Billy Liu resolved KYLIN-3271.
    Resolution: Fixed

> Optimize sub-path check of ResourceTool
> ---------------------------------------
>                 Key: KYLIN-3271
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3271
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Metadata
>    Affects Versions: v2.2.0
>            Reporter: nichunen
>            Assignee: nichunen
>            Priority: Minor
>             Fix For: v2.4.0
> kylin uses class org.apache.kylin.common.persistence.ResourceTool to do 
> metadata download, upload, remove, etc. The algorithm for resource 
> transversal is not very effective. For instance, for an "execute_output" with 
> key "/execute_output/\{uuid}", the algorithm will try to check whether it's a 
> folder with sub-resources, this makes un-necessary time cost, and in cases of 
> metadata with lots of jobs, it may last for a long time before the finish.

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