[jira] [Created] (FLINK-8406) BucketingSink does not detect hadoop file systems

["Chesnay Schepler (JIRA)" <ji...@apache.org>]

Chesnay Schepler created FLINK-8406:
---------------------------------------

             Summary: 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
            Priority: Blocker


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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