Event Persistor

Event Persistor

https://blueprints.launchpad.net/vitrage/+spec/event-persistor

The presistor service listens to the RabbitMQ2 (on a different topic) and asynchronously writes the events to a relational database. All events are stored after the filter/enrich phase.

Problem description

In order to support some of the main future use cases of Vitrage, including full HA support, alarm history and RCA history, we will need to store the events that arrive from the collector in a persistent database. Explained in Vitrage HA and History Vision.

Example of a use case for the stored data: Reconstructing the graph from the historic data that controlled by the processor, and will be used in two cases:

  • Upon failure, in order to initiate the standby vitrage-graph process

  • For RCA history

Proposed change

Add event table in Vitrage database. Both Datasource driver and Service listener (collector) passes the filtered/enriched events to the persistor via vitrage_persistor topic. Add a Persistor service which listens to vitrage_persistor topic and writes the events to event table.

Alternatives

None

Data model impact

The table will have the following fields:

Field

Description

Examples

id

INTEGER, Auto-Increment

19588

collector_timestamp

The time the event filtered/enriched in the driver

2017-10-09 09:19:50

payload

The enriched event sent from the collector

JSON representation of the event

REST API impact

None

Versioning impact

None

Other end user impact

None

Deployer impact

None

Developer impact

None

Horizon impact

None

Implementation

Assignee(s)

Primary assignee:

7mode3294

Other contributors:

None

Work Items

  • Add new topic vitrage_persistor in rabbitMQ2 for the Persistor.

  • Add event table in Vitrage database.

  • Both Datasource driver and Service listener (collector) passes the filtered/enriched events to the persistor via vitrage_persistor topic.

  • Add a Persistor service which listens to vitrage_persistor topic and writes the events to event table.

Dependencies

None

Testing

The implementation will be covered by additional unit tests and tempest tests.

Documentation Impact

None

Creative Commons Attribution 3.0 License

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vitrage-specs