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https://issues.apache.org/jira/browse/HADOOP-3058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594314#action_12594314
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Raghu Angadi commented on HADOOP-3058:
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I would think the heartBeat variables will be updated thousands of times every
second. I think better approach would be to update the heavy weight metric
variables only inside {{FSNamesystemMetrics.doUpdates()}} that gets called
every 5 seconds or so. This way these stats become pretty much free and also
sets good precedence for new metrics.
> 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-3058-2.patch, 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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