[jira] [Work logged] (HDDS-2415) Completely disable tracer if hdds.tracing.enabled=false

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-2415?focusedWorklogId=340042&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-340042 ]

ASF GitHub Bot logged work on HDDS-2415:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 07/Nov/19 17:20
            Start Date: 07/Nov/19 17:20
    Worklog Time Spent: 10m 
      Work Description: adoroszlai commented on pull request #128: HDDS-2415. Completely disable tracer if hdds.tracing.enabled=false
URL: https://github.com/apache/hadoop-ozone/pull/128
 
 
   ## What changes were proposed in this pull request?
   
   Skip registering a real tracer with `GlobalTracer` if `hdds.tracing.enabled` is set to `false`.  This lets us avoid tracer-related busywork.
   
   https://issues.apache.org/jira/browse/HDDS-2415
   
   ## How was this patch tested?
   
   1. Checked Jaeger in `ozoneperf` cluster with default config, verified that it shows traces (OM, SCM, DN, Freon, S3 shell, Ozone shell)
   2. With `OZONE-SITE.XML_hdds.tracing.enabled=false` added to `docker-config`, verified that Jaeger shows no traces
   3. Also with tracing disabled in `ozone` cluster, verified that `GlobalTracer` no longer shows up in breakdown of allocations from `HddsDispatcher.dispatch` in the profiler
 
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Issue Time Tracking
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            Worklog Id:     (was: 340042)
    Remaining Estimate: 0h
            Time Spent: 10m

> Completely disable tracer if hdds.tracing.enabled=false
> -------------------------------------------------------
>
>                 Key: HDDS-2415
>                 URL: https://issues.apache.org/jira/browse/HDDS-2415
>             Project: Hadoop Distributed Data Store
>          Issue Type: Improvement
>            Reporter: Attila Doroszlai
>            Assignee: Attila Doroszlai
>            Priority: Minor
>              Labels: perfomance, pull-request-available
>         Attachments: allocations.png
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> There is a config setting to enable/disable OpenTracing-based distributed tracing in Ozone ({{hdds.tracing.enabled}}).  However, setting it to false does not prevent tracer initialization, which causes unnecessary object allocations.



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