johnyangk commented on a change in pull request #153: [NEMO-245,247] Handle
watermark in OutputWriter and Implement unbounded word count example
URL: https://github.com/apache/incubator-nemo/pull/153#discussion_r232158185
##########
File path:
examples/beam/src/main/java/org/apache/nemo/examples/beam/WindowedWordCount.java
##########
@@ -41,19 +43,64 @@
private WindowedWordCount() {
}
+ public static final String INPUT_TYPE_BOUNDED = "bounded";
+ public static final String INPUT_TYPE_UNBOUNDED = "unbounded";
+
+
+ private static PCollection<KV<String, Long>> getSource(
+ final Pipeline p,
+ final String[] args) {
+
+ final String inputType = args[2];
+ if (inputType.compareTo(INPUT_TYPE_BOUNDED) == 0) {
+ final String inputFilePath = args[3];
+ return GenericSourceSink.read(p, inputFilePath)
+ .apply(ParDo.of(new DoFn<String, String>() {
+ @ProcessElement
+ public void processElement(@Element final String elem,
+ final OutputReceiver<String> out) {
+ final String[] splitt = elem.split("!");
+ out.outputWithTimestamp(splitt[0], new
Instant(Long.valueOf(splitt[1])));
+ }
+ }))
+ .apply(MapElements.<String, KV<String, Long>>via(new
SimpleFunction<String, KV<String, Long>>() {
+ @Override
+ public KV<String, Long> apply(final String line) {
+ final String[] words = line.split(" +");
+ final String documentId = words[0] + "#" + words[1];
+ final Long count = Long.parseLong(words[2]);
+ return KV.of(documentId, count);
+ }
+ }));
+ } else if (inputType.compareTo(INPUT_TYPE_UNBOUNDED) == 0) {
+ // unbounded
+ return p.apply(GenerateSequence
+ .from(1)
+ .withRate(2, Duration.standardSeconds(1))
Review comment:
Can you mention Nemo's watermark emission rate here?
(e.g., we set this number high enough to provide enough time for Nemo to
emit watermarks.)
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