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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11049) The description of dfs.block.replicator.classname is not clear
Date Thu, 27 Oct 2016 10:38:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15611491#comment-15611491
] 

Yiqun Lin commented on HDFS-11049:
----------------------------------

Thanks [~ajisakaa] for the commit!

> The description of dfs.block.replicator.classname is not clear
> --------------------------------------------------------------
>
>                 Key: HDFS-11049
>                 URL: https://issues.apache.org/jira/browse/HDFS-11049
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>            Priority: Minor
>             Fix For: 2.9.0, 3.0.0-alpha2
>
>         Attachments: HDFS-11049.001.patch, HDFS-11049.002.patch
>
>
> Now the description of the property {{dfs.block.replicator.classname}} seems not clearly.
The current description:
> {code}
> <property>
>   <name>dfs.block.replicator.classname</name>  <value>org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicyDefault</value>
>   <description>
>     Class representing block placement policy for non-striped files.
>   </description>
> </property>
> {code}
> It seems too simple and the users will not get the other available block placement policies
and its usage. For example in HDFS-7541, it introduced     a new policy {{BlockPlacementPolicyWithUpgradeDomain}}.
This policy can be good used in rolling upgrade opeations.
> In addition, I don't find other documentations that concretely introducing the existing
placement policies. This JIRA foucus on making a improvement for this in file {{hdfs-default.xml}}.



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