Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14731#discussion_r77314137
--- Diff: docs/streaming-programming-guide.md ---
@@ -644,13 +644,44 @@ methods for creating DStreams from files as input
sources.
</div>
</div>
- Spark Streaming will monitor the directory `dataDirectory` and process
any files created in that directory (files written in nested directories not
supported). Note that
-
- + The files must have the same data format.
- + The files must be created in the `dataDirectory` by atomically
*moving* or *renaming* them into
- the data directory.
- + Once moved, the files must not be changed. So if the files are
being continuously appended, the new data will not be read.
-
+ Spark Streaming will monitor the directory `dataDirectory` and process
any files created in that directory.
+
+ + A simple directory can be supplied, such as
`hdfs://namenode:8040/logs/`.
+ All files directly such a path will be processed as they are
discovered.
+ + A regular expression can be supplied instead, such as
--- End diff --
Also if I read the code correctly, it always treats the input as a glob. If
so I think that's how it should be documented. That is, if you give it a path
to a file containing "?" it's not going to do what you think. The glob isn't
optional if I read it right.
But yeah this looks good to me code-wise.
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