Storm Plugin¶
The Storm plugin for sahara provides a way to provision Apache Storm clusters on OpenStack in a single click and in an easily repeatable fashion.
Currently Storm is installed in standalone mode, with no YARN support.
Images¶
For cluster provisioning, prepared images should be used.
| Version (image tag) | Distribution | Build method | Version (build parameter) | Notes |
|---|---|---|---|---|
| 1.2 | Ubuntu 16.04 | sahara-image-create | 1.2.1, 1.2.0 | both versions are supported by the same image tag |
| 1.1.0 | Ubuntu 16.04 | sahara-image-create | 1.1.1, 1.1.0 | both versions are supported by the same image tag |
For more information about building image, refer to Sahara documentation.
The Storm plugin requires an image to be tagged in the sahara image registry with two tags: ‘storm’ and ‘<Storm version>’ (e.g. ‘1.1.0’).
The image requires a username. For more information, refer to the registering image section of the Sahara documentation.
Note that the Storm cluster is deployed using the scripts available in the Storm distribution, which allow the user to start all services (nimbus, supervisors and zookeepers), stop all services and so on. As such Storm is not deployed as a standard Ubuntu service and if the virtual machines are rebooted, Storm will not be restarted.
Storm configuration¶
Storm needs few parameters to work and has sensible defaults. If needed they can be changed when creating the sahara cluster template. No node group options are available.
Once the cluster is ready, connect with ssh to the master using the ubuntu user and the appropriate ssh key. Storm is installed in /usr/local/storm and should be completely configured and ready to start executing jobs. At the bottom of the cluster information page from the OpenStack dashboard, a link to the Storm web interface is provided.
Cluster Validation¶
When a user creates a Storm cluster using the Storm plugin, the cluster topology requested by user is verified for consistency.
Currently there are the following limitations in cluster topology for the Storm plugin:
- Cluster must contain exactly one Storm nimbus
- Cluster must contain at least one Storm supervisor
- Cluster must contain at least one Zookeeper node
The tested configuration has nimbus, supervisor, and Zookeeper processes each running on their own nodes. Another possible configuration is one node with nimbus alone, and additional nodes each with supervisor and Zookeeper processes together.
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