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_r235448468
##########
File path:
heron/api/src/java/org/apache/heron/streamlet/impl/StreamletImpl.java
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@@ -205,11 +207,37 @@ public int getNumPartitions() {
return nPartitions;
}
+ /**
+ * 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
+ */
+ @SuppressWarnings("HiddenField")
+ @Override
+ public Streamlet<R> withStream(String streamId) {
Review comment:
Heron has a check already and it runs during submission time. Not as good as
compile time but should be fast enough. :)
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