Github user steveloughran commented on the issue: https://github.com/apache/spark/pull/14731 Actually, I've just noticed that DStream behaviour isn't in sync with the streaming programming guide, which says "files written in nested directories not supported)". That is: SPARK-14796 didn't patch the docs. it may as well be fixed in this patch. How about, in the bullet points underneath - Wildcards may be used to specify a set of directories to scan for new files, for example `hdfs://nn1:8050/users/alice/logs/2016-*/*.gz` - -New directories and their contents will be discovered as they arrive Special points for object stores - Wildcard lookup may be very slow with some object stores. - Directory rename is not atomic; if a directory is renamed into the streaming source, then the files within may only be discovered and process across a multiple streaming windows. - + there's another optimisation; use the {{SparkHadoopUtils.isGlobPath()}} predicate to recognise when the dir path isn't a wildcard, in which case just do a simple listFiles()}}. Until that shortcutting is done automatically in the Hadoop FS implementation, spark can do it on its side. As the {{listFiles()}} call was what was used before SPARK-14796, it has to be compatible, else SPARK-14796 has broken things
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