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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