dzcxzl created HADOOP-18694:
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Summary: Client.Connection#updateAddress needs to ensure that
address is resolved before updating
Key: HADOOP-18694
URL: https://issues.apache.org/jira/browse/HADOOP-18694
Project: Hadoop Common
Issue Type: Improvement
Components: common
Affects Versions: 3.3.5, 3.4.0
Reporter: dzcxzl
When Client.Connection#setupConnection encounters an IOException, it will try
to update the server address.
([HADOOP-18365|https://issues.apache.org/jira/browse/HADOOP-18365])
When the address is re-parsed, it may be an unresolved address
(UnknownHostException), which causes Client.Connection#setupConnection to fail
to reconnect.
{code:java}
while (true) {
try {
if (server.isUnresolved()) { {code}
Especially when DN is connected to NN, BPServiceActor#bpNamenode is only
initialized once, which causes DN to never connect to NN before restarting.
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