zhangkun created HDFS-16295:
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Summary: datanode connect to namenode, datanode start can't
resolved dns, rpc always exception when Handshake
Key: HDFS-16295
URL: https://issues.apache.org/jira/browse/HDFS-16295
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.2.1
Reporter: zhangkun
hadoop on k8s
i use k8s statefulset start hdfs DataNode and NameNode。
when dataNode start ,if can't resolved NameNode host，InetSocketAddress is
unResolved。
Rpc request nameNode always throw unknowHostException
if after dataNode start, NameNode is started and Namenode is reachable,
DataNode also can't reconnect to namenode
hadoop version:3.2.1
（code:
org.apache.hadoop.hdfs.server.datanode.BPServiceActor.retrieveNamespaceInfo()
bpNamenode.versionRequest();
RPC：
org.apache.hadoop.ipc.Client.Connection
the constructed function of class Connnection will throw UnKnownHostExeception
）
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