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Posted to hdfs-dev@hadoop.apache.org by "Owen O'Malley (Jira)" <ji...@apache.org> on 2022/11/29 00:52:00 UTC
[jira] [Resolved] (HDFS-16845) Add configuration flag to enable observer reads on routers without using ObserverReadProxyProvider
[ https://issues.apache.org/jira/browse/HDFS-16845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Owen O'Malley resolved HDFS-16845.
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Fix Version/s: 3.4.0
3.3.5
2.10.3
Resolution: Fixed
I just committed this. Thanks, Simba!
> 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
> Fix For: 3.4.0, 3.3.5, 2.10.3
>
>
> 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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