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https://issues.apache.org/jira/browse/HDFS-16845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17638159#comment-17638159
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ASF GitHub Bot commented on HDFS-16845:
---------------------------------------

hadoop-yetus commented on PR #5142:
URL: https://github.com/apache/hadoop/pull/5142#issuecomment-1326085520

   :broken_heart: **-1 overall**
   
   
   
   
   
   
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[/results-checkstyle-hadoop-hdfs-project.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5142/6/artifact/out/results-checkstyle-hadoop-hdfs-project.txt)
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[/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5142/6/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt)
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   | Reason | Tests |
   |-------:|:------|
   | Failed junit tests | hadoop.hdfs.TestLeaseRecovery2 |
   
   
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https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5142/6/console |
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   This message was automatically generated.
   
   




> Add configuration flag to enable observer reads on routers without using 
> ObserverReadProxyProvider
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-16845
>                 URL: https://issues.apache.org/jira/browse/HDFS-16845
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Simbarashe Dzinamarira
>            Assignee: Simbarashe Dzinamarira
>            Priority: Critical
>              Labels: pull-request-available
>
> In order for clients to have routers forward their reads to observers, the 
> clients must use a proxy with an alignment context. This is currently 
> achieved by using the ObserverReadProxyProvider.
> Using ObserverReadProxyProvider allows backward compatible for client 
> configurations.
> However, the ObserverReadProxyProvider forces an msync on initialization 
> which is not required with routers.
> Performing msync calls is more expensive with routers because the router fans 
> out the cal to all namespaces, so we'd like to avoid this.



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