August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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All grouping
All grouping is a special grouping that does not partition the tuples but replicates them to all the tasks, that is, each tuple will be sent to each of the bolt's tasks for processing.
One common use case of all grouping is for sending signals to bolts. For example, if you are doing some kind of filtering on the streams, you can pass or change the filter parameters to all the bolts by sending them those parameters over a stream that is subscribed by all the bolt's tasks with an all grouping. Another example is to send a reset message to all the tasks in an aggregation bolt.
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