YUBI LEE created HDFS-17877:
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Summary: DatanodeID.updateRegInfo() does not update hostNameBytes
causing stale hostname on client
Key: HDFS-17877
URL: https://issues.apache.org/jira/browse/HDFS-17877
Project: Hadoop HDFS
Issue Type: Bug
Reporter: YUBI LEE
DataNodeID.updateRegInfo() updates hostName but misses hostNameBytes.
Since PBHelperClient.convert(DatanodeID) uses getHostNameBytes() for protobuf
serialization, clients end up receiving the stale hostname from before the
re-registration.
This becomes a real problem when a DataNode first registers with a PQDN and
later re-registers with a FQDN. With dfs.client.use.datanode.hostname=true,
the client tries to connect using the old PQDN and fails with
UnknownHostException.
The fix is to add hostNameBytes = nodeReg.getHostNameBytes() in updateRegInfo(),
same as how setIpAndXferPort() already handles ipAddr/ipAddrBytes together
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