Anu Engineer created HDFS-8307:
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Summary: Spurious DNS Queries from hdfs shell
Key: HDFS-8307
URL: https://issues.apache.org/jira/browse/HDFS-8307
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 2.7.1
Reporter: Anu Engineer
Priority: Trivial
With HA configured the hdfs shell (org.apache.hadoop.fs.FsShell) seems to issue
a DNS query for the cluster Name. if fs.defaultFS is set to hdfs://mycluster,
then the shell seems to issue a DNS query for mycluster.FQDN or mycluster.
since mycluster not a machine name DNS query always fails with
"DNS 85 Standard query response 0x2aeb No such name"
Repro Steps:
# Setup a HA cluster
# Log on to any node
# Run wireshark monitoring port 53 - "sudo tshark 'port 53'"
# Run "sudo -u hdfs hdfs dfs -ls /"
# You should be able to see DNS queries to mycluster.FQDN in wireshark
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