January 2019
Beginner to intermediate
154 pages
4h 31m
English
Content preview from Apache Spark Quick Start Guide
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Resilient metadata
As we have discussed, apart from partitions, an RDD also stores some metadata within it. This metadata helps Spark to recompute an RDD partition in the case of failure and also provides optimizations while performing operations.
The metadata includes the following:
- A list of parent RDD dependencies
- A function to compute a partition from the list of parent RDDs
- The preferred location for the partitions
- The partitioning information, in case of pair RDDs
Right then, enough theory! Let's create a simple program and understand the concepts in more detail in the next section.
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