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https://issues.apache.org/jira/browse/HDFS-14220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855930#comment-16855930
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Íñigo Goiri commented on HDFS-14220:
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There are a few other block placement policies in addition to the default one:
https://github.com/apache/hadoop/tree/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement
You can see:
* BlockPlacementPolicyWithNodeGroup
* BlockPlacementPolicyRackFaultTolerant
* BlockPlacementPolicyWithUpgradeDomain
I have the feeling that one of those may cover your use case.
We can go into more detail if you don't see any of them fit.
> 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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