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https://issues.apache.org/jira/browse/HDFS-17333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17805299#comment-17805299
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ASF GitHub Bot commented on HDFS-17333:
---------------------------------------

hadoop-yetus commented on PR #6430:
URL: https://github.com/apache/hadoop/pull/6430#issuecomment-1885771188

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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> DFSClient support lazy resolve host->ip.
> ----------------------------------------
>
>                 Key: HDFS-17333
>                 URL: https://issues.apache.org/jira/browse/HDFS-17333
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Jian Zhang
>            Assignee: Jian Zhang
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HDFS-17333.001.patch
>
>
> Currently, when dfsclient is started, it will resolve all hosts of all 
> namservices: 
>           at DFSUtilClient#getAddresses(conf, null, addressKey)
>           at AbstractNNFailoverProxyProvider#getProxyAddresses(URI uri, 
> String addressKey)
> If the current environment where the dfsClient is located causes resolution 
> of host->ip to be very slow, the existing logic will undoubtedly take a long 
> time when there are too many nameservices.
> Now, each dfsclient only needs the IPs of all namenodes of a certain 
> nameservice at most. A better situation is that if the namenode selected by 
> dfsclient for the first time can provide the required services normally, then 
> the client only needs to know the IP of this namenode. Therefore, it is not 
> necessary to resolve all namenodes of all nameservices in the configuration 
> file, when dfsclient is started.
> This patch supports lazy resolution of host->ip, which will only be resolved 
> when the host needs to be accessed.



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