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---
features:
- |
The ``ironic-conductor`` process now has a concept of an internal
memory limit. The intent of this is to prevent the conductor from running
the host out of memory when a large number of deployments have been
requested.
These settings can be tuned using
``[DEFAULT]minimum_required_memory``,
``[DEFAULT]mimimum_memory_wait_time``,
``[DEFAULT]minimum_memory_wait_retries``, and
``[DEFAULT]minimum_memory_warning_only``.
Where possible, Ironic will attempt to wait out the time window, thus
consuming the conductor worker thread which will resume if the memory
becomes available. This will effectively rate limit concurrency.
If raw image conversions with-in the conductor is required, and a
situation exists where insufficent memory exists and it cannot be waited,
the deployment operation will fail. For the ``iscsi`` deployment
interface, which is the other location in ironic that may consume large
amounts of memory, the conductor will wait until the next agent heartbeat.
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