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https://issues.apache.org/jira/browse/HADOOP-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13537873#comment-13537873
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Junping Du commented on HADOOP-9160:
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Hi Steve, I think NN already had MXBeans. Am I missing something?
> Change management protocol to JMX
> ---------------------------------
>
> 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 are no external management tools depending on it. We can
> maintain a practical backward compatibility by keeping the admin
> script/command line interface unchanged.
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