[GitHub] spark pull request: [SPARK-2713] Executors of same application in ...

[JoshRosen <gi...@git.apache.org>]

Github user JoshRosen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1616#discussion_r17083547
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -317,13 +317,58 @@ private[spark] object Utils extends Logging {
       }
     
       /**
    +   * Copy cached file to targetDir, if not exists, download it from url firstly.
    --- End diff --
    
    Minor nitpick on naming, but I think it's confusing to have a method named `fetchCachedFile` with an option that has to be explicitly set in order to use the cache.  I'd prefer to name this `fetchFile`, and rename the other method to something like `doFetchFile` or `_fetchFile`.
    
    When fixing the merge conflict, do you mind moving the comment from the old `fetchFile` to here?  I think the most comprehensive documentation should be on the public function, not the private one.  I'd say something like
    
    ```scala
    /**
        * Download a file requested by the executor . Supports fetching the file in a variety of ways,
        * including HTTP, HDFS and files on a standard filesystem, based on the URL parameter.
        *
        * If `useCache` is true, first attempts to fetch the file from a local cache that's shared across
        * executors running the same application.
        *
        * Throws SparkException if the target file already exists and has different contents than
        * the requested file.
        */
    ```


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