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https://issues.apache.org/jira/browse/SPARK-19524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15858910#comment-15858910
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Egor Pahomov commented on SPARK-19524:
--------------------------------------
[~srowen], based on documentation, which says "newFilesOnly - Should process
only new files and ignore existing files in the directory", I expect, that
files which are already exist in folder to which I connect streaming, would be
processed. It's not true. In reality files, which were created after time X
would be procesed. Time X:
{code}
private val durationToRemember = slideDuration * numBatchesToRemember
val modTimeIgnoreThreshold = math.max(
initialModTimeIgnoreThreshold, // initial threshold based on
newFilesOnly setting
currentTime - durationToRemember.milliseconds // trailing end of the
remember window
)
{code}
First, this code contradicts with documentation as far as I understand it.
Second, this code contradicts with the name "newFilesOnly" itself. There is
probably motivation behind this code, but I think the only way to find this
motivation - git history and go over all tickets.
Sorry, that I wasn't more specific first time.
> newFilesOnly does not work according to docs.
> ----------------------------------------------
>
> Key: SPARK-19524
> URL: https://issues.apache.org/jira/browse/SPARK-19524
> Project: Spark
> Issue Type: Bug
> Components: DStreams
> Affects Versions: 2.0.2
> Reporter: Egor Pahomov
>
> Docs says:
> newFilesOnly
> Should process only new files and ignore existing files in the directory
> It's not working.
> http://stackoverflow.com/questions/29852249/how-spark-streaming-identifies-new-files
> says, that it shouldn't work as expected.
> https://github.com/apache/spark/blob/master/streaming/src/main/scala/org/apache/spark/streaming/dstream/FileInputDStream.scala
> not clear at all in terms, what code tries to do
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