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root / src / Ganeti / Locking @ 1e0d1a19

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Allocation.hs 15.7 kB
Locks.hs 5.3 kB
Types.hs 1.5 kB

Latest revisions

# Date Author Comment
26436ab5 03/06/2014 05:35 pm Klaus Aehlig

Add a function to determine the lock owners

To allow for clean up, add a function that provides the list
of all the owners holding at least one lock.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
61fd6337 03/04/2014 05:03 pm Klaus Aehlig

Provide an asynchronous task for writing lock status

It will be used to persist the state of the lock allocation on
disk, allowing locks to survive reboots of WConfD.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
ec2355ad 03/04/2014 02:27 pm Klaus Aehlig

Add Ganeti Lock Hierarchy

Make Ganeti.Locking.Locks.GanetiLocks present the full Ganeti
lock hierarchy. This is in accordance with the current Python
implementation.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>...
79786c6b 03/04/2014 02:26 pm Klaus Aehlig

Serialize locks as JSON strings

...as the current Python implementation does as well.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
e1e36b88 02/27/2014 04:33 pm Klaus Aehlig

Locks are owned by job id file path pairs

...according to our updated design.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
c8751a72 02/26/2014 06:23 pm Klaus Aehlig

Add a function to load lock allocation from disk

Lock allocation are stored on disk as their JSON representation.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
15a53b1e 02/26/2014 06:23 pm Klaus Aehlig

Make Locks a JSON instance

As requests to acquire or release locks come via
inter-process communication, we need a serialization
of the locks data type.

All locks are serialised as JSON objects, where the
key "type" describes the type of lock, and the remaining...
71dc39a1 02/26/2014 06:23 pm Klaus Aehlig

Make LockAllocation an instance of JSON

In this way, we can serialize a lock state to disk, so that
locks can survive a restart of WConfD.

Signed-off-by: Klaus Aehlig <>
Reviewed-by: Petr Pudlak <>
4b217f68 02/21/2014 02:14 pm Klaus Aehlig

Support opportunistic lock allocation

Add a function to opportunistically allocate as many locks of a given
set as possible. This is equivalent to sequentially try the locks in
increasing lock order after restricting to those locks where the
required owner state is higher than the currently held one....
d8216f2d 02/21/2014 02:14 pm Klaus Aehlig

Add a convenience function to restrict locks to a given set

As it is an operation the locking daemon is supposed to provide,
add a function restricting the locks of a user to a given list
and release all other locks.

Signed-off-by: Klaus Aehlig <>...

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