Github user ryan-williams commented on a diff in the pull request:
https://github.com/apache/spark/pull/2848#discussion_r21389032
--- 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))
--- End diff --
on reading it again, I think the original code (that predates me) made
sense: it asserting that the file exists and does not match `url`, therefore we
are replacing the thing that already exists with what is at `url`, because that
is what we want it to match.
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