Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/10385#discussion_r48310785
--- Diff:
examples/src/main/java/org/apache/spark/examples/streaming/JavaRecoverableNetworkWordCount.java
---
@@ -41,7 +46,48 @@
import org.apache.spark.streaming.api.java.JavaStreamingContextFactory;
/**
- * Counts words in text encoded with UTF8 received from the network every
second.
+ * Use this singleton to get or register `Broadcast`.
+ */
+class JavaWordBlacklist {
+
+ private static volatile Broadcast<List<String>> instance = null;
+
+ public static Broadcast<List<String>> getInstance(JavaSparkContext jsc) {
+ if (instance == null) {
+ synchronized (WordBlacklist.class) {
+ if (instance == null) {
+ List<String> wordBlacklist = Arrays.asList("a", "b", "c");
+ instance = jsc.broadcast(wordBlacklist);
+ }
+ }
+ }
+ return instance;
+ }
+}
+
+/**
+ * Use this singleton to get or register `Accumulator`.
--- End diff --
Similar comment as above for Broadcast.. "an accumulator"
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