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https://issues.apache.org/jira/browse/HADOOP-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13730061#comment-13730061
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Luke Lu commented on HADOOP-9160:
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bq. Making it optional is pretty straightforward.
As I pointed out in the previous review, the patch needs to be improved to
incorporate hadoop authz (HttpServer#isInstrumentationAccessAllowed for read
and HttpServer#hasAdministratorAccess for write), which would involve a simple
wrapper to extend the original AgentServlet. I think a _compile_ time
dependency (a la jersey) would be more appropriate if you really want the
runtime dependency to be optional.
OTOH, I personally prefer a static dependency for simplicity and UX, because if
a user enables jolokia and the jar is not not there, there'd be another cryptic
class not found error in the log to chase down. jolokia-core jar is only 200+KB
which is a small fraction of common dependencies.
bq. it may end up on the classpath of client side apps.
The hadoop-client module (HADOOP-8009) should address most of the client side
issues. For YARN app side dependencies, monitoring too useful to save the 200KB
initial dist cache copies...
> Adopt Jolokia as the JMX HTTP/JSON bridge.
> ------------------------------------------
>
> Key: HADOOP-9160
> URL: https://issues.apache.org/jira/browse/HADOOP-9160
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Luke Lu
> Assignee: Junping Du
> Labels: features
> Attachments: hadoop-9160-demo-branch-1.txt, HADOOP-9160.patch
>
>
> The current JMX HTTP bridge has served its purpose, while a more complete
> solution: Jolokia (formerly Jmx4Perl) has been developed/matured over the
> years.
> Jolokia provides comprehensive JMX features over HTTP/JSON including search
> and list of JMX attributes and operations metadata, which helps to support
> inter framework/platform compatibility. It has first class language bindings
> for Perl, Python, Javascript, Java.
> It's trivial (see demo patch) to incorporate Jolokia servlet into Hadoop HTTP
> servers and use the same security mechanisms.
> Adopting Jolokia will substantially improve the manageability of Hadoop and
> its ecosystem.
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