bharath kumar avusherla created SPARK-23869:
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Summary: Spark 2.3.0 left outer join not emitting null values
instead waiting for the record in other stream
Key: SPARK-23869
URL: https://issues.apache.org/jira/browse/SPARK-23869
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.3.0
Reporter: bharath kumar avusherla
Left outer join on two streams not emitting the null outputs. It is just
waiting for the record to be added to other stream. Using socketstream to test
this.
Details of the watermarks and intervals are:
val ds1Map = ds1
.selectExpr("Id AS ds1_Id", "ds1_timestamp")
.withWatermark("ds1_timestamp","10 seconds")
val ds2Map = ds2
.selectExpr("Id AS ds2_Id", "ds2_timestamp")
.withWatermark("ds2_timestamp", "20 seconds")
val output = ds1Map.join( ds2Map,
expr(
""" ds1_Id = ds2_Id AND ds2_timestamp >= ds1_timestamp AND ds2_timestamp <=
ds1_timestamp + interval 1 minutes """),
"leftOuter")
val query = output.select("*")
.writeStream
.outputMode(OutputMode.Append)
.format("console")
.option("checkpointLocation", "./ewe-spark-checkpoints/")
.start()
query.awaitTermination()
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