1b24bfbd73
This adds a new scheduler driver, CachingScheduler It currently subclasses the filter scheduler and only adds caching of calls to host_manager.get_all_host_states. It relies on there being a small number of schedulers, ideally one, calls to consume_from_instance within the filter scheduler to update the current cached list of hosts, and a low rate of deletes. It introduces the new config value: scheduler_driver_task_period The periodic task it controls is used by the caching scheduler to fetch an updated copy of host_manager.get_all_host_states. If your value for service_down_time is much smaller than scheduler_driver_task_period, there will be issues with hosts appearing to be dead, just because the list of hosts is being cached. Correct configuration of those two values can avoid this issue. DocImpact Part of blueprint caching-scheduler Change-Id: I2eb873ce8024a576e597205e2d52b5d5e8aee97a
OpenStack Nova README
OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of virtualization technologies, including KVM, Xen, LXC, VMware, and more. In addition to its native API, it includes compatibility with the commonly encountered Amazon EC2 and S3 APIs.
OpenStack Nova is distributed under the terms of the Apache License, Version 2.0. The full terms and conditions of this license are detailed in the LICENSE file.
Nova primarily consists of a set of Python daemons, though it requires and integrates with a number of native system components for databases, messaging and virtualization capabilities.
To keep updated with new developments in the OpenStack project follow @openstack on Twitter.
To learn how to deploy OpenStack Nova, consult the documentation available online at:
For information about the different compute (hypervisor) drivers supported by Nova, read this page on the wiki:
In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:
Developers wishing to work on the OpenStack Nova project should always base their work on the latest Nova code, available from the master GIT repository at:
Developers should also join the discussion on the mailing list, at:
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests. Further developer focused documentation is available at:
For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst file.
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