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https://issues.apache.org/jira/browse/HADOOP-3058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593915#action_12593915
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Raghu Angadi commented on HADOOP-3058:
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+1 Patch looks fine. I have no idea if this has real penalty on namenode
performance. Mostly it does not affect. Multiple simple integer and long
operation in the critical paths are replaced by methods that synchronize on a
different object.
> Hadoop DFS to report more replication metrics
> ---------------------------------------------
>
> Key: HADOOP-3058
> URL: https://issues.apache.org/jira/browse/HADOOP-3058
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs, metrics
> Reporter: Marco Nicosia
> Assignee: lohit vijayarenu
> Priority: Minor
> Attachments: HADOOP-3058.patch
>
>
> Currently, the namenode and each datanode reports 'blocksreplicatedpersec.'
> We'd like to be able to graph pending replications, vs number of under
> replicated blocks, vs. replications per second, so that we can get a better
> idea of the replication activity within the DFS.
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