January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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CPU cores
The central processing unit (CPU) is the resource where the computation happens. Modern machines come with more than one CPU core, allowing users to run multiple applications in parallel. As discussed in Chapter 5, Spark Architecture and Application Execution Flow, tasks for your Spark jobs get executed on these cores. Thus, the degree of parallelism also depends on the number of cores available. This means if you have 1,000 cores available and the total number of partitions is 2,000, then Spark will first schedule the 1,000 tasks for each partition and then run the remaining ones after the completion of the first 1,000 tasks.
We have already discussed how we can control these resources while submitting our job. But it is a good ...
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