bharathv 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_r374255049
 
 

 ##########
 File path: 
hbase-server/src/test/java/org/apache/hadoop/hbase/security/provider/TestCustomSaslAuthenticationProvider.java
 ##########
 @@ -443,9 +464,23 @@ public static void setupCluster() throws Exception {
         InMemoryServerProvider.class.getName());
     CONF.set(SaslClientAuthenticationProviders.SELECTOR_KEY,
         InMemoryProviderSelector.class.getName());
+    createBaseCluster(UTIL, KEYTAB_FILE, kdc);
+  }
 
-    CLUSTER = createCluster(UTIL, KEYTAB_FILE, kdc);
+  @Before
+  public void setUpBeforeTest() throws Exception {
+    CONF.unset(HConstants.CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY);
+    CONF.set(RpcClientFactory.CUSTOM_RPC_CLIENT_IMPL_CONF_KEY, rpcClientImpl);
+    CONF.set(RpcServerFactory.CUSTOM_RPC_SERVER_IMPL_CONF_KEY, rpcServerImpl);
+    if (rpcClientImpl.equals(BlockingRpcClient.class.getName())) {
+      // Set the connection registry to ZKConnectionRegistry since hedging is 
not supported on
+      // blocking rpc clients.
+      CONF.set(HConstants.CLIENT_CONNECTION_REGISTRY_IMPL_CONF_KEY,
+          HConstants.ZK_CONNECTION_REGISTRY_CLASS);
+    }
+    CLUSTER = new LocalHBaseCluster(CONF, 1);
 
 Review comment:
   Ya, unfortunately its the same problem, JUnit calls the ctor for every 
parameterized test invocation. So we'd need to have some logic like 
   
   if (same instance of params) don't restart
   
   We did that in TestFromClientSide but the code becomes ugly. Lucikly, there 
are fewer tests, so this works out ok here.

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