[jira] [Resolved] (HDFS-9127) Re-replication for files with enough replicas in single rack

["Vinayakumar B (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-9127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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