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This article shows you how to read and write XML files in Spark. Sample XML file Create a sample XML file named test.xml with the following content: <?xml version="1.0"?> <data> <record id="1"> <rid>1</rid> <nam...

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This article shows how to convert a Python dictionary list to a DataFrame in Spark using Python. Example dictionary list data = [{"Category": 'Category A', "ID": 1, "Value": 12.40}, {"Category": 'Category B', "ID": 2, "Value": 30.10}, {"Category": 'Category C', "...

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Sometime it is necessary to pass environment variables to Spark executors. To pass environment variable to executors, use setExecutorEnv function of SparkConf class. Code snippet In the following code snippet, an environment variable name ENV_NAME is set up with value ...

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Spark provides rich APIs to save data frames to many different formats of files such as CSV, Parquet, Orc, Avro, etc. CSV is commonly used in data application though nowadays binary formats are getting momentum. In this article, I am going to show you how to save Spark data frame as CSV file in b...

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This code snippet shows how to convert string to date.

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This code snippet shows how to convert string to date.

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Parquet is columnar store format published by Apache. It's commonly used in Hadoop ecosystem. There are many programming language APIs that have been implemented to support writing and reading parquet files. 

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Parquet is columnar store format published by Apache. It's commonly used in Hadoop ecosystem. There are many programming language APIs that have been implemented to support writing and reading parquet files. 

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When submitting Spark applications to YARN cluster, two deploy modes can be used: client and cluster. For client mode (default), Spark driver runs on the machine that the Spark application was submitted while for cluster mode, the driver runs on a random node in a cluster. On this page, I am goin...

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Scenario Recently I created an Oozie workflow which contains one Spark action. The Spark action master is yarn and deploy mode is cluster. Each time when the job runs about 30 minutes, the application fails with errors like the following: Application applicatio...

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