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  1. ZooKeeper
  2. ZOOKEEPER-1495

ZK client hangs when using a function not available on the server.

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 3.4.2, 3.3.5
    • 3.4.6, 3.5.0
    • server
    • None
    • all

    • Reviewed

    Description

      This happens for example when using zk#multi with a 3.4 client but a 3.3 server.

      The issue seems to be on the server side: the servers drops the packets with an unknown OpCode in ZooKeeperServer#submitRequest

      public void submitRequest(Request si) {
          // snip
          try {
              touch(si.cnxn);
              boolean validpacket = Request.isValid(si.type); // ===> Check on case OpCode.*
              if (validpacket) {
                  // snip
              } else {
                  LOG.warn("Dropping packet at server of type " + si.type);
                  // if invalid packet drop the packet.
              }
          } catch (MissingSessionException e) {
              if (LOG.isDebugEnabled()) {
                  LOG.debug("Dropping request: " + e.getMessage());
              }
          }
      }
      

      The solution discussed in ZOOKEEPER-1381 would be to get an exception on the client side then & close the session.

      Attachments

        1. ZOOKEEPER-1495.patch
          7 kB
          Skye Wanderman-Milne
        2. ZOOKEEPER-1495.2.patch
          7 kB
          Edward Ribeiro
        3. ZOOKEEPER-1495_branch34.patch
          7 kB
          Skye Wanderman-Milne
        4. 1495.br33.v3.patch
          6 kB
          Nicolas Liochon

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              nkeywal Nicolas Liochon
              nkeywal Nicolas Liochon
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                Created:
                Updated:
                Resolved: