Hadoop Common
  1. Hadoop Common
  2. HADOOP-6904

A baby step towards inter-version RPC communications


    • Type: New Feature New Feature
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 0.22.0
    • Fix Version/s: 0.23.0
    • Component/s: ipc
    • Labels:
    • Hadoop Flags:
      Incompatible change, Reviewed


      Currently RPC communications in Hadoop is very strict. If a client has a different version from that of the server, a VersionMismatched exception is thrown and the client can not connect to the server. This force us to update both client and server all at once if a RPC protocol is changed. But sometime different versions do not mean the client & server are not compatible. It would be nice if we could relax this restriction and allows us to support inter-version communications.

      My idea is that DfsClient catches VersionMismatched exception when it connects to NameNode. It then checks if the client & the server is compatible. If yes, it sets the NameNode version in the dfs client and allows the client to continue talking to NameNode. Otherwise, rethrow the VersionMismatch exception.

      1. majorMinorVersion.patch
        16 kB
        Hairong Kuang
      2. majorMinorVersion1.patch
        19 kB
        Hairong Kuang
      3. rpcCompatible-trunk.patch
        22 kB
        Hairong Kuang
      4. rpcCompatible-trunk1.patch
        29 kB
        Hairong Kuang
      5. rpcCompatible-trunk10.patch
        43 kB
        Hairong Kuang
      6. rpcCompatible-trunk11.patch
        43 kB
        Hairong Kuang
      7. rpcCompatible-trunk2.patch
        34 kB
        Hairong Kuang
      8. rpcCompatible-trunk4.patch
        36 kB
        Hairong Kuang
      9. rpcCompatible-trunk5.patch
        37 kB
        Hairong Kuang
      10. rpcCompatible-trunk6.patch
        37 kB
        Hairong Kuang
      11. rpcCompatible-trunk7.patch
        37 kB
        Hairong Kuang
      12. rpcCompatible-trunk8.patch
        38 kB
        Hairong Kuang
      13. rpcCompatible-trunk9.patch
        38 kB
        Hairong Kuang
      14. rpcVersion.patch
        17 kB
        Hairong Kuang
      15. rpcVersion1.patch
        18 kB
        Hairong Kuang

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            • Assignee:
              Hairong Kuang
              Hairong Kuang
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