Tag: big_data_interview
Optimizing PySpark queries with adaptive query execution – (AQE) – Example included
Spark 3+ brought numerous enhancements and features, and one of the notable ones is Adaptive Query Execution (AQE). AQE is…
PySpark : Calculate the Euclidean distance or the square root of the sum of the squares of its arguments using PySpark.
In PySpark, the hypot function is a mathematical function used to calculate the Euclidean distance or the square root of…
PySpark : How to perform compute covariance using covar_pop and covar_samp with PySpark
Covariance is a statistical measure that indicates the extent to which two variables change together. If the variables increase and…
Navigating job dependencies in AWS glue – Managing ETL workflows
AWS Glue manages dependencies between jobs using triggers. Triggers can start jobs based on the completion status of other jobs,…
Spark repartition() vs coalesce() – A complete information
In PySpark, managing data across different partitions is crucial for optimizing performance, especially for large-scale data processing tasks. Two methods…
Grouping and aggregating multi-column data with PySpark – Complete example included
The groupBy function is widely used in PySpark SQL to group the DataFrame based on one or multiple columns, apply…
Aggregating Insights: A deep dive into the fold function in PySpark with practical examples
Understanding spark RDDs RDDs are immutable, distributed collections of objects, and are the backbone of Spark. RDDs enable fault-tolerant parallel…
Converting delimiter-separated strings to array columns using PySpark
PySpark allows for a seamless and efficient way to handle big data processing and manipulation tasks. In this article, we…
Spark’s cluster connectivity issues – AppClient$ClientActor – SparkDeploySchedulerBackend – TaskSchedulerImpl
Apache Spark, a powerful tool for distributed computing, occasionally confronts users with connectivity and cluster health issues. Among them, the…
Navigating Hadoop’s start-all.sh Connection refused’ challenge: Causes and resolutions
Hadoop, a popular framework for distributed storage and processing, frequently confronts newcomers and sometimes even experienced users with errors that…
