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https://issues.apache.org/jira/browse/FLINK-9707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16532186#comment-16532186
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ASF GitHub Bot commented on FLINK-9707:
---------------------------------------

Github user lamber-ken commented on a diff in the pull request:

    https://github.com/apache/flink/pull/6243#discussion_r199997861
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/core/fs/local/LocalFileSystem.java ---
    @@ -254,7 +254,7 @@ else if (file.exists() && !file.isDirectory()) {
                }
                else {
                        File parent = file.getParentFile();
    -                   return (parent == null || mkdirsInternal(parent)) && 
file.mkdir();
    +                   return (parent == null || mkdirsInternal(parent)) && 
(file.mkdir() || file.isDirectory());
    --- End diff --
    
    emm, why not use `synchronized` to prevent? 


> LocalFileSystem does not support concurrent directory creations
> ---------------------------------------------------------------
>
>                 Key: FLINK-9707
>                 URL: https://issues.apache.org/jira/browse/FLINK-9707
>             Project: Flink
>          Issue Type: Improvement
>          Components: FileSystem
>    Affects Versions: 1.5.0, 1.6.0
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 1.6.0, 1.5.1
>
>
> The {{LocalFileSystem}} does not support concurrent directory creations. The 
> consequence is that file system operations fail.
> I think the culprit is the following line: 
> https://github.com/apache/flink/blob/master/flink-core/src/main/java/org/apache/flink/core/fs/local/LocalFileSystem.java#L257



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