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From "Kanak Biscuitwala (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HELIX-128) Support multiple communication channels between controllers, participants, and spectators
Date Thu, 13 Feb 2014 07:34:19 GMT

     [ https://issues.apache.org/jira/browse/HELIX-128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kanak Biscuitwala updated HELIX-128:

    Labels: Java cluster distributed-systems gsoc gsoc2014 mentor netty  (was: Java cluster
distributed-systems gsoc2014 mentor netty)

> Support multiple communication channels between controllers, participants, and spectators
> -----------------------------------------------------------------------------------------
>                 Key: HELIX-128
>                 URL: https://issues.apache.org/jira/browse/HELIX-128
>             Project: Apache Helix
>          Issue Type: Improvement
>            Reporter: Kanak Biscuitwala
>              Labels: Java, cluster, distributed-systems, gsoc, gsoc2014, mentor, netty
> It's clearly important for members of a cluster to communicate with one another.
> Currently all communications between controller, participant, and spectator happens via
zookeeper. This is important for systems where fault tolerance cannot be compromised and consensus
is necessary. But this also increases the latency of communication quite a bit. 
> For some applications, it is important that communication between different components
is fast, it's ok to lose messages in some cases or if controller fails after the message is
sent. we can either use tcp or any other pub/sub mechanism to make this as faster.
> Furthermore, members of the cluster may want to transfer larger amounts of data while
still routing based on current Helix assignments. One way to do this is to wrap the current
messaging API, but use a different underlying framework. Netty provides an efficient framework
for intra-cluster communication and may be a good fit here.
> The big thing is that we don't want ZooKeeper to turn into a data store, nor do we want
it to be a place where there is high write traffic of any size. On top of that, not all applications
need consensus for every piece of communication. This is why we need an alternative channel.
> Programming language: Java
> Experience required: Object-oriented programming, concurrency, possibly basic networking
> Helpful knowledge: Helix API, ZooKeeper, frameworks like Netty

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