structuredStream

• Input: Kafka, HDFS, S3, Socket,

• Output:

  • Kafka
  • Files (json, parquet, csv, ...)
  • Console (for testing)
  • Memory (for debugin)

• Output mode (how output data):

  • Append: add only new records
  • Update: add updated records
  • Complete: add all records

• Triggers (when output data):

• Event time processing

• Watermarks ??

Notes

• Infer schema is disabled by default in Streaming to enable it use : spark.sql.streaming.schemaInference=true
• To control how quickly Spark will read all of the files in folder, add the option maxFilesPerTrigger to Dataframe
• Spark Structured Streaming 2.2 do not support chained aggregations