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https://issues.apache.org/jira/browse/HDFS-9127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B resolved HDFS-9127.
---------------------------------
Resolution: Invalid
This problem doesnt exist on latest code.
Feel free to re-open if found again.
> Re-replication for files with enough replicas in single rack
> ------------------------------------------------------------
>
> Key: HDFS-9127
> URL: https://issues.apache.org/jira/browse/HDFS-9127
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
>
> Found while debugging testcases in HDFS-8647
> *Scenario:*
> =======
> Start a cluster with Single rack with three DN's
> write a file with RF=3
> adde two Nodes with different racks
> As per blockplacement policy ([Rack
> Awareness|http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/RackAwareness.html])
> atleast one replica needs to replicate to newly added rack.But it is not
> happening..Because of following reason.
> {color:blue}
> when cluster was single rack,block will be removed from
> {{neededReplications}} after 3 replicas.
> later, after adding new rack, only replications will happen which are present
> in {{neededReplications}}
> So for the blocks which already have enough replicas, new rack replications
> will not take place..
> {color}
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