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https://issues.apache.org/jira/browse/SPARK-17633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513125#comment-15513125
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Sean Owen commented on SPARK-17633:
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Yeah I can reproduce that. It is weird behavior, but, it's due to the fact that
Spark/HDFS APIs generally expect that the file does not change.
I see that it does re-read the file as expected in this scenario, so it
reflects changes in the line count. Adding a line increases the count, taking
it away decreases it back to 2. Adding more than one line only adds 1 to the
count. Making a new RDD and counting again works as expected. Removing lines
after counting causes an exception because it finds the file isn't as long as
it expected.
I think this falls into the category of unsupported usage, but it is surprising
to a user that it sort of works but not quite.
> texFile() and wholeTextFiles() count difference
> -----------------------------------------------
>
> Key: SPARK-17633
> URL: https://issues.apache.org/jira/browse/SPARK-17633
> Project: Spark
> Issue Type: Bug
> Components: Input/Output
> Affects Versions: 1.6.2
> Environment: Unix/Linux
> Reporter: Anshul
>
> sc.textFile() creates an RDD of string from a text file.
> After that when count is performed, the line count is correct, but if more
> than one line is appended to the file manually and counting the same RDD of
> string increments the output/result only by 1.
> But in case of sc.wholeTextFiles() the output/result is correct.
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