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https://issues.apache.org/jira/browse/HIVE-13817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15295442#comment-15295442
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Vijay Singh commented on HIVE-13817:
------------------------------------
{panel:title=Test Setup for CNAME alias resolution to A record based on reverse
dns lookup
|borderStyle=dashed|borderColor=#ccd|titleBGColor=#F0D6C1|bgColor=#BBAFCE}
[ec2-user@ip-10-0-0-18 ~]$ nslookup testcnamerecord.gce.cloudera.com
Server: 10.0.0.11
Address: 10.0.0.11#53
testcnamerecord.gce.cloudera.com canonical name =
testarecord.gce.cloudera.com.
Name: testarecord.gce.cloudera.com
Address: 10.0.0.19
[ec2-user@ip-10-0-0-18 ~]$ java NSLookupFwd testcnamerecord.gce.cloudera.com
Host: testcnamerecord.gce.cloudera.com
Canonical HostName: testarecord.gce.cloudera.com
{panel}
Please find the code snippet for above app that successfully performs CNAME
alias to A record resolution based on reverse dns lookup.
{code:title= NSLookupFwd.java|borderStyle=solid}
[ec2-user@ip-10-0-0-18 ~]$ cat NSLookupFwd.java
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class NSLookupFwd
{
public String canonicalize(String host) {
String cname=null;
try {
cname = InetAddress.getByName(host).getCanonicalHostName();
System.out.println("Host: " +
host);
System.out.println("Canonical HostName: " +
cname);
} catch (UnknownHostException ex) {
Logger.getLogger(NSLookupFwd.class.getName()).log(Level.SEVERE, null, ex);
}
return cname;
}
public static void main(String[] args)
{
new NSLookupFwd().canonicalize(args[0]);
}
}
{code}
> Allow DNS CNAME ALIAS Resolution from apache hive beeline JDBC URL to allow
> for failover
> ----------------------------------------------------------------------------------------
>
> Key: HIVE-13817
> URL: https://issues.apache.org/jira/browse/HIVE-13817
> Project: Hive
> Issue Type: New Feature
> Components: Beeline
> Affects Versions: 1.2.1
> Reporter: Vijay Singh
> Attachments: HIVE-13817.1.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Currently, in case of BDR clusters, DNS CNAME alias based connections fail.
> As _HOST resolves to exact endpoint specified in connection string and that
> may not be intended SPN for kerberos based on reverse DNS lookup.
> Consequently this JIRA proposes that client specific setting be used to
> resolv _HOST from CNAME DNS alias to A record entry on the fly in beeline.
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