Managing Storm Topologies

Scenario

You can manage Storm topologies on the Storm web UI. Users in the storm group can manage only the topology tasks submitted by themselves, while users in the stormadmin group can manage all topology tasks.

Procedure

1. For details about how to access the Storm WebUI, see Accessing the Storm Web UI.
2. In the Topology summary area, click the desired topology.
3. Use options in Topology actions to manage the Storm topology.
   • Activating a topology

     Click Activate to activate the topology.

   • Deactivating a topology

     Click Deactivate to deactivate the topology.

   • Re-deploying a topology

     Click Rebalance and specify the wait time (in seconds) of re-deployment. Generally, if the number of nodes in a cluster changes, the topology can be re-deployed to maximize resource usage.

   • Deleting a topology

     Click Kill and specify the wait time (in seconds) of the deletion.

   • Starting or stopping sampling messages

     Click Debug. In the dialog box displayed, specify the percentage of the sampled data volume. For example, if the value is set to 10, 10% of data is sampled.

     To stop sampling, click Stop Debug.

     

     This function is available only if the sampling function is enabled when the topology is submitted. For details about querying data processing information, see Querying Storm Topology Logs.

   • Modifying the topology log level

     Click Change Log Level to specify a new log level.

4. Displaying a topology

   In the Topology Visualization area, click Show Visualization to visualize the topology.