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  1. Hadoop Common
  2. HADOOP-7001

Allow configuration changes without restarting configured nodes


    • Type: Task
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.23.0
    • Component/s: conf
    • Labels:
    • Hadoop Flags:


      Currently, changing the configuration on a node (e.g., the name node) requires that we restart the node. We propose a change that would allow us to make configuration changes without restarting. Nodes that support configuration changes at run time should implement the following interface:

      interface ChangeableConfigured extends Configured {
      void changeConfiguration(Configuration newConf) throws ConfigurationChangeException;

      The contract of changeConfiguration is as follows:
      The node will compare newConf to the existing configuration. For each configuration property that is set to a different value than in the current configuration, the node will either adjust its behaviour to conform to the new configuration or throw a ConfigurationChangeException if this change is not possible at run time. If a configuration property is set in the current configuration but is unset in newConf, the node should use its default value for this property. After a successful invocation of changeConfiguration, the behaviour of the configured node should be indistinguishable from the behaviour of a node that was configured with newConf at creation.

      It should be easy to change existing nodes to implement this interface. We can start by throwing the exception for all changes and then gradually start supporting more and more changes at run time. (We might even consider replacing Configured with ChangeableConfigured entirely, but I think the proposal above afford greater flexibility).


        1. reconfigurable.patch
          9 kB
          Patrick Kling
        2. HADOOP-7001.patch
          32 kB
          Patrick Kling
        3. HADOOP-7001.2.patch
          32 kB
          Patrick Kling
        4. HADOOP-7001.3.patch
          37 kB
          Patrick Kling
        5. HADOOP-7001.4.patch
          31 kB
          Patrick Kling
        6. HADOOP-7001.5.patch
          31 kB
          Patrick Kling

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              • Assignee:
                pkling Patrick Kling
                pkling Patrick Kling
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