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Recent questions tagged Spark
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spark streaming - Custom partiotioning of JavaDStreamPairRDD
In Spark streaming, what's the recommended way to implement a custom partiotioner on DStreams? I've ... equivalent on JavaDStreamPairRDD. Thanks See Question&Answers more detail:os...
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spark streaming: select record with max timestamp for each id in dataframe (pyspark)
I have a dataframe with schema - |-- record_id: integer (nullable = true) |-- Data1: string (nullable ... is not supported in streaming. See Question&Answers more detail:os...
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spark reading data from mysql in parallel
Im trying to read data from mysql and write it back to parquet file in s3 with specific partitions as follows ... write partial data to parquet? See Question&Answers more detail:os...
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spark + sbt-assembly: "deduplicate: different file contents found in the following"
I ran spark application and wanna pack the test classes into the fat jar. What is weird is I ran ... ) Project.inConfig(Test)(assemblySettings) See Question&Answers more detail:os...
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spark dataframe - combine text from multiple rows in pyspark
I created a PySpark dataframe using the following code testlist = [ {"category":"A","name":"A1"}, {"category" ... best way to make this happen ? See Question&Answers more detail:os...
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Oct 17, 2021
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spark dataframe drop duplicates and keep first
Question: in pandas when dropping duplicates you can specify which columns to keep. Is there an equivalent in Spark ... about the last row ? See Question&Answers more detail:os...
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Oct 17, 2021
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spark createOrReplaceTempView vs createGlobalTempView
Spark Dataset 2.0 provides two functions createOrReplaceTempView and createGlobalTempView. I am not able to understand ... sparkSession.close()? See Question&Answers more detail:os...
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Oct 17, 2021
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spark dataframe - Applying a Window function to calculate differences in pySpark
I am using pySpark, and have set up my dataframe with two columns representing a daily asset price as follows: ind = ... I am unable to see how. See Question&Answers more detail:os...
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