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https://issues.apache.org/jira/browse/SPARK-22255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16200732#comment-16200732
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Sean Owen commented on SPARK-22255:
-----------------------------------

You have to block here, right? I'm not clear how you wait on input if you only 
check available(). There will be points where there are 0 input bytes available 
but you don't want to stop.

> FileAppender InputStream.read() timeout and blocking state
> ----------------------------------------------------------
>
>                 Key: SPARK-22255
>                 URL: https://issues.apache.org/jira/browse/SPARK-22255
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.2.0
>            Reporter: Mariusz Galus
>            Priority: Minor
>
> The FileAppender logic when reading from InputStream blocks. This can be 
> simply avoided with a InputStream.available() check prior to reading. 
> If this is done, a variable for estimated available bytes needs to be 
> instantiated to use in the conditionals. The conditional for reading from the 
> inputstream and the conditional for appending to the file.



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