apache-spark Archives

apache-spark, Programming

IT Nursery

How to stop INFO messages displaying on spark console?

I’d like to stop various messages that are coming on spark shell. I tried to edit the log4j.properties file in order to stop ...

May 29, 2022
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What is the difference between cache and persist?

In terms of RDD persistence, what are the differences between cache() and persist() in spark ? 6 Answers 6

May 26, 2022
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What are workers, executors, cores in Spark Standalone cluster?

I read Cluster Mode Overview and I still can’t understand the different processes in the Spark Standalone cluster and the parallelism. Is the ...

May 20, 2022
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How to show full column content in a Spark Dataframe?

I am using spark-csv to load data into a DataFrame. I want to do a simple query and display the content: val df ...

May 18, 2022
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What is the difference between map and flatMap and a good use case for each?

Can someone explain to me the difference between map and flatMap and what is a good use case for each? What does “flatten ...

May 18, 2022
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Spark – repartition() vs coalesce()

According to Learning Spark Keep in mind that repartitioning your data is a fairly expensive operation. Spark also has an optimized version of ...

May 10, 2022
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