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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9160) Adopt JMX for management protocols
Date Fri, 04 Jan 2013 18:10:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13544086#comment-13544086
] 

Todd Lipcon commented on HADOOP-9160:
-------------------------------------

I agree that a plug-in like interface is a reasonably viable solution.

In past Hadoop versions, we used the plugin interface to expose a Thrift endpoint for various
management protocols. This made it trivial to access various RPCs from Python (in the Hue
project), though had development cost in having to "duplicate" every API we cared about into
the thrift IDL files.

More and more, I think we should spend a bit of time on a super-simple Hadoop RPC client in
Python or C -- single threaded, blocking, no connection pooling, etc. I think a viable one
could be written in a couple days, and would make it a lot easier to script against the various
APIs without having to load up big heavy Java processes.
                
> 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 adopt JMX for future admin protocols, 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 (as well as
0.23+ and 2.x).
> Since Hadoop RPC doesn't guarantee backward compatibility (probably not ever for branch-1),
there are few external tools depending on it. We can keep the old protocols for as long as
needed. New commands should be in JMX. The transition can be gradual and backward-compatible.

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