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

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

Simbarashe Dzinamarira created HDFS-17027:
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             Summary: 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


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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