Lei Xia created HELIX-599:
-----------------------------
Summary: Support creating/maintaining/routing resources with same
names in different instance groups
Key: HELIX-599
URL: https://issues.apache.org/jira/browse/HELIX-599
Project: Apache Helix
Issue Type: New Feature
Components: helix-core, helix-webapp-admin
Reporter: Lei Xia
Assignee: Lei Xia
In LinkedIn, we have a new use scenario that there will be multiple databases
sitting in the same Helix cluster with the same name, but on different instance
groups. What we need are:
1) Allow resources (databases) with the same name, these resources are on
different instance groups (with different tags).
2) Routing table (Spectator) is able to aggregate and return all instance (from
multiple instance groups) that hold the database with given name.
Our proposed solution is:
1) Add a "Resource Group" field in IdealState for the databases with the same
names from different instance groups
2) Use Instance Group Tag (or new "Resource Tag") to differentiate databases
(with same name) from different instance groups.
3) Use name mangling for Idealstate, for example, with database TestDB in
instance group "testGroup", the IdealState and ExternalView id would be
"TestDB$testGroup".
4) Change Helix Routing Table to be able to aggregate databases from the same
resource group.
Four new APIs are going to be added to RoutingTableProvider:
public class RoutingTableProvider {
/**
* returns the instances that contain the given partition in a specific state
from all resources with given resource name
*/
public List<InstanceConfig> getInstances(String resource, String partition,
String state);
/**
* returns the instances that contain the given partition in a specific state
from selected resources with given name and tags
*/
public List<InstanceConfig> getInstances(String resource, String partition,
String state, List<String> resourceTags);
/**
* returns instances that contain given resource that are in a specific state
*/
public Set<InstanceConfig> getInstances(String resource, String state);
/**
* returns instances that contain given resource with tags that are in a
specific state
*/
public Set<InstanceConfig> getInstances(String resource, String state,
List<String> groupTags);
}
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