[jira] [Created] (HDFS-15638) Make Hive tables directory permission check flat

["Xinli Shang (Jira)" <ji...@apache.org>]

Xinli Shang created HDFS-15638:
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             Summary: Make Hive tables directory permission check flat 
                 Key: HDFS-15638
                 URL: https://issues.apache.org/jira/browse/HDFS-15638
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
            Reporter: Xinli Shang


Problem: Currently, when a user tries to accesses a file he/she needs not only the permission of that file but also the permissions of it's parent and ancestors. This is correct, but for Hive tables directory/files, all the files under a partition or even a table usually have the same permissions for the same set of ACL groups. Although the permissions and ACL groups are the same, the writer sometimes still need to call setfacl() for every file. This results in a huge amount of RPC calls to NN. HDFS has default ACL to solve that but that only applies to create and copy, but not apply for rename. However, in Hive ETL, rename is very common. 

Proposal: Add a 1-bit flag to directory inodes to indicate whether or not it is a Hive table directory. If that flag is set, then all the sub-directory and files under it will just use it's permission and ACL groups settings. By doing this way, Hive ETL doesn't need to set permissions at the file level. If that flag is not set(by default), work as before. To set/unset that flag, it would require admin privilege. 

 

 

 

 

 

 



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