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https://issues.apache.org/jira/browse/HDFS-15808?focusedWorklogId=554555&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-554555
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ASF GitHub Bot logged work on HDFS-15808:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Feb/21 01:57
Start Date: 19/Feb/21 01:57
Worklog Time Spent: 10m
Work Description: tomscut commented on pull request #2668:
URL: https://github.com/apache/hadoop/pull/2668#issuecomment-781760195
> Just reposting my comment from the jira for visibility.
>
> The patch looks fine, but I doubt the metric will be useful in its current
form. Monotonically increasing counter doesn't tell you much when plotted. Over
time it just becomes an incredibly large number, hard to see its fluctuations.
And you cannot set alerts if the threshold is exceeded often.
> See e.g. ExpiredHeartbeats or LastWrittenTransactionId - not useful.
> I assume you need something like a rate.
Hey @shvachko , thank you for your comments and suggestions. I replied to
you in JIRA.
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Issue Time Tracking
-------------------
Worklog Id: (was: 554555)
Time Spent: 4.5h (was: 4h 20m)
> Add metrics for FSNamesystem read/write lock hold long time
> -----------------------------------------------------------
>
> Key: HDFS-15808
> URL: https://issues.apache.org/jira/browse/HDFS-15808
> Project: Hadoop HDFS
> Issue Type: Wish
> Components: hdfs
> Reporter: tomscut
> Assignee: tomscut
> Priority: Major
> Labels: hdfs, lock, metrics, pull-request-available
> Attachments: lockLongHoldCount
>
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> To monitor how often read/write locks exceed thresholds, we can add two
> metrics(ReadLockWarning/WriteLockWarning), which are exposed in JMX.
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