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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8307) Spurious DNS Queries from hdfs shell
Date Wed, 22 Feb 2017 19:35:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879047#comment-15879047
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Wei-Chiu Chuang commented on HDFS-8307:
---------------------------------------

If I understand the fix correctly, HDFS-9364 fixed the same issue, but it was not backported
in branch-2.7.

> 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
>            Assignee: Andres Perez
>            Priority: Trivial
>              Labels: ha
>             Fix For: 2.7.4
>
>         Attachments: HDFS-8307.001.patch, HDFS-8307-branch-2.7.patch
>
>
> 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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