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  1. Hadoop HDFS
  2. HDFS-14563

Enhance interface about recommissioning/decommissioning

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    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: hdfs-client, namenode
    • Labels:


      In current implementation, if we need to decommissioning or recommissioning one datanode, the only way is add the datanode to include or exclude file under namenode configuration path then execute command `bin/hadoop dfsadmin -refreshNodes` and trigger namenode to reload include/exclude and start to recommissioning or decommissioning datanode.
      The shortcomings of this approach is that:
      a. namenode reload include/exclude configuration file from devices, if I/O load is high, handler may be blocked.
      b. namenode has to process every datnodes in include and exclude configurations, if there are many datanodes (very common for large cluster) pending to process, namenode will be hung for hundred seconds to wait recommision/decommision finish at the worst since holding write lock.
      I think we should expose one lightweight interface to support recommissioning or decommissioning single datanode, thus we can operate datanode using dfsadmin more smooth.


        1. HDFS-14563.001.patch
          25 kB
          Xiaoqiao He
        2. HDFS-14563.002.patch
          39 kB
          Xiaoqiao He
        3. mt_mode-2.txt
          22 kB
          Kihwal Lee



            • Assignee:
              hexiaoqiao Xiaoqiao He
              hexiaoqiao Xiaoqiao He


              • Created:

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