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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7770) Need document for storage type label of data node storage locations under dfs.data.dir
Date Thu, 30 Apr 2015 12:17:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14521404#comment-14521404
] 

Hudson commented on HDFS-7770:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #170 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/170/])
HDFS-7770. Need document for storage type label of data node storage locations under dfs.data.dir.
Contributed by Xiaoyu Yao. (aajisaka: rev de9404f02f36bf9a1100c67f41db907d494bb9ed)
* hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/ArchivalStorage.md


> Need document for storage type label of data node storage locations under dfs.data.dir
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-7770
>                 URL: https://issues.apache.org/jira/browse/HDFS-7770
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.6.0
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>             Fix For: 2.8.0, 2.7.1
>
>         Attachments: HDFS-7700.01.patch, HDFS-7770.00.patch, HDFS-7770.02.patch
>
>
> HDFS-2832 enables 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. 
> 1. 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,[ARCHIVE]file:///hddata/dn/archive0</value>
>   </property>
> {code}
> 2. Add a short description of [DISK/SSD/ARCHIVE/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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