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https://issues.apache.org/jira/browse/HDFS-839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801712#action_12801712
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Wang Xu commented on HDFS-839:
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For multiple BN, I think pipeline is unacceptable in performance.
And I agree if DN report to NN could have better performance against the design
that NN sync to BN. But will the under-replicate/invalid block status will
matter?
And can we introduce multcast for multiple NN solution? it may decrease the
network overhead. The issue is that multicast do not provide any guarantee.
> 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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