[GitHub] [spark] linehrr commented on a change in pull request #24548: [MINOR][SS][DOC] Added missing config `maxFileAge` in file streaming source

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linehrr commented on a change in pull request #24548: [MINOR][SS][DOC] Added missing config `maxFileAge` in file streaming source
URL: https://github.com/apache/spark/pull/24548#discussion_r282196148
 
 

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 File path: docs/structured-streaming-programming-guide.md
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 @@ -510,7 +510,7 @@ returned by `SparkSession.readStream()`. In [R](api/R/read.stream.html), with th
 #### Input Sources
 There are a few built-in sources.
 
-  - **File source** - Reads files written in a directory as a stream of data. Supported file formats are text, csv, json, orc, parquet. See the docs of the DataStreamReader interface for a more up-to-date list, and supported options for each file format. Note that the files must be atomically placed in the given directory, which in most file systems, can be achieved by file move operations.
+  - **File source** - Reads files written in a directory as a stream of data(files will be processed in the order of file's modification time, this is to mimic the time series feature from streaming nature. If `latestFirst` is set, order will be reversed). Supported file formats are text, csv, json, orc, parquet. See the docs of the DataStreamReader interface for a more up-to-date list, and supported options for each file format. Note that the files must be atomically placed in the given directory, which in most file systems, can be achieved by file move operations.
 
 Review comment:
   ok revised sentence. 

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