salt.modules.zk_concurrency
Concurrency controls in zookeeper
This module allows you to acquire and release a slot. This is primarily useful for ensureing that no more than N hosts take a specific action at once. This can also be used to coordinate between masters.
salt.modules.zk_concurrency.lock(path, zk_hosts=None, identifier=None, max_concurrency=1, timeout=None, ephemeral_lease=False, force=False, profile=None, scheme=None, username=None, password=None, default_acl=None)
-
Get lock (with optional timeout)
- path
- The path in zookeeper where the lock is
- zk_hosts
- zookeeper connect string
- identifier
- Name to identify this minion, if unspecified defaults to the hostname
- max_concurrency
- Maximum number of lock holders
- timeout
- timeout to wait for the lock. A None timeout will block forever
- ephemeral_lease
- Whether the locks in zookeper should be ephemeral
- force
- Forcibly acquire the lock regardless of available slots
Example:
salt.modules.zk_concurrency.lock_holders(path, zk_hosts=None, identifier=None, max_concurrency=1, timeout=None, ephemeral_lease=False, profile=None, scheme=None, username=None, password=None, default_acl=None)
-
Return an un-ordered list of lock holders
- path
- The path in zookeeper where the lock is
- zk_hosts
- zookeeper connect string
- identifier
- Name to identify this minion, if unspecified defaults to hostname
- max_concurrency
- Maximum number of lock holders
- timeout
- timeout to wait for the lock. A None timeout will block forever
- ephemeral_lease
- Whether the locks in zookeper should be ephemeral
Example:
salt.modules.zk_concurrency.party_members(path, zk_hosts=None, min_nodes=1, blocking=False, profile=None, scheme=None, username=None, password=None, default_acl=None)
-
Get the List of identifiers in a particular party, optionally waiting for the specified minimum number of nodes (min_nodes) to appear
- path
- The path in zookeeper where the lock is
- zk_hosts
- zookeeper connect string
- min_nodes
- The minimum number of nodes expected to be present in the party
- blocking
- The boolean indicating if we need to block until min_nodes are available
Example:
salt.modules.zk_concurrency.unlock(path, zk_hosts=None, identifier=None, max_concurrency=1, ephemeral_lease=False, scheme=None, profile=None, username=None, password=None, default_acl=None)
-
Remove lease from semaphore
- path
- The path in zookeeper where the lock is
- zk_hosts
- zookeeper connect string
- identifier
- Name to identify this minion, if unspecified defaults to hostname
- max_concurrency
- Maximum number of lock holders
- timeout
- timeout to wait for the lock. A None timeout will block forever
- ephemeral_lease
- Whether the locks in zookeper should be ephemeral
Example: