[jira] [Created] (NIFI-10167) Allow tracking of detailed metrics such as CPU Usage by processors

["Mark Payne (Jira)" <ji...@apache.org>]

Mark Payne created NIFI-10167:
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             Summary: Allow tracking of detailed metrics such as CPU Usage by processors
                 Key: NIFI-10167
                 URL: https://issues.apache.org/jira/browse/NIFI-10167
             Project: Apache NiFi
          Issue Type: New Feature
          Components: Core Framework
            Reporter: Mark Payne
            Assignee: Mark Payne


NiFi offers a great deal of detail on the canvas about how much data was read/written in the past 5 minutes, number of tasks run, and how much time that took.

However, a question we are often asked is "which processors are using up all of my CPU?" From looking at tools like {{top}} we can see that NiFi is using a lot of CPU. And we can guess, based on the fact that Processor A spent 50 minutes of Processing time over the past 5 minutes that Processor A is likely using a lot of resources. But we cannot really know for sure how much CPU it is using vs. disk/socket I/O waits, etc.

This task will introduce more detailed metrics such as how many seconds of CPU time a processor has consumed, how much time it has spent reading/writing to the content repo, etc. These metrics should be exposed via the {{nifi.sh diagnostics}} command.

We should make clear both how much of a Processor's time is spent using CPU, as well as what percentage of the total CPU used by NiFi was spent for a given Processor. This will significantly help understand the resource usage characteristics of a given component.

However, tracking this may be expensive. So we should provide the ability to turn this feature on/off and ideally also allow for sampling of metrics and extrapolating out those numbers so that we can monitor these things only for a percentage of invocations and then give reasonable estimations based on that.



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