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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8307) Spurious DNS Queries from hdfs shell
Date Thu, 30 Apr 2015 21:17:07 GMT
Anu Engineer created HDFS-8307:

             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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