From c598a2f9e386a4c445a412b1fb3753c465c30e3a Mon Sep 17 00:00:00 2001
From: Duo Zhang <zhangdo@apache.org>
Date: Wed, 18 Aug 2021 11:55:49 +0800
Subject: [PATCH] HBASE-26172 Deprecated MasterRegistry

---
 .../hadoop/hbase/client/MasterRegistry.java   |  3 +-
 .../client/RegistryEndpointsRefresher.java    |  4 --
 .../hbase/client/RpcConnectionRegistry.java   |  2 +-
 .../TestRegistryEndpointsRefresher.java       | 16 ++---
 .../apache/hadoop/hbase/master/HMaster.java   | 17 +++--
 .../hbase/master/MasterRpcServices.java       | 65 +------------------
 .../hbase/regionserver/HRegionServer.java     | 16 +++--
 .../hbase/regionserver/RSRpcServices.java     | 39 +++++------
 .../master/TestSplitRegionWhileRSCrash.java   | 52 +++++++--------
 .../hbase/zookeeper/MasterAddressTracker.java |  2 +-
 10 files changed, 75 insertions(+), 141 deletions(-)
 rename {hbase-server => hbase-client}/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java (87%)

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/MasterRegistry.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/MasterRegistry.java
index 76477aac8773..af6eaa5e387e 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/MasterRegistry.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/MasterRegistry.java
@@ -49,8 +49,9 @@
  * {@link #MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY} to a value greater than {@code 1} will enable
  * it(the default value is {@link AbstractRpcBasedConnectionRegistry#HEDGED_REQS_FANOUT_DEFAULT}).
  * <p/>
- * TODO: Handle changes to the configuration dynamically without having to restart the client.
+ * @deprecated Since 2.5.0, will be removed in 4.0.0. Use {@link RpcConnectionRegistry} instead.
  */
+@Deprecated
 @InterfaceAudience.Private
 public class MasterRegistry extends AbstractRpcBasedConnectionRegistry {
 
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RegistryEndpointsRefresher.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RegistryEndpointsRefresher.java
index 7eb81b0883f3..6599b620eb2e 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RegistryEndpointsRefresher.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RegistryEndpointsRefresher.java
@@ -39,12 +39,8 @@ class RegistryEndpointsRefresher {
 
   private static final Logger LOG = LoggerFactory.getLogger(RegistryEndpointsRefresher.class);
 
-  public static final String PERIODIC_REFRESH_INTERVAL_SECS =
-    "hbase.client.rpc_registry.refresh_interval_secs";
   private static final int PERIODIC_REFRESH_INTERVAL_SECS_DEFAULT = 300;
 
-  public static final String MIN_SECS_BETWEEN_REFRESHES =
-    "hbase.client.rpc_registry.min_secs_between_refreshes";
   private static final int MIN_SECS_BETWEEN_REFRESHES_DEFAULT = 60;
 
   private final Thread thread;
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RpcConnectionRegistry.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RpcConnectionRegistry.java
index 0096bfc01712..bcd37b182b6b 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RpcConnectionRegistry.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/RpcConnectionRegistry.java
@@ -49,7 +49,7 @@
 public class RpcConnectionRegistry extends AbstractRpcBasedConnectionRegistry {
 
   /** Configuration key that controls the fan out of requests **/
-  public static final String HEDGED_REQS_FANOUT_KEY = "hbase.client.rpc_registry.hedged.fanout";
+  public static final String HEDGED_REQS_FANOUT_KEY = "hbase.client.bootstrap.hedged.fanout";
 
   public static final String PERIODIC_REFRESH_INTERVAL_SECS =
     "hbase.client.bootstrap.refresh_interval_secs";
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java b/hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java
similarity index 87%
rename from hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java
rename to hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java
index 1447099168f4..748ad41952a6 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java
+++ b/hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestRegistryEndpointsRefresher.java
@@ -52,13 +52,13 @@ public class TestRegistryEndpointsRefresher {
 
   private Configuration conf;
   private RegistryEndpointsRefresher refresher;
-  private AtomicInteger getMastersCallCounter;
+  private AtomicInteger refreshCallCounter;
   private CopyOnWriteArrayList<Long> callTimestamps;
 
   @Before
   public void setUp() {
     conf = HBaseConfiguration.create();
-    getMastersCallCounter = new AtomicInteger(0);
+    refreshCallCounter = new AtomicInteger(0);
     callTimestamps = new CopyOnWriteArrayList<>();
   }
 
@@ -70,7 +70,7 @@ public void tearDown() {
   }
 
   private void refresh() {
-    getMastersCallCounter.incrementAndGet();
+    refreshCallCounter.incrementAndGet();
     callTimestamps.add(EnvironmentEdgeManager.currentTime());
   }
 
@@ -86,8 +86,8 @@ private void createAndStartRefresher(long intervalSecs, long minIntervalSecs) {
   public void testPeriodicMasterEndPointRefresh() throws IOException {
     // Refresh every 1 second.
     createAndStartRefresher(1, 0);
-    // Wait for > 3 seconds to see that at least 3 getMasters() RPCs have been made.
-    Waiter.waitFor(conf, 5000, () -> getMastersCallCounter.get() > 3);
+    // Wait for > 3 seconds to see that at least 3 refresh have been made.
+    Waiter.waitFor(conf, 5000, () -> refreshCallCounter.get() > 3);
   }
 
   @Test
@@ -101,10 +101,10 @@ public void testDurationBetweenRefreshes() throws IOException {
       Uninterruptibles.sleepUninterruptibly(1, TimeUnit.MILLISECONDS);
     }
     // Overall wait time is 10000 ms, so the number of requests should be <=10
-    // Actual calls to getMasters() should be much lower than the refresh count.
-    assertTrue(String.valueOf(getMastersCallCounter.get()), getMastersCallCounter.get() <= 20);
+    // Actual calls to refresh should be much lower than the refresh count.
+    assertTrue(String.valueOf(refreshCallCounter.get()), refreshCallCounter.get() <= 20);
     assertTrue(callTimestamps.size() > 0);
-    // Verify that the delta between subsequent RPCs is at least 1sec as configured.
+    // Verify that the delta between subsequent refresh is at least 1sec as configured.
     for (int i = 1; i < callTimestamps.size() - 1; i++) {
       long delta = callTimestamps.get(i) - callTimestamps.get(i - 1);
       // Few ms cushion to account for any env jitter.
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
index c2ed0b6b31a2..db6cb8600735 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
@@ -2700,10 +2700,21 @@ public ClusterMetrics getClusterMetrics(EnumSet<Option> options) throws IOExcept
     return status;
   }
 
-  List<ServerName> getBackupMasters() {
+  @Override
+  public Optional<ServerName> getActiveMaster() {
+    return activeMasterManager.getActiveMasterServerName();
+  }
+
+  @Override
+  public List<ServerName> getBackupMasters() {
     return activeMasterManager.getBackupMasters();
   }
 
+  @Override
+  public List<ServerName> getRegionServers() {
+    return serverManager.getOnlineServersList();
+  }
+
   /**
    * The set of loaded coprocessors is stored in a static set. Since it's
    * statically allocated, it does not require that HMaster's cpHost be
@@ -3848,10 +3859,6 @@ public String getClusterId() {
     return cachedClusterId.getFromCacheOrFetch();
   }
 
-  public Optional<ServerName> getActiveMaster() {
-    return activeMasterManager.getActiveMasterServerName();
-  }
-
   @Override
   public void runReplicationBarrierCleaner() {
     ReplicationBarrierCleaner rbc = this.replicationBarrierCleaner;
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
index 9a55d1db935c..2a26fa0c6441 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
@@ -33,7 +33,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
-import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
 import org.apache.hadoop.conf.Configuration;
@@ -372,15 +371,6 @@
 import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.ClientMetaService;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetActiveMasterRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetActiveMasterResponse;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetBootstrapNodesRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetBootstrapNodesResponse;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetClusterIdRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetClusterIdResponse;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetMastersRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetMastersResponse;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegistryProtos.GetMastersResponseEntry;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.AddReplicationPeerRequest;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.AddReplicationPeerResponse;
 import org.apache.hadoop.hbase.shaded.protobuf.generated.ReplicationProtos.DisableReplicationPeerRequest;
@@ -408,8 +398,7 @@
 @SuppressWarnings("deprecation")
 public class MasterRpcServices extends RSRpcServices implements
     MasterService.BlockingInterface, RegionServerStatusService.BlockingInterface,
-    LockService.BlockingInterface, HbckService.BlockingInterface,
-    ClientMetaService.BlockingInterface {
+    LockService.BlockingInterface, HbckService.BlockingInterface {
 
   private static final Logger LOG = LoggerFactory.getLogger(MasterRpcServices.class.getName());
   private static final Logger AUDITLOG =
@@ -3003,58 +2992,6 @@ private boolean shouldSubmitSCP(ServerName serverName) {
     return true;
   }
 
-  // Override this method since for backup master we will not set the clusterId field, which means
-  // we need to find another way to get cluster id for backup masters.
-  @Override
-  public GetClusterIdResponse getClusterId(RpcController rpcController, GetClusterIdRequest request)
-    throws ServiceException {
-    GetClusterIdResponse.Builder resp = GetClusterIdResponse.newBuilder();
-    String clusterId = master.getClusterId();
-    if (clusterId != null) {
-      resp.setClusterId(clusterId);
-    }
-    return resp.build();
-  }
-
-  // Override this method since we use ActiveMasterManager to get active master on HMaster while in
-  // HRegionServer we use MasterAddressTracker
-  @Override
-  public GetActiveMasterResponse getActiveMaster(RpcController rpcController,
-    GetActiveMasterRequest request) throws ServiceException {
-    GetActiveMasterResponse.Builder resp = GetActiveMasterResponse.newBuilder();
-    Optional<ServerName> serverName = master.getActiveMaster();
-    serverName.ifPresent(name -> resp.setServerName(ProtobufUtil.toServerName(name)));
-    return resp.build();
-  }
-
-  // Override this method since we use ActiveMasterManager to get backup masters on HMaster while in
-  // HRegionServer we use MasterAddressTracker
-  @Override
-  public GetMastersResponse getMasters(RpcController rpcController, GetMastersRequest request)
-    throws ServiceException {
-    GetMastersResponse.Builder resp = GetMastersResponse.newBuilder();
-    // Active master
-    Optional<ServerName> serverName = master.getActiveMaster();
-    serverName.ifPresent(name -> resp.addMasterServers(GetMastersResponseEntry.newBuilder()
-      .setServerName(ProtobufUtil.toServerName(name)).setIsActive(true).build()));
-    // Backup masters
-    for (ServerName backupMaster : master.getBackupMasters()) {
-      resp.addMasterServers(GetMastersResponseEntry.newBuilder()
-        .setServerName(ProtobufUtil.toServerName(backupMaster)).setIsActive(false).build());
-    }
-    return resp.build();
-  }
-
-  @Override
-  public GetBootstrapNodesResponse getBootstrapNodes(RpcController controller,
-    GetBootstrapNodesRequest request) throws ServiceException {
-    GetBootstrapNodesResponse.Builder builder = GetBootstrapNodesResponse.newBuilder();
-    for (ServerName sn : master.getServerManager().getOnlineServers().keySet()) {
-      builder.addServerName(ProtobufUtil.toServerName(sn));
-    }
-    return builder.build();
-  }
-
   @Override
   public GetRSGroupInfoResponse getRSGroupInfo(RpcController controller,
     GetRSGroupInfoRequest request) throws ServiceException {
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
index d8a43d5279d6..90edff2bb90b 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
@@ -4007,11 +4007,19 @@ public long getRetryPauseTime() {
     return this.retryPauseTime;
   }
 
-  public MetaRegionLocationCache getMetaRegionLocationCache() {
-    return this.metaRegionLocationCache;
+  public Optional<ServerName> getActiveMaster() {
+    return Optional.ofNullable(masterAddressTracker.getMasterAddress());
+  }
+
+  public List<ServerName> getBackupMasters() {
+    return masterAddressTracker.getBackupMasters();
   }
 
-  RegionServerAddressTracker getRegionServerAddressTracker() {
-    return regionServerAddressTracker;
+  public List<ServerName> getRegionServers() {
+    return regionServerAddressTracker.getRegionServers();
+  }
+
+  public MetaRegionLocationCache getMetaRegionLocationCache() {
+    return this.metaRegionLocationCache;
   }
 }
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
index 56c53714bc47..9a2394a26c43 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
@@ -308,14 +308,14 @@ public class RSRpcServices implements HBaseRPCErrorHandler,
    */
   private static final long DEFAULT_REGION_SERVER_RPC_MINIMUM_SCAN_TIME_LIMIT_DELTA = 10;
 
-  /*
+  /**
    * Whether to reject rows with size > threshold defined by
    * {@link RSRpcServices#BATCH_ROWS_THRESHOLD_NAME}
    */
   private static final String REJECT_BATCH_ROWS_OVER_THRESHOLD =
     "hbase.rpc.rows.size.threshold.reject";
 
-  /*
+  /**
    * Default value of config {@link RSRpcServices#REJECT_BATCH_ROWS_OVER_THRESHOLD}
    */
   private static final boolean DEFAULT_REJECT_BATCH_ROWS_OVER_THRESHOLD = false;
@@ -4092,31 +4092,22 @@ public GetClusterIdResponse getClusterId(RpcController controller, GetClusterIdR
   public GetActiveMasterResponse getActiveMaster(RpcController controller,
     GetActiveMasterRequest request) throws ServiceException {
     GetActiveMasterResponse.Builder builder = GetActiveMasterResponse.newBuilder();
-    ServerName activeMaster = regionServer.getMasterAddressTracker().getMasterAddress();
-    if (activeMaster != null) {
-      builder.setServerName(ProtobufUtil.toServerName(activeMaster));
-    }
+    regionServer.getActiveMaster()
+      .ifPresent(name -> builder.setServerName(ProtobufUtil.toServerName(name)));
     return builder.build();
   }
 
   @Override
   public GetMastersResponse getMasters(RpcController controller, GetMastersRequest request)
     throws ServiceException {
-    try {
-      GetMastersResponse.Builder builder = GetMastersResponse.newBuilder();
-      ServerName activeMaster = regionServer.getMasterAddressTracker().getMasterAddress();
-      if (activeMaster != null) {
-        builder.addMasterServers(GetMastersResponseEntry.newBuilder()
-          .setServerName(ProtobufUtil.toServerName(activeMaster)).setIsActive(true));
-      }
-      for (ServerName backupMaster : regionServer.getMasterAddressTracker().getBackupMasters()) {
-        builder.addMasterServers(GetMastersResponseEntry.newBuilder()
-          .setServerName(ProtobufUtil.toServerName(backupMaster)).setIsActive(false));
-      }
-      return builder.build();
-    } catch (IOException e) {
-      throw new ServiceException(e);
-    }
+    GetMastersResponse.Builder builder = GetMastersResponse.newBuilder();
+    regionServer.getActiveMaster()
+      .ifPresent(activeMaster -> builder.addMasterServers(GetMastersResponseEntry.newBuilder()
+        .setServerName(ProtobufUtil.toServerName(activeMaster)).setIsActive(true)));
+    regionServer.getBackupMasters()
+      .forEach(backupMaster -> builder.addMasterServers(GetMastersResponseEntry.newBuilder()
+        .setServerName(ProtobufUtil.toServerName(backupMaster)).setIsActive(false)));
+    return builder.build();
   }
 
   @Override
@@ -4131,11 +4122,11 @@ public GetMetaRegionLocationsResponse getMetaRegionLocations(RpcController contr
   }
 
   @Override
-  public GetBootstrapNodesResponse getBootstrapNodes(RpcController controller,
+  public final GetBootstrapNodesResponse getBootstrapNodes(RpcController controller,
     GetBootstrapNodesRequest request) throws ServiceException {
     GetBootstrapNodesResponse.Builder builder = GetBootstrapNodesResponse.newBuilder();
-    regionServer.getRegionServerAddressTracker().getRegionServers().stream()
-      .map(ProtobufUtil::toServerName).forEach(builder::addServerName);
+    regionServer.getRegionServers().stream().map(ProtobufUtil::toServerName)
+      .forEach(builder::addServerName);
     return builder.build();
   }
 }
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestSplitRegionWhileRSCrash.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestSplitRegionWhileRSCrash.java
index 611951565ea7..22ba74c30adf 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestSplitRegionWhileRSCrash.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestSplitRegionWhileRSCrash.java
@@ -18,14 +18,12 @@
 package org.apache.hadoop.hbase.master;
 
 import java.util.List;
-import java.util.concurrent.CountDownLatch;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtil;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RegionInfo;
-import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.Table;
@@ -45,53 +43,50 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import org.apache.hbase.thirdparty.com.google.common.io.Closeables;
+
 @Category({MasterTests.class, MediumTests.class})
 public class TestSplitRegionWhileRSCrash {
 
   @ClassRule
   public static final HBaseClassTestRule CLASS_RULE =
-      HBaseClassTestRule.forClass(TestSplitRegionWhileRSCrash.class);
+    HBaseClassTestRule.forClass(TestSplitRegionWhileRSCrash.class);
 
-  private static final Logger LOG = LoggerFactory
-      .getLogger(TestSplitRegionWhileRSCrash.class);
+  private static final Logger LOG = LoggerFactory.getLogger(TestSplitRegionWhileRSCrash.class);
 
   protected static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
   private static TableName TABLE_NAME = TableName.valueOf("test");
-  private static Admin admin;
+  private static Admin ADMIN;
   private static byte[] CF = Bytes.toBytes("cf");
-  private static CountDownLatch mergeCommitArrive = new CountDownLatch(1);
   private static Table TABLE;
 
 
   @BeforeClass
   public static void setupCluster() throws Exception {
     UTIL.startMiniCluster(1);
-    admin = UTIL.getAdmin();
+    ADMIN = UTIL.getAdmin();
     TABLE = UTIL.createTable(TABLE_NAME, CF);
     UTIL.waitTableAvailable(TABLE_NAME);
   }
 
   @AfterClass
   public static void cleanupTest() throws Exception {
-    try {
-      UTIL.shutdownMiniCluster();
-    } catch (Exception e) {
-      LOG.warn("failure shutting down cluster", e);
-    }
+    Closeables.close(TABLE, true);
+    UTIL.shutdownMiniCluster();
   }
 
   @Test
   public void test() throws Exception {
-    MasterProcedureEnv env = UTIL.getMiniHBaseCluster().getMaster()
-        .getMasterProcedureExecutor().getEnvironment();
-    final ProcedureExecutor<MasterProcedureEnv> executor = UTIL.getMiniHBaseCluster()
-        .getMaster().getMasterProcedureExecutor();
-    List<RegionInfo> regionInfos = admin.getRegions(TABLE_NAME);
-    //Since a flush request will be sent while initializing SplitTableRegionProcedure
-    //Create SplitTableRegionProcedure first before put data
-    SplitTableRegionProcedure splitProcedure = new SplitTableRegionProcedure(
-        env, regionInfos.get(0), Bytes.toBytes("row5"));
-    //write some rows to the table
+    MasterProcedureEnv env =
+      UTIL.getMiniHBaseCluster().getMaster().getMasterProcedureExecutor().getEnvironment();
+    final ProcedureExecutor<MasterProcedureEnv> executor =
+      UTIL.getMiniHBaseCluster().getMaster().getMasterProcedureExecutor();
+    List<RegionInfo> regionInfos = ADMIN.getRegions(TABLE_NAME);
+    // Since a flush request will be sent while initializing SplitTableRegionProcedure
+    // Create SplitTableRegionProcedure first before put data
+    SplitTableRegionProcedure splitProcedure =
+      new SplitTableRegionProcedure(env, regionInfos.get(0), Bytes.toBytes("row5"));
+    // write some rows to the table
     LOG.info("Begin to put data");
     for (int i = 0; i < 10; i++) {
       byte[] row = Bytes.toBytes("row" + i);
@@ -101,19 +96,18 @@ public void test() throws Exception {
     }
     executor.submitProcedure(splitProcedure);
     LOG.info("SplitProcedure submitted");
-    UTIL.waitFor(30000, () -> executor.getProcedures().stream()
-        .filter(p -> p instanceof TransitRegionStateProcedure)
+    UTIL.waitFor(30000,
+      () -> executor.getProcedures().stream().filter(p -> p instanceof TransitRegionStateProcedure)
         .map(p -> (TransitRegionStateProcedure) p)
         .anyMatch(p -> TABLE_NAME.equals(p.getTableName())));
-    UTIL.getMiniHBaseCluster().killRegionServer(
-        UTIL.getMiniHBaseCluster().getRegionServer(0).getServerName());
+    UTIL.getMiniHBaseCluster()
+      .killRegionServer(UTIL.getMiniHBaseCluster().getRegionServer(0).getServerName());
     UTIL.getMiniHBaseCluster().startRegionServer();
     UTIL.waitUntilNoRegionsInTransition();
     Scan scan = new Scan();
     ResultScanner results = TABLE.getScanner(scan);
     int count = 0;
-    Result result = null;
-    while ((result = results.next()) != null) {
+    while (results.next() != null) {
       count++;
     }
     Assert.assertEquals("There should be 10 rows!", 10, count);
diff --git a/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterAddressTracker.java b/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterAddressTracker.java
index 748fb8b141b6..54385f81f75c 100644
--- a/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterAddressTracker.java
+++ b/hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/MasterAddressTracker.java
@@ -307,7 +307,7 @@ public static boolean deleteIfEquals(ZKWatcher zkw, final String content) {
     return false;
   }
 
-  public List<ServerName> getBackupMasters() throws InterruptedIOException {
+  public List<ServerName> getBackupMasters() {
     return backupMasters;
   }