[wildfly-dev] Map / reduce for management operations

[Stan Silvert]

Taken to its logical conclusion, this would become a full-fledged query 
language.

You could just create a client-side library for it and use that as the 
"language" develops.  I think that would be a safe thing to do before 
committing it as part of the supported server side interface.

  How much of a problem would this be if it were not for GWT's 
callback-hell?  It's my understanding that GWT is fixing that?

On 10/31/2014 11:35 AM, Harald Pehl wrote:
> TL;DR
>
> For management clients it is tedious and awkward to read resources / 
> attributes in big domains (e.g. return the state of all running 
> servers across all hosts which are part of server group "foo"). Today 
> this requires to setup multiple composite operations *on the 
> client* which need to be executed in a specific order. This proposal 
> suggests a new operation which collects all relevant information *on 
> the server* and returns only the relevant data in one go to the client.
>
> --------------------
>
> # Background:
>
> In the admin console we often need to read specific attributes across 
> a domain or across a deeply nested resource:
>
> - List all enabled data sources of the current profile
> - Show the port offset of all running servers across all hosts
> - Get all users which belong to role Operator
>
> Even for small domains with two server groups and a small number of 
> servers this procedure is awkward and error prone. What makes it even 
> more difficult is the asynchronous nature of the admin console. Soon 
> you end up in a deeply nested callback-hell. Besides that these 
> 'queries' lead to poor performance for big domains with tens of 
> groups, hosts and servers.
>
> # Proposal / Prototype
>
> The GitHub repository at [1] contains a more detailed description of 
> the problem statement and a working prototype. This includes details 
> such as how to address the requested resources, how the information is 
> retrieved and how to handle errors.
>
> The proposal also includes a way to filter and reduce the resources 
> against a list of attributes and values *before* the response is sent 
> to the client.
>
> [1] https://github.com/hpehl/map-reduce
>
> ---
> Harald Pehl
> JBoss by Red Hat
> http://hpehl.info
>
>
>
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