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https://issues.apache.org/jira/browse/HDFS-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502889#comment-16502889
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Chao Sun commented on HDFS-13641:
---------------------------------
Hmm. Did you get error message like this:
{code}
java.lang.AssertionError: Expected exactly one metric for name
EditLogFetchTimeNumOps
Expected :1
Actual :0
{code}
If so, it seems you can get this error even with a non-exist metric name.
> 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,
> HDFS-13641.001.patch, HDFS-13641.002.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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