July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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Structured streaming
Structured streaming is new in Apache Spark 2.0+ and is now in GA from Spark 2.2 release. You will see details in the next section along with examples of how to use structured streaming.
For more details on the Kafka integration in structured streaming, refer to https://spark.apache.org/docs/latest/structured-streaming-kafka-integration.html.
An example of how to use Kafka source stream in structured streaming is as follows:
val ds1 = spark .readStream .format("Kafka") .option("Kafka.bootstrap.servers", "host1:port1,host2:port2") .option("subscribe", "topic1") .load()ds1.selectExpr("CAST(key AS STRING)", "CAST(value AS STRING)") .as[(String, String)]
An example of how to use Kafka source instead of source stream (in case ...
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