nwangtw commented on a change in pull request #3109: Add withStream() in
Streamlet to support stream selection
URL: https://github.com/apache/incubator-heron/pull/3109#discussion_r233266843
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File path: heron/api/src/java/org/apache/heron/streamlet/Streamlet.java
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@@ -71,6 +71,22 @@
*/
int getNumPartitions();
+ /**
+ * Set the id of the stream to be used by the children nodes.
+ * Usage (assuming source is a Streamlet object with two output streams:
stream1 and stream2):
+ * source.withStream("stream1").filter(...).log();
+ * source.withStream("stream2").filter(...).log();
+ * @param streamId The specified stream id
+ * @return Returns back the Streamlet with changed stream id
+ */
+ Streamlet<R> withStream(String streamId);
Review comment:
Yeah. A component can generates multiple different streams (such as 3
integer streams: odd, even, all) and the next component needs to specify which
one to accept data.
UI doesn't show this information currently and it could be a useful feature
to add. And grouping strategy is another important information on the edges.
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