[jira] [Commented] (FLINK-8125) Support limiting the number of open FileSystem connections

["Stefan Richter (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-8125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262343#comment-16262343 ] 

Stefan Richter commented on FLINK-8125:
---------------------------------------

Maybe we can add this monitoring to the already existing `SafetyNetWrapperFileSystem`, which already returns wrapped streams to ensure that they are closed?

> Support limiting the number of open FileSystem connections
> ----------------------------------------------------------
>
>                 Key: FLINK-8125
>                 URL: https://issues.apache.org/jira/browse/FLINK-8125
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>             Fix For: 1.5.0, 1.4.1
>
>
> We need a way to limit the number of streams that Flink FileSystems concurrently open.
> For example, for very small HDFS clusters with few RPC handlers, a large Flink job trying to build up many connections during a checkpoint causes failures due to rejected connections. 
> I propose to add a file system that can wrap another existing file system The file system may track the progress of streams and close streams that have been inactive for too long, to avoid locked streams of taking up the complete pool.



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