Current File : //lib/python2.7/site-packages/salt/states/zk_concurrency.pyc
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Control concurrency of steps within state execution using zookeeper
===================================================================
:depends: kazoo
:configuration: See :py:mod:`salt.modules.zookeeper` for setup instructions.
This module allows you to "wrap" a state's execution with concurrency control.
This is useful to protect against all hosts executing highstate simultaneously
if your services don't all HUP restart. The common way of protecting against this
is to run in batch mode, but that doesn't protect from another person running
the same batch command (and thereby having 2x the number of nodes deploying at once).
This module will bock while acquiring a slot, meaning that however the command gets
called it will coordinate with zookeeper to ensure that no more than max_concurrency
steps are executing with a single path.
.. code-block:: yaml
acquire_lock:
zk_concurrency.lock:
- name: /trafficeserver
- zk_hosts: 'zookeeper:2181'
- max_concurrency: 4
- prereq:
- service: trafficserver
trafficserver:
service.running:
- watch:
- file: /etc/trafficserver/records.config
/etc/trafficserver/records.config:
file.managed:
- source: salt://records.config
release_lock:
zk_concurrency.unlock:
- name: /trafficserver
- require:
- service: trafficserver
This example would allow the file state to change, but would limit the
concurrency of the trafficserver service restart to 4.
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Block state execution until you are able to get the lock (or hit the timeout)
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Remove lease from semaphore.
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Ensure that there are `min_nodes` in the party at `name`, optionally blocking if not available.
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