[jira] [Created] (HADOOP-19408) RPC clients cannot tolerate hostname changes from DNS resolution.

["Chris Nauroth (Jira)" <ji...@apache.org>]

Chris Nauroth created HADOOP-19408:
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             Summary: RPC clients cannot tolerate hostname changes from DNS resolution.
                 Key: HADOOP-19408
                 URL: https://issues.apache.org/jira/browse/HADOOP-19408
             Project: Hadoop Common
          Issue Type: Bug
          Components: ipc
    Affects Versions: 3.3.5, 3.4.0
            Reporter: Chris Nauroth


HADOOP-15129 changed RPC connections so that if a client is initialized before the server boots, it can re-resolve DNS to discover the updated address and complete a successful connection. HADOOP-18365 addressed a remaining problem with an old IP address remaining in the {{ConnectionId}} after the retry. Unfortunately, this has also reintroduced the problem that HADOOP-15129 tried to address, because it disallows hostname changes:

{{
      if (!Objects.equals(this.address.getHostName(), address.getHostName())) {
        throw new IllegalArgumentException("Hostname must match: " + this.address + " vs "
            + address);
      }
}}




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