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https://issues.apache.org/jira/browse/HDDS-2320?focusedWorklogId=331557&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-331557
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ASF GitHub Bot logged work on HDDS-2320:
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Author: ASF GitHub Bot
Created on: 21/Oct/19 18:09
Start Date: 21/Oct/19 18:09
Worklog Time Spent: 10m
Work Description: avijayanhwx commented on pull request #68: HDDS-2320.
Negative value seen for OM NumKeys Metric in JMX.
URL: https://github.com/apache/hadoop-ozone/pull/68
## What changes were proposed in this pull request?
After running teragen, I noticed that the NumKeys metric in OzoneManager JMX
had a negative value. On investigation, it was seen that we decrease the
numkeys metric while deleting any key (including directory), but do not
increment NumKeys when we create a directory. To keep it consistent, the change
proposes increasing NumKeys while creating directories as well. This
essentially means that the "NumKeys" is a pure OM metric that tracks the number
of entries it manages as opposed to the number of files that are managed by SCM
and Ratis.
## What is the link to the Apache JIRA
https://issues.apache.org/jira/browse/HDDS-2320
## How was this patch tested?
Manually tested on cluster. Added unit test.
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Issue Time Tracking
-------------------
Worklog Id: (was: 331557)
Remaining Estimate: 0h
Time Spent: 10m
> Negative value seen for OM NumKeys Metric in JMX.
> -------------------------------------------------
>
> Key: HDDS-2320
> URL: https://issues.apache.org/jira/browse/HDDS-2320
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Components: Ozone Manager
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Major
> Labels: pull-request-available
> Attachments: Screen Shot 2019-10-17 at 11.31.08 AM.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> While running teragen/terasort on a cluster and verifying number of keys
> created on Ozone Manager, I noticed that the value of NumKeys counter metric
> to be a negative value !Screen Shot 2019-10-17 at 11.31.08 AM.png! .
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