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From "Julien Le Dem (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3572) Provide a simple interface to append metadata to files and directories (.drill)
Date Wed, 02 Dec 2015 23:52:11 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3572?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036898#comment-15036898
] 

Julien Le Dem commented on DRILL-3572:
--------------------------------------

I created separate sub-tickets for several aspects of the dotdrill file.
Each one of them can be implemented independently assuming they are separate fields in a {{.drill}}
file:
{noformat}
{
   version: ...
   format: {
     ...
   },
  schema: {
   ...
   },
   error_handling: {
   ...
   }
}
{noformat}
  

> Provide a simple interface to append metadata to files and directories (.drill)
> -------------------------------------------------------------------------------
>
>                 Key: DRILL-3572
>                 URL: https://issues.apache.org/jira/browse/DRILL-3572
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Storage - Other
>            Reporter: Jacques Nadeau
>             Fix For: Future
>
>
> We need a way to store small amounts of metadata about a file or a collection of files.
 The current thinking was a way to have a "dot drill file" that ascribes metadata to a particular
asset. 
> Initial example file might be something that includes the following:
> {code}
> {
>   // Drill version identifier
>   version: "dd1"  
>   
>   // Format Plugin Configuration
>   format: {  
>     type: "httpd", 
>     format: "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" \"%{Cookie}i\""}
>   },
>   
>   // Traits of underlying data (a.k.a physical properties)
>   traits: [ // traits of the underlying data
>     {type: "sort_nulls_first", columns: ["request.uri", "client.host"]}
>     {type: "unique", columns ["abc"]}
>     {type: "unqiue", columns ["xy", "zz"]}
>   ],
>   
>   // Mappings between directory names and exposed columns
>   dirs: [
>     {skip: true}, // don't include this directory name in the directory path.
>     {name: "year", type: "integer"},
>     {name: "month", type: "integer"},
>     {name: "day", type: "integer"}
>   ],
>   // whether or not a user can add new columns to the table through insert
>   rigid_table: true
>   
> }
> {code}
> We also need to support adding more machine-generated/managed data such as statistics.
 That should be done using a separate file from the one that is human description.
> A user should be able to ascribe this metadata directly through the file system as well
as through sql commands such as 
> {code}
> ALTER TABLE ADD METADATA ...
> {code}



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