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https://issues.apache.org/jira/browse/SPARK-18974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15781279#comment-15781279
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Shixiong Zhu commented on SPARK-18974:
--------------------------------------
Not sure about HDFS. But I just checked my local file system on Mac. It doesn't
change `access_time` after renaming a file, either.
{code}
$ stat -x a.txt
File: "a.txt"
Size: 2 FileType: Regular File
Mode: (0644/-rw-r--r--) ...
Device: 1,4 Inode: 437388576 Links: 1
Access: Tue Dec 27 13:10:13 2016
Modify: Tue Dec 27 13:10:13 2016
Change: Tue Dec 27 13:10:13 2016
$ sleep 3
$ mv a.txt b.txt
$ stat -x b.txt
File: "b.txt"
Size: 2 FileType: Regular File
Mode: (0644/-rw-r--r--) ...
Device: 1,4 Inode: 437388576 Links: 1
Access: Tue Dec 27 13:10:13 2016
Modify: Tue Dec 27 13:10:13 2016
Change: Tue Dec 27 13:10:13 2016
{code}
> FileInputDStream could not detected files which moved to the directory
> -----------------------------------------------------------------------
>
> Key: SPARK-18974
> URL: https://issues.apache.org/jira/browse/SPARK-18974
> Project: Spark
> Issue Type: Bug
> Components: DStreams
> Affects Versions: 1.6.3, 2.0.2
> Reporter: Adam Wang
>
> FileInputDStream use mod time to find new files, but if a file was moved into
> the directories it's modification time would not be changed, so
> FileInputDStream could not detect these files.
> I think a way to fix this bug is get access_time and do judgment, bug it need
> a Set of files to save all old files, it would very inefficient for lot of
> files directory.
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