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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10187) Add a "list" refresh handler to list all registered refresh identifiers/handlers
Date Mon, 21 Mar 2016 14:49:25 GMT
Wei-Chiu Chuang created HDFS-10187:
--------------------------------------

             Summary: Add a "list" refresh handler to list all registered refresh identifiers/handlers
                 Key: HDFS-10187
                 URL: https://issues.apache.org/jira/browse/HDFS-10187
             Project: Hadoop HDFS
          Issue Type: New Feature
    Affects Versions: 2.7.2
            Reporter: Wei-Chiu Chuang
            Assignee: Wei-Chiu Chuang


HADOOP-10376 added a new feature to register handlers for refreshing daemon configurations,
because name node properties can be reconfigured without restarting the daemon. This can be
a very useful generic interface, but so far no real handlers have been registered using this
interface. I added a new 'list' handler to list all registered handlers. My plan is to add
more handlers in the future using this interface.

Another minor fix is return a more explicit error message to the client if a handler is not
registered. (It is currently logged at namenode side, but client side only gets a "Failed
to get response." message without knowing why)



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