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