[jira] [Created] (HDDS-3775) Add documentation for flame graph

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

Wei-Chiu Chuang created HDDS-3775:
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             Summary: Add documentation for flame graph 
                 Key: HDDS-3775
                 URL: https://issues.apache.org/jira/browse/HDDS-3775
             Project: Hadoop Distributed Data Store
          Issue Type: Task
            Reporter: Wei-Chiu Chuang


HDDS-1116 added flame graph but looks like there's no documentation to enable it.

To enable it,
add configuration hdds.profiler.endpoint.enabled = true to ozone-site.xml
download the profiler from https://github.com/jvm-profiling-tools/async-profiler to a local directory, say /tmp and start the DataNode with java system property -Dasync.profiler.home=/tmp or environment variable $ASYNC_PROFILER_HOME

and then go to the datanode servlet, say dn1:9883/prof to see the graph.



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