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https://issues.apache.org/jira/browse/HADOOP-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538407#comment-13538407
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Luke Lu commented on HADOOP-9160:
---------------------------------
{code}
- void getSomeAdminValue();
+ Long getSomeAdminValue();
{code}
of course. Fancier return value type involves some additional annotation, but
fairly straightforward as well: [MXBeans
tutorial|http://docs.oracle.com/javase/tutorial/jmx/mbeans/mxbeans.html].
> Adopt JMX for management protocols
> ----------------------------------
>
> Key: HADOOP-9160
> URL: https://issues.apache.org/jira/browse/HADOOP-9160
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Luke Lu
>
> Currently we use Hadoop RPC (and some HTTP, notably fsck) for admin
> protocols. We should consider moving all admin protocols to JMX, as it's the
> industry standard for java server management with wide client support.
> Having an alternative/redundant RPC mechanism is very desirable for admin
> protocols. I've seen in the past in multiple cases, where NN and/or JT RPC
> were locked up solid due to various bugs and/or RPC thread pool exhaustion,
> while HTTP and/or JMX worked just fine.
> Other desirable benefits include admin protocol backward compatibility and
> introspectability, which is convenient for a centralized management system to
> manage multiple Hadoop clusters of different versions. Another notable
> benefit is that it's much easier to implement new admin commands in JMX
> (especially with MXBean) than Hadoop RPC, especially in trunk (and 0.23+,
> 2.x).
> Since Hadoop RPC doesn't guarantee backward compatibility (probably not ever
> for branch-1), there is few external tools depending on it. We can keep the
> old protocol for as long as needed. New commands will be in JMX. The
> transition can be gradual and backward-compatible.
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