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HBASE-25531 Minor improvement to Profiler Servlet doc (#2905) 

Signed-off-by: Sean Busbey <busbey@apache.org>
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Nick Dimiduk 2021-01-26 16:14:53 -08:00 committed by GitHub
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src/main/asciidoc/_chapters/profiler.adoc
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@ -29,20 +29,26 @@
== Background
HBASE-21926 introduced a new servlet that supports integrated profiling via async-profiler.
https://issues.apache.org/jira/browse/HBASE-21926[HBASE-21926] introduced a new servlet that
supports integrated, on-demand profiling via the
https://github.com/jvm-profiling-tools/async-profiler[Async Profiler] project.
== Prerequisites
Go to https://github.com/jvm-profiling-tools/async-profiler, download a release appropriate for your platform, and install on every cluster host.
If 4.6 or later linux, be sure to set proc variables as per 'Basic Usage' section in the
<a href="https://github.com/jvm-profiling-tools/async-profiler">Async Profiler Home Page</a>
(Not doing this will draw you diagrams with no content).
Go to the https://github.com/jvm-profiling-tools/async-profiler[Async Profiler Home Page], download
a release appropriate for your platform, and install on every cluster host. If running a Linux
kernel v4.6 or later, be sure to set proc variables as per the
https://github.com/jvm-profiling-tools/async-profiler#basic-usage[Basic Usage] section. Not doing
so will result in flame graphs that contain no content.
Set `ASYNC_PROFILER_HOME` in the environment (put it in hbase-env.sh) to the root directory of the async-profiler install location, or pass it on the HBase daemon's command line as a system property as `-Dasync.profiler.home=/path/to/async-profiler`.
Set `ASYNC_PROFILER_HOME` in the environment (put it in hbase-env.sh) to the root directory of the
async-profiler install location, or pass it on the HBase daemon's command line as a system property
as `-Dasync.profiler.home=/path/to/async-profiler`.
== Usage
Once the prerequisites are satisfied, access to async-profiler is available by way of the HBase UI or direct interaction with the infoserver.
Once the prerequisites are satisfied, access to async-profiler is available by way of the HBase UI
or direct interaction with the infoserver.
Examples: