[jira] [Updated] (HDFS-16845) Add configuration flag to enable observer reads on routers without using ObserverReadProxyProvider

["Shilun Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shilun Fan updated HDFS-16845:
------------------------------
          Component/s: configuration
         Hadoop Flags: Reviewed
     Target Version/s: 3.4.0
    Affects Version/s: 3.4.0

> 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
>          Components: configuration
>    Affects Versions: 3.4.0
>            Reporter: Simbarashe Dzinamarira
>            Assignee: Simbarashe Dzinamarira
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> 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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