Ewan Leith questions

Ewan Leith answers

• SparkSQL, Thrift Server and Tableau
• Spark-submit / spark-shell > difference between yarn-client and yarn-cluster mode
• Saving to parquet subpartition
• Spark + EMR using Amazon's "maximizeResourceAllocation" setting does not use all cores/vcores
• Why does Apache Spark read unnecessary Parquet columns within nested structures?
• What is RDD in spark
• Apply encryption to existing S3 objects without impacting storage class