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https://issues.apache.org/jira/browse/HDFS-15444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167506#comment-17167506
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Uma Maheswara Rao G commented on HDFS-15444:
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[~jianghuazhu], thanks you for the question.
It's already covered in mkdirs of ViewFileSystem specific [implementation |
https://github.com/apache/hadoop/blob/5d8600e80ad7864b332b60d5a01585fdf00848ee/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java#L1429].
It's should be an issue with mkdir of ViewFs.java.
The scenario is:
mount link /a/b/c --> hdfs://nn1/a/b/c
fallback --> hdfs://nn1/
now if you try to create hdfs://nn1/a/b, it might end up creating a dir in
hdfs://nn1/a/b, It should just return saying dir already exist in mount.
because it will check the parent dir first, that is hdfs://nn1/a/. Since /a is
an internal dir, it will go to InternalViewFS#mkdir with path as /b to create.
Here it should check if internalViewFS /a existing children matching with the
path /b. Yes, there is ia path already in mount link /a/b, so it should not
create this path in fallback. We did not have that children check in
[ViewFs.java|https://github.com/apache/hadoop/blob/5d8600e80ad7864b332b60d5a01585fdf00848ee/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFs.java#L1185]
> mkdir should not create dir in fallback if the dir already in mount Path
> ------------------------------------------------------------------------
>
> Key: HDFS-15444
> URL: https://issues.apache.org/jira/browse/HDFS-15444
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Uma Maheswara Rao G
> Assignee: Uma Maheswara Rao G
> Priority: Major
>
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