Joshua M. Boniface
8c252aeecc
The previous method was a "throw it in the sea"-type migration with some (very arbitrary) sleep statements thrown in for good measure. Reimplement this with some hard locking. During each phase of the transition, the nodes acquire read/write shared locks to a Zookeeper key so that they can tightly coordinate the actions of transferring each part of the primary state between them. This is done in a subthread to prevent strange blocking issues that were encountered, likely due to business in the existing main thread.
PVC - The Parallel Virtual Cluster suite
PVC is a suite of Python 3 tools to manage virtualized clusters. It provides a fully-functional private cloud based on four key principles:
- Be Free Software Forever (or Bust)
- Be Opinionated and Efficient and Pick The Best Software
- Be Scalable and Redundant but Not Hyperscale
- Be Simple To Use, Configure, and Maintain
It is designed to be an administrator-friendly but extremely powerful and rich modern private cloud system, but without the feature bloat and complexity of tools like OpenStack. With PVC, an administrator can provision, manage, and update a cluster of dozens or more hypervisors running thousands of VMs using a simple CLI tool, HTTP API, or [eventually] web interface. PVC is based entirely on Debian GNU/Linux and Free-and-Open-Source tools, providing the glue to bootstrap, provision and manage the cluster, then getting out of the administrators' way.
Your cloud, the best way; just add physical servers.