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Apache Storm is fault-tolerant: when workers die, Apache Storm will automatically restart them. If a node dies, the worker will be restarted on another node.

The Apache Storm daemons, Nimbus and the Supervisors, are designed to be stateless and fail-fast. So if they die, they will restart like nothing happened. This means you can kill -9 the Apache Storm daemons without affecting the health of the cluster or your topologies.

Read more about Apache Storm's fault-tolerance on the manual.