+1 to 1 and 2
I hope this can make cellar act in a more predictable manner.
I think 3-4 are more informative for us. Anyway they also sound good.
Christian
On 11.11.2014 14:41, Jean-Baptiste Onofré wrote:
Hi all,
Currently, we see some annoying side effects when using Cellar (with
its default configuration), especially some bundles stopped whereas
they should not, and sync issue when new nodes join.
I would like to propose the following change in the Cellar behaviour:
1/ Currently, Cellar use "listeners" that get the local node changes
(like installation of a bundle, a feature, etc), and broadcast the
changes to the entire cluster. The problem with that is that it sync
"bad" events (like bundles stop when you stop the node for instance).
I would like to disable the listeners by default, and "force" the
users to use the cluster:* dedicated commands to update the cluster
state.
Of course, the user can use a flag to enable the listeners, but at his
own risk ;)
2/ When a new node joins the cluster, Cellar uses a synchronizer (per
resource, one for features, one for bundles, etc) to "merge" the local
node state and the cluster state (it's push/pull for the state). But,
actually, this "merge" doesn't really make sense for joining node. I
think the first node of the cluster should push his state to the
cluster, but the new joining nodes state should be overwritten by the
cluster (the cluster should be the master). I propose to introduce a
configuration flag defining who is the master (cluster or node): if
it's the cluster, the synchronizer overwrites the local node state
with the cluster state, if it's the node, the synchronizer overwrite
the cluster state with the local node state.
3/ I added new HTTP support in Cellar, allowing to sync the HTTP
session and load balance the request on the different nodes of the
cluster. I will blog about this to explain how it works.
4/ I added also some new centralized feature in Cellar (like central
log view, etc). I will blog about this as well.
I already created the Jira about that.
My question is more about the Cellar 2.3.4 and 3.0.1 releases. I think
it makes sense to include those changes asap so that's why I would
like to push (of course documenting and announcing the changes) in the
next Cellar minor releases.
WDYT ?
Thanks
Regards
JB
--
Christian Schneider
http://www.liquid-reality.de
Open Source Architect
http://www.talend.com
