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From "Lei Xia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HELIX-599) Support creating/maintaining/routing resources with same names in different instance groups
Date Thu, 04 Jun 2015 20:55:39 GMT
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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