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https://issues.apache.org/jira/browse/HDFS-839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801188#action_12801188
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Wang Xu commented on HDFS-839:
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@dhruba
If NN synchronizes all heartbeats to BN in a not very small cluster
synchronized, it will be DDoS. However, if it only synchronizes block reports
or not sync all heartbeats, it might increase NN's load slightly. After all it
need synchronize namespace operations to BN.
And I also think the under replicated list may be a trouble if NN and BN are
managing blocks seperately.
> The NameNode should forward block reports to BackupNode
> -------------------------------------------------------
>
> Key: HDFS-839
> URL: https://issues.apache.org/jira/browse/HDFS-839
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> The BackupNode (via HADOOP-4539) receives a stream of transactions from
> NameNode. However, the BackupNode does not have block locations of blocks. It
> would be nice if the NameNode can forward all block reports (that it receives
> from DataNodes) to the BackupNode.
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