[jira] [Updated] (HDFS-9902) dfs.datanode.du.reserved should be difference between StorageType DISK and RAM_DISK

["Brahma Reddy Battula (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-9902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brahma Reddy Battula updated HDFS-9902:
---------------------------------------
    Status: Patch Available  (was: Open)

> dfs.datanode.du.reserved should be difference between StorageType DISK and RAM_DISK
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-9902
>                 URL: https://issues.apache.org/jira/browse/HDFS-9902
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.2
>            Reporter: Pan Yuxuan
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-9902-02.patch, HDFS-9902.patch
>
>
> Now Hadoop support different storage type for DISK, SSD, ARCHIVE and RAM_DISK, but they share one configuration dfs.datanode.du.reserved.
> The DISK size may be several TB and the RAM_DISK size may be only several tens of GB.
> The problem is that when I configure DISK and RAM_DISK (tmpfs) in the same DN, and I set  dfs.datanode.du.reserved values 10GB, this will waste a lot of RAM_DISK size. 
> Since the usage of RAM_DISK can be 100%, so I don't want dfs.datanode.du.reserved configured for DISK impacts the usage of tmpfs.
> So can we make a new configuration for RAM_DISK or just skip this configuration for RAM_DISK?



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