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https://issues.apache.org/jira/browse/HDFS-10187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15204985#comment-15204985
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Wei-Chiu Chuang commented on HDFS-10187:
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Test failures are all known bugs and unrelated.
The checkstyle warning need to be addressed though.
> 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: commandline, 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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