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https://issues.apache.org/jira/browse/HDFS-16845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simbarashe Dzinamarira updated HDFS-16845:
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Priority: Critical (was: Major)
> 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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