A specification for this change was submitted for review in
https://review.openstack.org/#/c/151279
- HP Vertica Community Edition supports upto a 3-node cluster.
- HP Vertica requires a minimum of 3 nodes to achieve fault tolerance.
- This patchset provides ability to launch HP Vertica 3-node cluster.
- The cluster-show API, would also list the IPs of underlying instances.
Code Added:
- Added API strategy, taskmanager strategy, and guestagent strategy.
- Included unit tests.
Workflow for building Vertica cluster is as follows:
- Guest instances are booted using new API strategy which then
sends control to taskmanager strategy for further communication
and guestagent API execution.
- Once the guest instances are active in nova,
they receive "prepare" message and following steps are performed:
- Mount the data disk on device_path.
- Check if vertica packages have been installed, install_if_needed().
- Run Vertica pre-install test, prepare_for_install_vertica().
- Get to a status BUILD_PENDING.
- Cluster-Taskmanager strategy waits for all the instances
in cluster to get to BUILD_PENDING state.
- Once all instances in a cluster get to BUILD_PENDING state,
taskmanager first, configures passwordless ssh for os-users(root, dbadmin)
with the help of guestagent APIs get_keys and authroize_keys.
- Once passwordless ssh has been configured, the taskmanager calls
install_cluster guestagent API, which installs cluster on
member instances and creates a database on the cluster.
- Once this method finishes its job then taskmanager calls
another guestagent API cluster_complete to
notify cluster member of completion of cluster creation.
New Files:
- A new directory, vertica, has been created, for api, taskmanager,
guestagent strategies under
trove/common/strategies/cluster/experimental.
- Unit-tests for cluster-controller, api and taskmanager code.
DocImpact
Change-Id: Ide30d1d2a136c7e638532a115db5ff5ab2a75e72
Implements: blueprint implement-vertica-cluster
c61a3bf5f9