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https://issues.apache.org/jira/browse/ASTERIXDB-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abdullah Alamoudi closed ASTERIXDB-2194.
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Resolution: Fixed
> Introduce datasource functions
> ------------------------------
>
> Key: ASTERIXDB-2194
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2194
> Project: Apache AsterixDB
> Issue Type: Improvement
> Components: COMP - Compiler
> Reporter: Abdullah Alamoudi
> Assignee: Abdullah Alamoudi
> Priority: Major
>
> Sometimes, we would like to be able to query system status. For example:
> 1. Disk space.
> 2. Number of components of a dataset.
> 3. Memory usage.
> And many others. Being able to query such information and utilize the power
> of the query language and the runtime makes a great investigative/diagnostic
> tool.
> Currently, there is no easy way to do that. Such functionality can be
> achieved through:
> 1. External datasets but that takes a lot of work in terms of development and
> usage.
> 2. Use specific diagnostic end points but then that is also a lot of
> development work and you end up losing the ability to use the query language.
> Current proposal is to introduce datasource functions. A datasource function
> is different from normal functions as:
> 1. Takes constants ( as opposed to variables).
> 2. Has location constraints "For a start, it can be on all nodes".
> An example would be the function dataset_resources(String dataverse, String
> dataset);
> This function takes a dataverse and a dataset and produce a set of json
> representing the disk resources of the dataset.
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