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

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

     [ https://issues.apache.org/jira/browse/HDFS-10187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang updated HDFS-10187:
-----------------------------------
    Attachment: HDFS-10187.001.patch

Rev01: added the list refresh handler, a test case to verify it is added by default, command line help/usage, and updated documentation.

> 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
>              Labels: supportability
>         Attachments: HDFS-10187.001.patch
>
>
> 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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