Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10392#discussion_r48101284
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -2072,14 +2072,15 @@ class SparkContext(config: SparkConf) extends
Logging with ExecutorAllocationCli
// Otherwise, the driver may attempt to reconstruct the checkpointed
RDD from
// its own local file system, which is incorrect because the
checkpoint files
// are actually on the executor machines.
- if (!isLocal && Utils.nonLocalPaths(directory).isEmpty) {
+ val path = new Path(directory, UUID.randomUUID().toString)
+ val fs = path.getFileSystem(hadoopConfiguration)
+ val isDirLocal = fs.isInstanceOf[LocalFileSystem]
+ if (!isLocal && Utils.nonLocalPaths(directory).isEmpty && !isDirLocal)
{
--- End diff --
Wait, you're checking here whether the directory is _not_ local here -- the
warning happens when it is local right? Checking `LocalFileSystem` is a little
bit brittle too.
I think the right answer here is to disambiguate the checkpoint dir with an
`hdfs:` scheme. This avoids ambiguity too. If it's just to otherwise save a
warning, I don't think this is worth it. At best, clarify the warning message.
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