Any specific reasons for going with Kafka? What is the advantage of using Kafka
over RabbitMQ?
Thanks
Naga
> On Dec 2, 2015, at 6:09 AM, Samikshan Bairagya <@redhat.com> wrote:
>
> Hi,
>
> The updates for the eventing framework for gluster can be divided into the
> following two parts.
>
> 1. Bubbling out notifications through dbus signals from every gluster node.
>
> * The 'glusterfs' module in storaged [1] exports objects on the system bus
> for every gluster volume. These objects hold the following properties:
> - Name
> - Id
> - Status (0 = Created, 1 = Started, 2 = Stopped)
> - Brickcount
>
> * A singleton dbus object corresponding to glusterd is also exported by
> storaged on the system bus. This object holds properties to track the state
> of glusterd (LoadState and ActiveState).
>
> 2. Aggregating all these signals from each node over an entire cluster.
>
> * Using Kafka [2] for messaging over a cluster: Implementing a (dbus signal)
> listener in python that converts these dbus signals from objects to 'keyed
> messages' in Kafka under a particular 'topic'.
>
> For example, if a volume 'testvol' is started, a message is published under
> topic 'testvol', with 'status' as the 'key' and the changed status ('1' in
> this case) as the 'value'.
>
>
> *** Near term plans:
> - Export dbus objects corresponding to bricks.
> - Figure out how to map the path to the brick directory to the block device
> and consequently the drive object. The 'SmartFailing' property from
> org.storaged.Storaged.Drive.Ata [3] interface can then be used to track brick
> failures.
> - Make the framework work over a multi-node cluster with possibly a
> multi-broker kafka setup to identify redundancies as well as to keep
> consistent information across the cluster.
>
> Views/feedback/queries are welcome.
>
> [1] https://github.com/samikshan/storaged/tree/glusterfs
> [2] http://kafka.apache.org/documentation.html#introduction
> [3]
> http://storaged-project.github.io/doc/latest/gdbus-org.storaged.Storaged.Drive.Ata.html#gdbus-property-org-storaged-Storaged-Drive-Ata.SmartFailing
>
> Thanks and Regards,
>
> Samikshan
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>
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