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From Zhen Zhang <nehzgn...@gmail.com>
Subject Re: request for c++ api
Date Fri, 25 Mar 2016 17:42:21 GMT
Hi Neutron, follow up on the HelixAgent idea. I think we can define two

You c/c++ service will implement an endpoint which accepts PING and returns
OK. This is basically used for monitoring the liveness of your c/c++

You c/c++ service will implement another endpoint which accepts
STATE_TRANSITION(resource, partition, from_state, end_state), executes the
actual state transition in your service, and returns OK or ERROR depending
on the execution results. Note that state transitions are parallel, so you
endpoint should be async. Actual parallelism can be configured.

For the actual implementation, you can use tcp endpoint (eg.
tcp://localhost:123456), or a restful endpoint (eg. http://localhost/ping
for ping, and
for state transition)

On the other hand, a java base HelixAgent will join the cluster as a
participant. It keeps monitoring your service using the PING endpoint, and
proxy the state transitions using the STATE_TRANSITION endpoint. Both
endpoints can be configured on HelixAgent and we can provide a couple of
default implementations like tcp or http.

This idea should be straightforward to implement. Let us know if this works
for you.


On Mon, Mar 21, 2016 at 8:22 PM, Greg Brandt <brandt.greg@gmail.com> wrote:

> Hey Neutron, have you considered Helix Agent?
> http://helix.apache.org/0.7.1-docs/tutorial_agent.html
> -Greg
> On Mon, Mar 21, 2016 at 4:10 PM, Neutron sharc <neutronsharc@gmail.com>
> wrote:
>> Hi Helix team,
>> Our distributed storage system consists of a storage pool partitioned
>> into many shards. Each shard has a master and several slave replicas
>> and we run replication to keep them synchronized.  We need a way to do
>> automatic failover,  and resource rebalance. It seems helix can meet
>> our needs. However our system is written in pure c/c++. Can you guys
>> provide c++ api for participant and spectator so we can integrate
>> helix into our system?  Thanks a lot!
>> -neutron

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