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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9160) Adopt JMX for management protocols
Date Fri, 21 Dec 2012 21:01:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13538407#comment-13538407
] 

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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