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https://issues.apache.org/jira/browse/HDFS-14045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16687437#comment-16687437
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Jiandan Yang commented on HDFS-14045:
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Hi, [~elgoiri], I see what you mean.
{quote}
For the Unknown-Unknown, I'm not sure is worth showing them, we should just not
store those, what we had already covered this.
{quote}
Absolutely right, there is no need to metric for the Unknown-Unknown
{quote}
For the ns0-Unknown, we should just make it ns0.
{quote}
This is a very good suggestion and thank you very much.
I've update code according to your comments in [^HDFS-14045.011.patch]
> Use different metrics in DataNode to better measure latency of
> heartbeat/blockReports/incrementalBlockReports of Active/Standby NN
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14045
> URL: https://issues.apache.org/jira/browse/HDFS-14045
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Jiandan Yang
> Assignee: Jiandan Yang
> Priority: Major
> Attachments: HDFS-14045.001.patch, HDFS-14045.002.patch,
> HDFS-14045.003.patch, HDFS-14045.004.patch, HDFS-14045.005.patch,
> HDFS-14045.006.patch, HDFS-14045.007.patch, HDFS-14045.008.patch,
> HDFS-14045.009.patch, HDFS-14045.010.patch
>
>
> Currently DataNode uses same metrics to measure rpc latency of NameNode, but
> Active and Standby usually have different performance at the same time,
> especially in large cluster. For example, rpc latency of Standby is very long
> when Standby is catching up editlog. We may misunderstand the state of HDFS.
> Using different metrics for Active and standby can help us obtain more
> precise metric data.
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