August 2017
Beginner to intermediate
284 pages
6h 51m
English
Content preview from Mastering Apache Storm
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Rebalance the parallelism of a topology
As explained in the previous chapter, one of the key features of Storm is that it allows us to modify the parallelism of a topology at runtime. The process of updating a topology parallelism at runtime is called rebalance.
There are two ways to rebalance the topology:
- Using Storm Web UI
- Using Storm CLI
The Storm Web UI was covered in the previous chapter. This section covers how we can rebalance the topology using the Storm CLI tool. Here are the commands that we need to execute on Storm CLI to rebalance the topology:
> bin/storm rebalance [TopologyName] -n [NumberOfWorkers] -e [Spout]=[NumberOfExecutos] -e [Bolt1]=[NumberOfExecutos] [Bolt2]=[NumberOfExecutos]
The rebalance command will first deactivate ...
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