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https://issues.apache.org/jira/browse/HDFS-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500588#comment-16500588
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Erik Krogen commented on HDFS-13641:
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{quote}
Curious: do you know roughly how much performance hit it would be by turning on
percentiles on NN?
{quote}
There is some discussion in the comments on HDFS-10475, around
[here|https://issues.apache.org/jira/browse/HDFS-10475?focusedCommentId=15488879&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15488879].
You can also see tickets HADOOP-13521 and HBASE-15222
> Add metrics for edit log tailing
> ---------------------------------
>
> Key: HDFS-13641
> URL: https://issues.apache.org/jira/browse/HDFS-13641
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: metrics
> Reporter: Chao Sun
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-13641-HDFS-12943.000.patch, HDFS-13641.000.patch
>
>
> We should add metrics for each iteration of edit log tailing, including 1) #
> of edits loaded, 2) time spent in select input edit stream, 3) time spent in
> loading the edits, 4) interval between the iterations.
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