[jira] [Commented] (HDFS-14546) Document block placement policies

["Íñigo Goiri (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-14546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857224#comment-16857224 ] 

Íñigo Goiri commented on HDFS-14546:
------------------------------------

There was some initial effort in HDFS-8945.
The main changes should go to {{HdfsDesign.md}} but then we need pointers.


> Document block placement policies
> ---------------------------------
>
>                 Key: HDFS-14546
>                 URL: https://issues.apache.org/jira/browse/HDFS-14546
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Íñigo Goiri
>            Priority: Major
>              Labels: documentation
>
> Currently, all the documentation refers to the default block placement policy.
> However, over time there have been new policies:
> * BlockPlacementPolicyRackFaultTolerant (HDFS-7891)
> * BlockPlacementPolicyWithNodeGroup (HDFS-3601)
> * BlockPlacementPolicyWithUpgradeDomain (HDFS-9006)
> We should update the documentation to refer to them explaining their particularities and probably how to setup each one of them.



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