Hi Reka,
We also need an extra parameter for group deployment policies which defines if
“children” (or group member) should be collocated (or not), please see in the
grouping specification “these Children must be physically next to each other”,
not sure how this will expressed in the application deployment policy. I would
suggest a boolean expression as shown below, WDYT ?
…
+ childPolicies[1..n]
+ childId (Group alias or cartridge alias)
+ collocate //
+ networkPartition[1..n]
+ id
+ partition[1..n]
+ id
+ max
Thanks
Martin
From: Reka Thirunavukkarasu [mailto:r...@wso2.com]
Sent: Saturday, November 29, 2014 8:53 PM
To: dev
Subject: Global Deployment Policy for the Application
Hi all,
In grouping, as we are supporting deployment Policy in the group level or in
the cluster level, it would be easy if we have a single place to define all the
deployment policy of children. The advantages of defining global deployment
policy as below:
- Same application can be deployed in HA or in burst manner using different
deployment Policy.
* will be starting actual VMs after deploying the deployment Policy
rather than starting it, once the application got deployed.
* deployment Policy will be coupled with an application always.
- No need to define multiple deployment policy per cluster level or group level
- Validation can also happen in the single place
* Each children's policy can be validated against the applicationPolicy
whether relevant partition/Network partition is already defined or not
* Each leave cluster should have a deployment policy either inherit from
one of the parent group or define it by its own.
- Partition can also be defined in the Deployment Policy itself
Please find the proposed format for the deployment Policy for application as
following:
+ id
+ applicationPolicy[1..1]
+ appId
+ networkPartition[1..n]
+ id
+ activeByDefault
+ partition[1..n]
+ id
+ provider
+ properties[1..n]
+ childPolicies[1..n]
+ childId (Group alias or cartridge alias)
+ networkPartition[1..n]
+ id
+ partition[1..n]
+ id
+ max
Please find the definition of new elements in the Deployment Policy as below:
applicationPolicy : will have definition of all the network partition and
partition which will be used throughout the application.
activeByDefault : If true means, that network partition will be used by
default. If false, means it can be used when all the resources are exhausted(in
bursting)
childPolicies : Each child policy will refer the network partition and relevant
partition from applicationPolicy to define their own deployment pattern. Please
note that, if you define a childPolicy by referring to group, then underlying
clusters/group will inherit the same policy.
max: Maximum no of instances that can be handled by a partition.
For group: max group instances can be in a partition
For Cluster: max members that can be kept for a cluster instance in a
partition.
FYI: A sample Policy is attached here with.
Please share your suggestions on this...
Thanks,
Reka
--
Reka Thirunavukkarasu
Senior Software Engineer,
WSO2, Inc.:http://wso2.com,
Mobile: +94776442007<tel:%2B94776442007>
