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https://issues.apache.org/jira/browse/FLINK-7265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101711#comment-16101711
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ASF GitHub Bot commented on FLINK-7265:
---------------------------------------

Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4397#discussion_r129575803
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/fs/hdfs/HdfsKindTest.java 
---
    @@ -0,0 +1,59 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.runtime.fs.hdfs;
    +
    +import org.apache.flink.core.fs.FileSystem;
    +import org.apache.flink.core.fs.FileSystemKind;
    +import org.apache.flink.core.fs.Path;
    +
    +import org.junit.Test;
    +
    +import java.io.IOException;
    +
    +import static org.junit.Assert.assertEquals;
    +
    +public class HdfsKindTest {
    --- End diff --
    
    This class will need a javadoc after a rebase (for master).


> FileSystems should describe their kind and consistency level
> ------------------------------------------------------------
>
>                 Key: FLINK-7265
>                 URL: https://issues.apache.org/jira/browse/FLINK-7265
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.3.1
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>             Fix For: 1.4.0, 1.3.2
>
>
> Currently, all {{FileSystem}} types look the same to Flink.
> However, certain operations should only be executed on certain kinds of file 
> systems.
> For example, it makes no sense to attempt to delete an empty parent directory 
> on S3, because there are no such thinks as directories, only hierarchical 
> naming in the keys (file names).



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