[英]How to stream a single topic of kafka , filter by key into multiple location of hdfs?
I am not being to stream my data on multiple hdfs location , which is filtered by key.我不会在多个 hdfs 位置上流式传输我的数据,这些位置是通过键过滤的。 So below code is not working.
所以下面的代码不起作用。 Please help me to find the correct way to write this code
请帮助我找到编写此代码的正确方法
val ER_stream_V1 = spark
.readStream
.format("kafka")
.option("kafka.bootstrap.servers", configManager.getString("Kafka.Server"))
.option("subscribe", "Topic1")
.option("startingOffsets", "latest")
.option("failOnDataLoss", "false")
.load()
val ER_stream_V2 = spark
.readStream
.format("kafka")
.option("kafka.bootstrap.servers", configManager.getString("Kafka.Server"))
.option("subscribe", "Topic1")
.option("startingOffsets", "latest")
.option("failOnDataLoss", "false")
.load()
ER_stream_V1.toDF()
.select(col("key"), col("value").cast("string"))
.filter(col("key")==="Value1")
.select(functions.from_json(col("value").cast("string"), Value1Schema.schemaExecution).as("value")).select("value.*")
.writeStream
.format("orc")
.option("metastoreUri", configManager.getString("spark.datasource.hive.warehouse.metastoreUri"))
.option("checkpointLocation", "/tmp/teststreaming/execution/checkpoint2005")
.option("path", "/tmp/test/value1")
.trigger(Trigger.ProcessingTime("5 Seconds"))
.partitionBy("jobid")
.start()
ER_stream_V2.toDF()
.select(col("key"), col("value").cast("string"))
.filter(col("key")==="Value2")
.select(functions.from_json(col("value").cast("string"), Value2Schema.schemaJobParameters).as("value"))
.select("value.*")
.writeStream
.format("orc")
.option("metastoreUri", configManager.getString("spark.datasource.hive.warehouse.metastoreUri"))
.option("checkpointLocation", "/tmp/teststreaming/jobparameters/checkpoint2006")
.option("path", "/tmp/test/value2")
.trigger(Trigger.ProcessingTime("5 Seconds"))
.partitionBy("jobid")
.start()
You should not need two readers.你不应该需要两个读者。 Create one and filter twice.
创建一个并过滤两次。 You might also want to consider
startingOffsets
as earliest
to read existing topic data您可能还需要考虑将
startingOffsets
earliest
用于读取现有主题数据
For example.例如。
val ER_stream = spark
.readStream
.format("kafka")
.option("kafka.bootstrap.servers", configManager.getString("Kafka.Server"))
.option("subscribe", "Topic1")
.option("startingOffsets", "latest") // maybe change?
.option("failOnDataLoss", "false")
.load()
.toDF()
.select(col("key").cast("string").as("key"), col("value").cast("string"))
val value1Stream = ER_stream
.filter(col("key") === "Value1")
.select(functions.from_json(col("value"), Value1Schema.schemaExecution).as("value"))
.select("value.*")
val value2Stream = ER_stream
.filter(col("key") === "Value2")
.select(functions.from_json(col("value"), Value2Schema.schemaJobParameters).as("value"))
.select("value.*")
value1Stream.writeStream.format("orc")
...
.start()
value2Stream.writeStream.format("orc")
...
.start()
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