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https://issues.apache.org/jira/browse/HADOOP-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486537
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Raghu Angadi commented on HADOOP-620:
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Test. Please ignore:
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> replication factor should be calucalated based on actual dfs block sizes at
> the NameNode.
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-620
> URL: https://issues.apache.org/jira/browse/HADOOP-620
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Reporter: Raghu Angadi
> Assigned To: Raghu Angadi
> Priority: Minor
>
> Currently 'dfs -report' calculates replication facto like the following :
> (totalCapacity - totalDiskRemaining) / (totalSize of dfs files in Name
> space).
> Problem with this is that this includes disk space used by non-dfs files
> (e.g. map reduce jobs) on data node. On my single node test, I get
> replication factor of 100 since I have a 1 GB dfs file with out replication
> and there is 99GB of unrelated data on the same volume.
> ideally name should calculate it with : (total size of all the blocks known
> to it) / (total size of files in Name space).
> Initial proposal to keep 'total size of all the blocks' update is to track it
> in datanode descriptor and update it when namenode receives block reports
> from the datanode ( and subtract when the datanode is removed).
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