[jira] [Created] (KUDU-2110) RPC footer may be appended more than once

["Michael Ho (JIRA)" <ji...@apache.org>]

Michael Ho created KUDU-2110:
--------------------------------

             Summary: RPC footer may be appended more than once
                 Key: KUDU-2110
                 URL: https://issues.apache.org/jira/browse/KUDU-2110
             Project: Kudu
          Issue Type: Bug
          Components: rpc
    Affects Versions: 1.5.0
            Reporter: Michael Ho
            Assignee: Michael Ho
            Priority: Blocker


The fix for KUDU-2065 included a footer to RPC messages. The footer is appended during the beginning of the transmission of the outbound transfer for an outbound call. However, the check for the beginning of transmission for an outbound call isn't quite correct as it's possible for an outbound transfer to not send anything in Transfer::SendBuffer().

{noformat}
    // Transfer for outbound call must call StartCallTransfer() before transmission can
    // begin to append footer to the payload if the remote supports it.
    if (!transfer->TransferStarted() &&
        transfer->is_for_outbound_call() &&
        !StartCallTransfer(transfer)) {
      OutboundQueuePopFront();
      continue;
    }
{noformat}



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