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[jira] [Created] (FLINK-10441) Don't log warning when creating upload directory

Ufuk Celebi created FLINK-10441:

             Summary: Don't log warning when creating upload directory
                 Key: FLINK-10441
                 URL: https://issues.apache.org/jira/browse/FLINK-10441
             Project: Flink
          Issue Type: Improvement
          Components: REST
            Reporter: Ufuk Celebi

{{RestServerEndpoint.createUploadDir(Path, Logger)}} logs a warning if the upload directory does not exist.

2018-09-26 15:32:31,732 WARN  org.apache.flink.runtime.dispatcher.DispatcherRestEndpoint    - Upload directory /var/folders/hr/cxn1_2y52qxf5nzyfq9h2scw0000gn/T/flink-web-2218b898-f245-4edf-b181-8f3bdc6014f3/flink-web-upload does not exist, or has been deleted externally. Previously uploaded files are no longer available.

I found this warning confusing as it is always logged when relying on the default configuration (via {{WebOptions}}) that picks a random directory.

Ideally, our default configurations should not result in warnings to be logged.

Therefore, I propose to log the creation of the web directory on {{INFO}} instead of the warning.

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