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From "Roman Shaposhnik (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (BIGTOP-635) Implement a cluster-abstraction, discovery and manipulation framework for iTest
Date Tue, 19 Jun 2012 22:52:45 GMT

     [ https://issues.apache.org/jira/browse/BIGTOP-635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Roman Shaposhnik reassigned BIGTOP-635:
---------------------------------------

    Assignee: Sujay Rau  (was: Roman Shaposhnik)

@Andrew, thanks for pointing HADOOP-8468 out. This is indeed what we have to keep an eye on.

Regarding your other comment -- I agree that it is the way to go here: make it pluggable and
start small. I'm reassigning this to Sujay who expressed his willingness to prototype. I think
the focus for him is going to be gradually building this API while re-factoring some of the
tests he's already created.
                
> Implement a cluster-abstraction, discovery and manipulation framework for iTest
> -------------------------------------------------------------------------------
>
>                 Key: BIGTOP-635
>                 URL: https://issues.apache.org/jira/browse/BIGTOP-635
>             Project: Bigtop
>          Issue Type: New Feature
>          Components: Tests
>    Affects Versions: 0.4.0
>            Reporter: Roman Shaposhnik
>            Assignee: Sujay Rau
>
> We've come to a point where our tests need to have a uniform way of interfacing with
the cluster under test. It is no longer ok to assume that the test can be executed on a particular
node (and thus have access to services running on it). It is also less than ideal for tests
to assume a particular type of interaction with the services since it tends to break in different
deployment scenarios. 
> A framework that needs to be put in place has to be capable of (regardless of where a
test using it is executed on):
>   # representing the abstract configuration of the cluster
>   # representing the abstract topology of the entire cluster (services running on a cluster,
nodes hosting the daemons, racks, etc).
>   # giving tests an ability to query this topology
>   # giving tests an ability to affect the nodes in that topology in a particular way
(refreshing configuration, restarting services, etc.)
> Of course, the ideal solution here would be to give Bigtop tests a programmatic access
to a Hadoop cluster management framework such as Cloudera's CM or Apache Ambari. 
> As with any ideal solutions I don't think it is realistic though. Hence we have to cook
something up. At this point I'm really focused on getting the API right and I'm totally fine
with an implementation of that API to be something as silly as a bunch of ssh-based scripts
or something.
> This JIRA is primarily focused on coming up with such an API. Anybody who's willing to
help is welcome to.

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