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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-9160) Change management protocol to JMX
Date Thu, 20 Dec 2012 08:47:12 GMT
Luke Lu created HADOOP-9160:

             Summary: 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+,

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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