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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13641) Add metrics for edit log tailing
Date Wed, 06 Jun 2018 07:01:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502889#comment-16502889
] 

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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