How to monitor and debug a Storm topology.

To monitor and debug Storm topologies, you can utilize the following tools and methods:

1. Storm UI: Storm provides a web interface to monitor the operational status, task allocation, throughput, and other information of topologies.
2. Log Files: Storm will record the log information of each component, by checking the log files, you can understand the running status of the topology and identify any potential issues.
3. Monitoring Metrics: You can use the Metrics library to monitor metrics such as throughput and latency of the topology, and configure alert mechanisms.
4. Debug mode: Storm provides a debug mode that allows you to run and debug topologies locally to quickly identify issues.
5. With the tools provided by Storm, such as storm list and storm kill, users can manage the running status of topologies.
6. Third-party monitoring tools can be utilized, such as Ganglia or Prometheus, to monitor the performance and operation status of Storm topologies.