Github user ryan-williams commented on a diff in the pull request: https://github.com/apache/spark/pull/2848#discussion_r21386945 --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala --- @@ -412,6 +403,48 @@ private[spark] object Utils extends Logging { } /** + * Download a file from @in to @tempFile, then move it to @destFile, checking whether @destFile + * already exists, is equal to the downloaded file, and can be overwritten. + */ + private def maybeMoveFile( + url: String, + sourceFile: File, + destFile: File, + fileOverwrite: Boolean): Unit = { + + var shouldCopy = true + if (destFile.exists) { + if (!Files.equal(sourceFile, destFile)) { + if (fileOverwrite) { + destFile.delete() + logInfo(("File %s exists and does not match contents of %s, " + + "replacing it with %s").format(destFile, url, url)) + } else { + throw new SparkException( + "File " + destFile + " exists and does not match contents of" + " " + url) + } + } else { + // Do nothing if the file contents are the same, i.e. this file has been copied + // previously. + logInfo(sourceFile.getAbsolutePath + " has been previously copied to " --- End diff -- done, though it went to 101 chars and I had to wrap it, which is not the clearest, but whatevs.
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