[jira] [Created] (HADOOP-11577) Need document for storage type label of data node storage locations under dfs.data.dir

["Xiaoyu Yao (JIRA)" <ji...@apache.org>]

Xiaoyu Yao created HADOOP-11577:
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             Summary: Need document for storage type label of data node storage locations under dfs.data.dir
                 Key: HADOOP-11577
                 URL: https://issues.apache.org/jira/browse/HADOOP-11577
             Project: Hadoop Common
          Issue Type: Improvement
    Affects Versions: 2.6.0
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


HDFS-2832 enable support for heterogeneous storages in HDFS, which allows DN as a collection of storages with different types. However, I can't find document on how to label different storage types from the following two documents. I found the information from the design spec.It will be good we document this for admins and users to use the related Archival storage and storage policy features. 

http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html

http://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml

This JIRA is opened to add document for the new storage type labels. I propose to add an example under ArchivalStorage.html#Configuration section:

{code}
  <property>
    <name>dfs.data.dir</name>
    <value>[DISK]file:///hddata/dn/disk0,  [SSD]file:///hddata/dn/ssd0,[ARCHIVAL]file:///hddata/dn/archival0</value>,
  </property>
{code}

Also add a short description of [DISK/SSD/ARCHIVAL/RAM_DISK] options in hdfs-default.xml#dfs.data.dir and document DISK as storage type if no storage type is labeled in the data node storage location configuration. 




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