The partitionBy() method, which is used to write a DataFrame to disk in partitions, creates one sub-folder (partition-folder) for each unique value of the specified column.

The reason for that is because this method doesn’t define the physical partitioning of the output, to do so we will need the following method.

When these are saved to disk, all part-files are written to a single directory. The repartition() method, which is used to change the number of in-memory partitions by which the data set is distributed across Spark executors.With respect to managing partitions, Spark provides two main methods via its DataFrame API:

As part of this, Spark has the ability to write partitioned data directly into sub-folders on disk for efficient reads by big data tooling, including other Spark jobs. Spark splits data into partitions, then executes operations in parallel, supporting faster processing of larger datasets than would otherwise be possible on single machines. Spark’s parallelism is primarily connected to partitions, which represent logical chunks of a large, distributed dataset. One of the tools that we use to support this work is Apache Spark, a unified analytics engine for large-scale data processing. One of the interesting challenges that the ZipRecruiter Employer Data team faces is processing frequent changes to the corpus of tens of millions of jobs quickly, while still enabling fast and efficient reads for downstream processes that perform further data transformations or machine learning.

If you’re interested in finding solutions to problems like these, please visit our Careers page to see open roles. This article shares some insight into the challenges the ZipRecruiter Tech Team works on every day.

Lzip file spark