Elek, Marton created HDDS-1116:
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Summary: Add java profiler servlet to the Ozone web servers
Key: HDDS-1116
URL: https://issues.apache.org/jira/browse/HDDS-1116
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: Elek, Marton
Assignee: Elek, Marton
Thanks to [~gopalv] we learned that [~prasanth_j] implemented a helper servlet
in Hive to initialize new [async
profiler|https://github.com/jvm-profiling-tools/async-profiler] sessions and
provide the svg based flame graph over HTTP. (see HIVE-20202)
It seems to very useful as with this approach the profiling could be very easy.
This patch imports the servlet from the Hive code base to the Ozone code base
with minor modification (to make it work with our servlet containers)
* The two servlets are unified to one
* Streaming the svg to the browser based on IOUtils.copy
* Output message is improved
By default the profile servlet is turned off, but you can enable it with
'hdds.profiler.endpoint.enabled=true' ozone-site.xml settings. In that case you
can access the /prof endpoint from scm,om,s3g.
You should upload the async profiler first
(https://github.com/jvm-profiling-tools/async-profiler) and set the
ASYNC_PROFILER_HOME environment variable to find it.
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