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From Erwin Karbasi <er...@optinity.com>
Subject Re: Leader election - Distributed lock manager
Date Sun, 12 May 2013 17:27:10 GMT
Hi Kishroe,

Thank for the information.
I'll deep dive into the code that you sent tomorrow.
Is that code will ensure that I have one cluster that i can send to it
requests and one member from that cluster (leader) will grab the request
and treat it.

Thanks again,
Erwin Karbasi
AT&T, Senior Software Architect


On Sun, May 12, 2013 at 7:57 PM, kishore g <g.kishore@gmail.com> wrote:

> Hi Erwin,
>
> Thanks for looking into Helix. In Helix, most of the time the only
> configuration needed is the zookeeper address and cluster name. This is the
> code you can use to contact a server.
>
> //in the server A code at start up
> final RoutingTableProvider routingTable = new RoutingTableProvider();
> //Default Externalview implementation
> manager = HelixManagerFactory.getZKHelixManager(clusterName, instanceName,
> InstanceType.SPECTATOR, zkConnectString)
> manager.connect();
> manager.addExternalViewChangeListener(routingTable)
>
>
>
> //Any time you want to talk to servers B
> //you can get a instances for a specific resource, partition in specific state. e.g getInstances("LockGroup",
"lockGroup_0", "LEADER");
>
> List<InstanceConfig> instances = getInstances(String resourceName, String partitionName,
String state)
>
>
> //Get all instances in given resource in a specific state e.g getInstances("LockGroup",
"LEADER");
> Set<InstanceConfig> instances = getInstances(String resource, String state)
>
>
>
> InstanceConfig can give you all details about the server like host, port
> or anything else you want to add.
>
> Hope this helps. Thanks for bringing this up, we need to add an example
> code for this.
>
> Thanks,
> Kishore G
>
> On Sun, May 12, 2013 at 9:00 AM, Erwin Karbasi <erwin@optinity.com> wrote:
>
>>
>>  Hello Masters,
>>
>> We'd like to use Helix for Leader Election mechanism.
>> Following our scenario:
>>
>> We have one server (server A) that need to connect to group of other
>> servers (server B).
>> How server A can access the server B's group - cluster.
>>
>> As I know from other cluster frameworks, we can concatenate multiple
>> server ip:port and the cluster will pass the requests to the leader process
>> that in the cluster.
>>
>> How above scenario could be implemented by using Helix leader election
>> (Distributed lock manage) as demonstrated here:
>> http://helix.incubator.apache.org/recipes/lock_manager.html
>>
>> Your insight would be highly appreciated.
>>
>> Thanks,
>> Erwin Karbasi <ek128b@att.com>
>> AT&T, Senior Software Architect
>>
>>
>

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