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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