[GitHub] [hadoop-ozone] avijayanhwx opened a new pull request #68: HDDS-2320. Negative value seen for OM NumKeys Metric in JMX.

[GitBox <gi...@apache.org>]

avijayanhwx opened a new 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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