August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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Utilizing partitionBy operation
This repartitioning operation enables you to partition the stream on the basis of the fields in the tuples. For example, if you want all the tweets from a particular user to go to the same target partition, then you can partition the tweet stream by applying partitionBy to the username field in the following manner:
mystream.partitionBy(new Fields("username")).each(new Fields("username","text"), new myFilter()).parallelismHint(2)
The partitionBy operation applies the following formula to decide the target partition:
Target Partition = hash(fields) % (number of target partition)
As the preceding formula shows, the partitionBy operation calculates the hash of the input fields to decide the target partition. ...
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