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From "Chesnay Schepler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8406) BucketingSink does not detect hadoop file systems
Date Mon, 22 Jan 2018 12:14:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334192#comment-16334192
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Chesnay Schepler commented on FLINK-8406:
-----------------------------------------

I'll try to find it, IIRC they got a permission denied error in the fallback branch.

> BucketingSink does not detect hadoop file systems
> -------------------------------------------------
>
>                 Key: FLINK-8406
>                 URL: https://issues.apache.org/jira/browse/FLINK-8406
>             Project: Flink
>          Issue Type: Bug
>          Components: FileSystem
>    Affects Versions: 1.4.0, 1.5.0
>            Reporter: Chesnay Schepler
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 1.5.0, 1.4.1
>
>
> In {{BucketingSink#createHadoopFileSystem}} one can find this piece of code:
> {code}
> final org.apache.flink.core.fs.FileSystem flinkFs =
>  	org.apache.flink.core.fs.FileSystem.get(path.toUri());
> final FileSystem hadoopFs = (flinkFs instanceof HadoopFileSystem)
> 	? ((HadoopFileSystem) flinkFs).getHadoopFileSystem()
> 	: null;
> {code}
> {{FileSystem#get()}} wraps the created {{FileSystem}} in a {{SafetyNetWrapperFileSystem}},
resulting in the instanceof check to categorically fail.
> We may want to replace the {{get()}} call with {{getUnguardedFileSystem()}}. We should
also look for other occurrences of similar instanceof checks.
> According to a thread on the mailing list this causes the BucketingSink to be unusable.



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