MagnetoDB/specs/monitoring-api

MagnetoDB monitoring api

Launchpad: monitoring-api

The API for exposing usage statistic for users, external monitoring or billing tools.

Proposed Change

1. Introduce monitoring API available on the same port as data API by path /moninoting/*
2. implement REST method for list of tables /moninoting/{tenant_id}/tables
3. table usage details /moninoting/{tenant_id}/table/{table_name}

Response: {size: 1003432; item_count: 3000}

Security Impact

• secure communication with MQ should be configured

Notifications Impact

None

Other End User Impact

TBD

Performance Impact

Now we have POC for count items in table (https://review.openstack.org/#/c/118557/) but this implementation is very expensive (we scan all our data to get one counter). So we need change concept and use Cassandra JMX to get approximate number of items and also size of CF on disk.

Deployment Impact

None

Developer Impact

None

Implementation

Current concept: at Cassandra node we run JMX-HTTP bridge agent (Jolokia). Client goes to MagnetoDB with REST-like interface (.../moninoting/{tenant_id}/table/{table_name}), MagnetoDB goes to Jolokia agent via HTTP, get JMX-metrics from Cassanra and returns them to client. If you have any suggestions about implementation - welcome to our IRC-channel at Freenode #magnetodb.

Assignee(s)

Primary assignee:

 <ominakov>

Other contributors:

 <None>

Work Items

1. Define Monitoring API on wiki.
2. Write interface for API.
3. Implement calls from MagnetoDB to Jolokia agent.

Dependencies

Oslo.Messaging

Documentation Impact

Magnetodb Schema Processor deployment should be added to corresponding doc (TBD)

References

None