[jira] [Resolved] (HDFS-17027) RBF: Add supports for observer.auto-msync-period when using routers

["Íñigo Goiri (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-17027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Íñigo Goiri resolved HDFS-17027.
--------------------------------
    Fix Version/s: 3.4.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

> RBF: Add supports for observer.auto-msync-period when using routers
> -------------------------------------------------------------------
>
>                 Key: HDFS-17027
>                 URL: https://issues.apache.org/jira/browse/HDFS-17027
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Simbarashe Dzinamarira
>            Assignee: Simbarashe Dzinamarira
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>
> None-RBF clients that use observer reads have the option to set *dfs.client.failover.observer.auto-msync-period.<nameservice>* . This config makes the client automatically do an msync, allowing clients to use the observer reads feature without any code change.
> To use observer reads with RBF, clients set *dfs.client.rbf.observer.read.enable*. The way this flag is implemented does not allow clients to use the *auto-msync-period* config. So with RBF, clients either have to 
> # Not use observer reads
> # Use observer reads with the risk of stale reads
> # Make code changes to explicitly call msync.
> We should add support for *dfs.client.failover.observer.auto-msync-period.<nameservice>*. This can be done by adding a ProxyProvider, in a similar manner to the ObserverReadProxyProvider.



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