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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9364) Unnecessary DNS resolution attempts when creating NameNodeProxies
Date Tue, 10 Nov 2015 04:49:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997953#comment-14997953
] 

Xiao Chen commented on HDFS-9364:
---------------------------------

Thanks Zhe.
The findbugs and asflicense warnings are not introduced by this patch.
The test failures seems not related and passed locally. ({{TestRequestHedgingProxyProvider#testHedgingWhenOneFails}}
appears to be failing for both jdk7 and jdk8, but looks unrelated and passed locally.)
The javac warning is expected, see original comment [here|https://issues.apache.org/jira/browse/HADOOP-9150?focusedCommentId=13547479&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13547479].

> 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
>          Components: ha, performance
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-9364.001.patch, HDFS-9364.002.patch, HDFS-9364.003.patch, HDFS-9364.004.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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