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https://issues.apache.org/jira/browse/FLINK-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15532237#comment-15532237
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Stephan Ewen commented on FLINK-4709:
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Good catch. Do you want to open a pull request for that?
> InputStreamFSInputWrapper does not close wrapped stream
> -------------------------------------------------------
>
> Key: FLINK-4709
> URL: https://issues.apache.org/jira/browse/FLINK-4709
> Project: Flink
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.3, 1.1.2
> Reporter: Holger Frydrych
>
> In FileInputFormat::decorateInputStream (flink.api.common.io), if the
> inputStream gets wrapped by an InputStreamFSInputWrapper, it will never get
> closed. FileInputFormat does call close() on its stream, but the wrapper does
> not implement close() to forward this call to the wrapped stream. This leads
> to a resource leak which can eventually exhaust the maximum number of open
> file handles allowed if processing a lot of input files.
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