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https://issues.apache.org/jira/browse/HDFS-4679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628400#comment-13628400
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Andrew Wang commented on HDFS-4679:
-----------------------------------
bq. I noticed that createSymlink does not check isValidName(target)
Sanjay, I think this might be intentional. Symlink targets are supposed to be
stored as-is, and can refer to relative paths and other filesystems
(fully-qualified URIs). {{isValidName}} rejects such paths.
> Namenode operation checks should be done in a consistent manner
> ---------------------------------------------------------------
>
> Key: HDFS-4679
> URL: https://issues.apache.org/jira/browse/HDFS-4679
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HDFS-4679.patch, HDFS-4679.patch
>
>
> Different operations performs checks in different order. I propose
> consistently checking the following in namenode operations:
> # Print debug log related to the operation
> # validate the input parameters, file names
> # Grab read or write lock
> #* check if system is ready for read or write operation
> #* check if system is in safemode (for write operations)
> #* check permissions to see if the user is owner, has access or is super user
> privileges
> # Release the lock
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