February 2017
Intermediate to advanced
274 pages
5h 58m
English
Content preview from Learning PySpark
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What is the Spark Streaming application data flow?
The following figure provides the data flow between the Spark driver, workers, streaming sources and targets:
It all starts with the Spark Streaming Context, represented by ssc.start() in the preceding figure:
- When the Spark Streaming Context starts, the driver will execute a long-running task on the executors (that is, the Spark workers).
- The Receiver on the executors (Executor 1 in this diagram) receives a data stream from the Streaming Sources. With the incoming data stream, the receiver divides the stream into blocks and keeps these blocks in memory.
- These blocks are also replicated to another executor ...
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