[jira] [Created] (HDFS-10187) Add a "list" refresh handler to list all registered refresh identifiers/handlers

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

Wei-Chiu Chuang created HDFS-10187:
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             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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