Performing customized data compaction for efficient parallel data processing amongst a set of computing resources

Described is a system and method for compacting data into customized (e.g. optimal) file sizes for processing by computing resources. The mechanism may leverage various computing resources such as a cluster computing frameworks combined with a stream processing platform to efficiently process the activity data. For example, activity data of an organization may be processed by a set of jobs (or sub-jobs) as part of a data stream by a set of distributed computing resources. In order to efficiently process such data, the mechanism may compact the data into customized (e.g. optimal) file sizes. For example, the customized file sizes may provide an optimal (or near optimal) amount of data to be processed by each job, for example, to improve performance.