hfutatzhanghb opened a new pull request #3976:
URL: https://github.com/apache/hadoop/pull/3976
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### Description of PR
In current ObserverReadProxyProvider implementation, we use the following
code to invoke msync RPC.
```java
getProxyAsClientProtocol(failoverProxy.getProxy().proxy).msync();
```
But msync RPC maybe send to Observer NameNode in this way, and then failover
to Active NameNode. This can be avoid by applying this patch.
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