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From "Pan Yuxuan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9902) dfs.datanode.du.reserved should be difference between StorageType DISK and RAM_DISK
Date Fri, 04 Mar 2016 07:44:40 GMT
Pan Yuxuan created HDFS-9902:
--------------------------------

             Summary: 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


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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