ndimiduk commented on a change in pull request #1102: HBASE-23752: Fix 
remaining test failures from nightly runs
URL: https://github.com/apache/hbase/pull/1102#discussion_r372515033
 
 

 ##########
 File path: 
hbase-server/src/test/java/org/apache/hadoop/hbase/security/provider/TestCustomSaslAuthenticationProvider.java
 ##########
 @@ -431,9 +431,13 @@ public static void setupCluster() throws Exception {
         UTIL.getDataTestDir("keytab").toUri().getPath());
     final MiniKdc kdc = UTIL.setupMiniKdc(KEYTAB_FILE);
 
-    // Switch back to NIO for now.
+    // Switch to blocking RPC impl.
     CONF.set(RpcClientFactory.CUSTOM_RPC_CLIENT_IMPL_CONF_KEY, 
BlockingRpcClient.class.getName());
     CONF.set(RpcServerFactory.CUSTOM_RPC_SERVER_IMPL_CONF_KEY, 
SimpleRpcServer.class.getName());
+    // Set the connection registry to ZKConnectionRegistry since hedging is 
not supported on
+    // blocking rpc clients.
 
 Review comment:
   1. Why is this test forced onto the blocking rpc client? Can/Should it be 
parameterized over both implementations?
   1. can we not use the `MasterRegistry` with hedged rpcs disabled? It appears 
this configuration is supported by the `MasterRegistry` constructor.

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