T> The return type of the transform
+ * @return Streamlet containing the output of the operation
+ */
+ <T> Streamlet<T> applyOperator(IStreamletOperator<R, T> operator,
StreamGrouper grouper);
Review comment:
Do we plan to support other `Streamlet` operators for user defined grouping
(as same with `applyOperator`)?
Also, an alternative way for passing grouping as function parameter, is it
applicable to accept grouping at `Streamlet` level? (**e.g:** same level with
`setName`, `setNumPartitions` etc)
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