2 Jul 2019 Hadoop security GroupMappingServiceProvider exception for Spark job via < init>(SparkContext.scala:295) at org.apache.spark.api.java.
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WebHooks. WebHooks allow you to get HTTP POST notifications when a Formstack form is submitted. Push submitted data to other services or custom scripts. Sending HTML Form Data in ASP.NET Web API: Form-urlencoded Data. Based on your sample code I'm not sure if you need a complex type from the form data or just a single integer based on the UploadFiles(int clientContactId) method in your API Controller.
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Debug Info for Spark DataFrame Tidying methods for Spark ML Principal Component Analysis Access the Spark API. You can manage Spark memory limits programmatically (by the API).