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

["Simbarashe Dzinamarira (Jira)" <ji...@apache.org>]

Simbarashe Dzinamarira created HDFS-16845:
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             Summary: Add 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


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 namespace, so we'd like to avoid this.



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