Monasca Database Persister
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Bharat Kunwar 0daa8ebc76 Tool to migrate existing data to db per tenant 3 years ago
common Replace URLs with URLs 4 years ago
config-generator Update documentation to use new default config 4 years ago
docker Support Kafka_events option in docker evn 3 years ago
etc/monasca Turn logging down from DEBUG in persister-logging.conf 4 years ago
java Update all columns in metrics on an update to refresh TTL 3 years ago
monasca_persister Tool to migrate existing data to db per tenant 3 years ago
perf Fix the misspelling of "available" 4 years ago
playbooks Push Docker image to Docker Hub 4 years ago
releasenotes Implement separate db per tenancy 3 years ago
.coveragerc Add coverage report display 4 years ago
.gitignore Add job for releasenotes 4 years ago
.gitreview OpenDev Migration Patch 4 years ago
.stestr.conf Add .stestr.conf . 5 years ago
.testr.conf Add unit tests 6 years ago
.zuul.yaml Merge "Disable monasca-tempest-java-influxdb job" 3 years ago
LICENSE Added copyright header and LICENSE file. 9 years ago
README.rst README.rst: make it us-ascii 4 years ago
bindep.txt Add bindep.txt 6 years ago
lower-constraints.txt Use Confluent Kafka client 3 years ago
pom.xml Upper pom version to 1.3.0 5 years ago
requirements.txt Use Confluent Kafka client 3 years ago Ensure the same branch is used for common build 7 years ago
setup.cfg Exclude influxdb 5.2.3 for python 3 years ago Updated from global requirements 6 years ago
test-requirements.txt Change lower-constraints for cassandra-driver 3 years ago
tox.ini Add Python 3 Train unit tests 3 years ago


Team and repository tags



The Monitoring Persister consumes metrics and alarm state transitions from the Message Queue and stores them in the Metrics and Alarms database.

Although the Persister isn't primarily a Web service it uses DropWizard,, which provides a nice Web application framework to expose an http endpoint that provides an interface through which metrics about the Persister can be queried as well as health status.

The basic design of the Persister is to have one Kafka consumer publish to a Disruptor,, that has output processors. The output processors use prepared batch statements to write to the Metrics and Alarms database.

The number of output processors/threads in the Persister can be specified to scale to more messages. To horizontally scale and provide fault-tolerance any number of Persisters can be started as consumers from the Message Queue.


Requires monasca-common from Download and build following instructions in its Then build monasca-persister by:

mvn clean package


A sample configuration file is available in java/src/deb/etc/persister-config.yml-sample.

A second configuration file is provided in java/src/main/resources/persister-config.yml for use with the vagrant "mini-mon" development environment.


  • Purge metrics on shutdown
  • Add more robust offset management in Kafka. Currently, the offset is advanced as each message is read. If the Persister stops after the metric has been read and prior to it being committed to the Metrics and Alarms database, the metric will be lost.
  • Add better handling of SQL exceptions.
  • Complete health check.
  • Specify and document the names of the metrics that are available for monitoring of the Persister.
  • Document the yaml configuration parameters.


Copyright (c) 2014 Hewlett-Packard Development Company, L.P.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.


To install the Python monasca-persister modules, git clone the source and run the following command:

$ sudo python install

To run the unit tests use:

$ tox -e py27,py35