September 2017
Beginner to intermediate
360 pages
8h 13m
English
book
Practical Real-time Data Processing and Analytics
by Shilpi Saxena, Selva raj Ramasamy, Prateek Bhati, Saurabh Gupta
Content preview from Practical Real-time Data Processing and Analytics
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Broadcast variables
These are the variables that the programmer intends to share to all execution units throughout the cluster. Though they sound very simple to work with, there are a few aspects the programmers need to be cognizant of while working with broadcast variables: they need to be able to fit in the memory of each node in the cluster—they are like local read-only dictionary/index for each node, thus they can't be huge in size, and all nodes share same values thus they are read-only by design. Say, for instance, we have a dictionary for spell check, we would want each node to have the same copy.
So to summarize, here are the major caveats/features of the design and usage of broadcast variables:
- They are immutable
- They are distributed ...
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