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From "Amithsha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14220) Enable Replica Placement Value Per Rack
Date Tue, 04 Jun 2019 04:20:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855295#comment-16855295
] 

Amithsha commented on HDFS-14220:
---------------------------------

[~ayushtkn]  This patch is sufficient to solve our use case. 

> Enable Replica Placement Value Per Rack
> ---------------------------------------
>
>                 Key: HDFS-14220
>                 URL: https://issues.apache.org/jira/browse/HDFS-14220
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.1
>            Reporter: Amithsha
>            Assignee: Ayush Saxena
>            Priority: Major
>         Attachments: HDFS-14220-01.patch, HDFS-14220-02.patch
>
>
> By default, Replica placement per rack will be taken care by  BlockPlacementPolicyDefault.java
.
> With 2 if conditions 
>  # numOfRacks <1 
>  # numOfRacks > 1
> and the placement will happen as 1 on localrack, 2 on remote rack.
> If a user needs max of 1 replica per rack then BlockPlacementPolicyDefault.java modification
is needed instead we can add a property to specify the placement policy and replica value
per rack.
>  
>  



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