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https://issues.apache.org/jira/browse/HDFS-9364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989862#comment-14989862
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Xiao Chen commented on HDFS-9364:
---------------------------------
Thanks for the quick response [~andreina]. I initially meant a more 'wrong'
configuration (e.g. HA service, but no failoverproxyprovider is configured
etc.). But seems in this case a exception is thrown later in
{{buildTokenService}}, so I agree we don't need the check here. :)
{{noformat}}
java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice1
at
org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:406)
at
org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:166)
at
org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:118)
at
org.apache.hadoop.hdfs.TestDFSClientFailover.testCreateProxyDoesntDnsResolveLogicalURI(TestDFSClientFailover.java:321)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
Caused by: java.net.UnknownHostException: nameservice1
{{noformat}}
Uploaded patch 3 to reflex this.
> Unnecessary DNS resolution attempts when creating NameNodeProxies
> -----------------------------------------------------------------
>
> Key: HDFS-9364
> URL: https://issues.apache.org/jira/browse/HDFS-9364
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Attachments: HDFS-9364.001.patch, HDFS-9364.002.patch,
> HDFS-9364.003.patch
>
>
> When creating NameNodeProxies, we always try to DNS-resolve namenode URIs.
> This is unnecessary if the URI is logical, and may be significantly slow if
> the DNS is having problems.
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