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https://issues.apache.org/jira/browse/HDFS-839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801973#action_12801973
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dhruba borthakur commented on HDFS-839:
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Todd: I agree that CPU is not what I am concerned about. The problem is two
fold: if the NN dddecided to forward each and every message to the backupnode
(as soon as it received it) then we have the problem of keeping the global lock
for longer durations of time. If we buffer these messages to be send by other
thread asynchronously, then we put additional memory pressure on the namenode.
Do you agree?
> 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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