From 26e6c2ceb4db80e561ec321dba52673e7f285d1b Mon Sep 17 00:00:00 2001
From: Apekshit Sharma <appy@apache.org>
Date: Thu, 17 Aug 2017 20:59:35 -0700
Subject: [PATCH] HBASE-17442 Move most of the replication related classes from
 hbase-client to new hbase-replication package. (Guanghao Zhang).

Change-Id: Ie0e24cc617ab4bf56de8b1747062d1b78a5d4669
---
 .../client/replication/ReplicationAdmin.java  | 102 +------
 .../apache/hadoop/hbase/zookeeper/ZKUtil.java |  14 +-
 .../hadoop/hbase/zookeeper/ZNodePaths.java    |  22 +-
 hbase-replication/pom.xml                     | 264 ++++++++++++++++++
 .../hbase/replication/ReplicationFactory.java |   0
 .../replication/ReplicationListener.java      |   0
 .../hbase/replication/ReplicationPeer.java    |   0
 .../ReplicationPeerConfigListener.java        |   0
 .../replication/ReplicationPeerZKImpl.java    |   0
 .../hbase/replication/ReplicationPeers.java   |   0
 .../replication/ReplicationPeersZKImpl.java   |   0
 .../replication/ReplicationQueueInfo.java     |   0
 .../hbase/replication/ReplicationQueues.java  |   0
 .../ReplicationQueuesArguments.java           |   0
 .../replication/ReplicationQueuesClient.java  |   0
 .../ReplicationQueuesClientArguments.java     |   0
 .../ReplicationQueuesClientZKImpl.java        |   0
 .../replication/ReplicationQueuesZKImpl.java  |   0
 .../replication/ReplicationStateZKBase.java   |   0
 .../replication/ReplicationTableBase.java     |   0
 .../hbase/replication/ReplicationTracker.java |   0
 .../replication/ReplicationTrackerZKImpl.java |   0
 ...TableBasedReplicationQueuesClientImpl.java |   0
 .../TableBasedReplicationQueuesImpl.java      |   0
 hbase-server/pom.xml                          |   4 +
 .../replication/BaseReplicationEndpoint.java  |   2 -
 pom.xml                                       |   6 +
 27 files changed, 301 insertions(+), 113 deletions(-)
 create mode 100644 hbase-replication/pom.xml
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationFactory.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationListener.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerConfigListener.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerZKImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeers.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeersZKImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueues.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesArguments.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClient.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientArguments.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientZKImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesZKImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateZKBase.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTableBase.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTracker.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTrackerZKImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesClientImpl.java (100%)
 rename {hbase-client => hbase-replication}/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesImpl.java (100%)

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
index 752d18c2ff9..615a79d3747 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/replication/ReplicationAdmin.java
@@ -26,37 +26,22 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Set;
 import java.util.TreeMap;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hbase.Abortable;
-import org.apache.hadoop.hbase.HColumnDescriptor;
 import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.HTableDescriptor;
 import org.apache.hadoop.hbase.ReplicationPeerNotFoundException;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.TableNotFoundException;
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
 import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
-import org.apache.hadoop.hbase.client.HBaseAdmin;
-import org.apache.hadoop.hbase.client.RegionLocator;
 import org.apache.hadoop.hbase.replication.ReplicationException;
-import org.apache.hadoop.hbase.replication.ReplicationFactory;
-import org.apache.hadoop.hbase.replication.ReplicationPeer;
 import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
 import org.apache.hadoop.hbase.replication.ReplicationPeerDescription;
-import org.apache.hadoop.hbase.replication.ReplicationPeerZKImpl;
-import org.apache.hadoop.hbase.replication.ReplicationPeers;
-import org.apache.hadoop.hbase.replication.ReplicationQueuesClient;
-import org.apache.hadoop.hbase.replication.ReplicationQueuesClientArguments;
-import org.apache.hadoop.hbase.util.Pair;
-import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
 
 import org.apache.hadoop.hbase.shaded.com.google.common.annotations.VisibleForTesting;
 import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;
@@ -101,16 +86,6 @@ public class ReplicationAdmin implements Closeable {
       Integer.toString(HConstants.REPLICATION_SCOPE_SERIAL);
 
   private final Connection connection;
-  // TODO: replication should be managed by master. All the classes except ReplicationAdmin should
-  // be moved to hbase-server. Resolve it in HBASE-11392.
-  private final ReplicationQueuesClient replicationQueuesClient;
-  private final ReplicationPeers replicationPeers;
-  /**
-   * A watcher used by replicationPeers and replicationQueuesClient. Keep reference so can dispose
-   * on {@link #close()}.
-   */
-  private final ZooKeeperWatcher zkw;
-
   private Admin admin;
 
   /**
@@ -122,49 +97,6 @@ public class ReplicationAdmin implements Closeable {
   public ReplicationAdmin(Configuration conf) throws IOException {
     this.connection = ConnectionFactory.createConnection(conf);
     admin = connection.getAdmin();
-    try {
-      zkw = createZooKeeperWatcher();
-      try {
-        this.replicationQueuesClient =
-            ReplicationFactory.getReplicationQueuesClient(new ReplicationQueuesClientArguments(conf,
-            this.connection, zkw));
-        this.replicationQueuesClient.init();
-        this.replicationPeers = ReplicationFactory.getReplicationPeers(zkw, conf,
-          this.replicationQueuesClient, this.connection);
-        this.replicationPeers.init();
-      } catch (Exception exception) {
-        if (zkw != null) {
-          zkw.close();
-        }
-        throw exception;
-      }
-    } catch (Exception exception) {
-      connection.close();
-      if (exception instanceof IOException) {
-        throw (IOException) exception;
-      } else if (exception instanceof RuntimeException) {
-        throw (RuntimeException) exception;
-      } else {
-        throw new IOException("Error initializing the replication admin client.", exception);
-      }
-    }
-  }
-
-  private ZooKeeperWatcher createZooKeeperWatcher() throws IOException {
-    // This Abortable doesn't 'abort'... it just logs.
-    return new ZooKeeperWatcher(connection.getConfiguration(), "ReplicationAdmin", new Abortable() {
-      @Override
-      public void abort(String why, Throwable e) {
-        LOG.error(why, e);
-        // We used to call system.exit here but this script can be embedded by other programs that
-        // want to do replication stuff... so inappropriate calling System.exit. Just log for now.
-      }
-
-      @Override
-      public boolean isAborted() {
-        return false;
-      }
-    });
   }
 
   /**
@@ -452,9 +384,6 @@ public class ReplicationAdmin implements Closeable {
 
   @Override
   public void close() throws IOException {
-    if (this.zkw != null) {
-      this.zkw.close();
-    }
     if (this.connection != null) {
       this.connection.close();
     }
@@ -518,40 +447,13 @@ public class ReplicationAdmin implements Closeable {
     admin.disableTableReplication(tableName);
   }
 
-  @VisibleForTesting
-  @Deprecated
-  public void peerAdded(String id) throws ReplicationException {
-    this.replicationPeers.peerConnected(id);
-  }
-
   /**
    * @deprecated use {@link org.apache.hadoop.hbase.client.Admin#listReplicationPeers()} instead
    */
   @VisibleForTesting
   @Deprecated
-  List<ReplicationPeer> listReplicationPeers() throws IOException {
-    Map<String, ReplicationPeerConfig> peers = listPeerConfigs();
-    if (peers == null || peers.size() <= 0) {
-      return null;
-    }
-    List<ReplicationPeer> listOfPeers = new ArrayList<>(peers.size());
-    for (Entry<String, ReplicationPeerConfig> peerEntry : peers.entrySet()) {
-      String peerId = peerEntry.getKey();
-      try {
-        Pair<ReplicationPeerConfig, Configuration> pair = this.replicationPeers.getPeerConf(peerId);
-        Configuration peerConf = pair.getSecond();
-        ReplicationPeer peer = new ReplicationPeerZKImpl(zkw, pair.getSecond(),
-          peerId, pair.getFirst(), this.connection);
-        listOfPeers.add(peer);
-      } catch (ReplicationException e) {
-        LOG.warn("Failed to get valid replication peers. "
-            + "Error connecting to peer cluster with peerId=" + peerId + ". Error message="
-            + e.getMessage());
-        LOG.debug("Failure details to get valid replication peers.", e);
-        continue;
-      }
-    }
-    return listOfPeers;
+  List<ReplicationPeerDescription> listReplicationPeers() throws IOException {
+    return admin.listReplicationPeers();
   }
 
   /**
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
index dafe421bcd8..1de3652d65c 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
@@ -44,7 +44,6 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
 import org.apache.hadoop.hbase.exceptions.DeserializationException;
-import org.apache.hadoop.hbase.replication.ReplicationStateZKBase;
 import org.apache.hadoop.hbase.security.Superusers;
 import org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException;
 import org.apache.hadoop.hbase.shaded.com.google.protobuf.UnsafeByteOperations;
@@ -1772,23 +1771,18 @@ public class ZKUtil {
    */
   private static void getReplicationZnodesDump(ZooKeeperWatcher zkw, StringBuilder sb)
       throws KeeperException {
-    String replicationZNodeName = zkw.getConfiguration().get("zookeeper.znode.replication",
-      "replication");
-    String replicationZnode = joinZNode(zkw.znodePaths.baseZNode, replicationZNodeName);
+    String replicationZnode = zkw.znodePaths.replicationZNode;
     if (ZKUtil.checkExists(zkw, replicationZnode) == -1) return;
     // do a ls -r on this znode
     sb.append("\n").append(replicationZnode).append(": ");
     List<String> children = ZKUtil.listChildrenNoWatch(zkw, replicationZnode);
     for (String child : children) {
       String znode = joinZNode(replicationZnode, child);
-      if (child.equals(zkw.getConfiguration().get("zookeeper.znode.replication.peers", "peers"))) {
+      if (znode.equals(zkw.znodePaths.peersZNode)) {
         appendPeersZnodes(zkw, znode, sb);
-      } else if (child.equals(zkw.getConfiguration().
-          get("zookeeper.znode.replication.rs", "rs"))) {
+      } else if (znode.equals(zkw.znodePaths.queuesZNode)) {
         appendRSZnodes(zkw, znode, sb);
-      } else if (child.equals(zkw.getConfiguration().get(
-        ReplicationStateZKBase.ZOOKEEPER_ZNODE_REPLICATION_HFILE_REFS_KEY,
-        ReplicationStateZKBase.ZOOKEEPER_ZNODE_REPLICATION_HFILE_REFS_DEFAULT))) {
+      } else if (znode.equals(zkw.znodePaths.hfileRefsZNode)) {
         appendHFileRefsZnodes(zkw, znode, sb);
       }
     }
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZNodePaths.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZNodePaths.java
index 4c66b8f8153..5608eb5d2a8 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZNodePaths.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZNodePaths.java
@@ -79,6 +79,15 @@ public class ZNodePaths {
   // znode of indicating master maintenance mode
   public final String masterMaintZNode;
 
+  // znode containing all replication state.
+  public final String replicationZNode;
+  // znode containing a list of all remote slave (i.e. peer) clusters.
+  public final String peersZNode;
+  // znode containing all replication queues
+  public final String queuesZNode;
+  // znode containing queues of hfile references to be replicated
+  public final String hfileRefsZNode;
+
   public ZNodePaths(Configuration conf) {
     baseZNode = conf.get(ZOOKEEPER_ZNODE_PARENT, DEFAULT_ZOOKEEPER_ZNODE_PARENT);
     ImmutableMap.Builder<Integer, String> builder = ImmutableMap.builder();
@@ -113,6 +122,15 @@ public class ZNodePaths {
       conf.get("zookeeper.znode.namespace", "namespace"));
     masterMaintZNode = ZKUtil.joinZNode(baseZNode,
       conf.get("zookeeper.znode.masterMaintenance", "master-maintenance"));
+    replicationZNode =
+        ZKUtil.joinZNode(baseZNode, conf.get("zookeeper.znode.replication", "replication"));
+    peersZNode =
+        ZKUtil.joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.peers", "peers"));
+    queuesZNode =
+        ZKUtil.joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.rs", "rs"));
+    hfileRefsZNode =
+        ZKUtil.joinZNode(replicationZNode,
+          conf.get("zookeeper.znode.replication.hfile.refs", "hfile-refs"));
   }
 
   @Override
@@ -125,7 +143,9 @@ public class ZNodePaths {
         + ", balancerZNode=" + balancerZNode + ", regionNormalizerZNode=" + regionNormalizerZNode
         + ", switchZNode=" + switchZNode + ", tableLockZNode=" + tableLockZNode
         + ", recoveringRegionsZNode=" + recoveringRegionsZNode + ", namespaceZNode="
-        + namespaceZNode + ", masterMaintZNode=" + masterMaintZNode + "]";
+        + namespaceZNode + ", masterMaintZNode=" + masterMaintZNode + ", replicationZNode="
+        + replicationZNode + ", peersZNode=" + peersZNode + ", queuesZNode=" + queuesZNode
+        + ", hfileRefsZNode=" + hfileRefsZNode + "]";
   }
 
   /**
diff --git a/hbase-replication/pom.xml b/hbase-replication/pom.xml
new file mode 100644
index 00000000000..858e9fc1f80
--- /dev/null
+++ b/hbase-replication/pom.xml
@@ -0,0 +1,264 @@
+<?xml version="1.0"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <!--
+  /**
+   * Licensed to the Apache Software Foundation (ASF) under one
+   * or more contributor license agreements.  See the NOTICE file
+   * distributed with this work for additional information
+   * regarding copyright ownership.  The ASF licenses this file
+   * to you under the Apache License, Version 2.0 (the
+   * "License"); you may not use this file except in compliance
+   * with the License.  You may obtain a copy of the License at
+   *
+   *     http://www.apache.org/licenses/LICENSE-2.0
+   *
+   * Unless required by applicable law or agreed to in writing, software
+   * distributed under the License is distributed on an "AS IS" BASIS,
+   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   * See the License for the specific language governing permissions and
+   * limitations under the License.
+   */
+  -->
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <artifactId>hbase-build-configuration</artifactId>
+    <groupId>org.apache.hbase</groupId>
+    <version>3.0.0-SNAPSHOT</version>
+    <relativePath>..</relativePath>
+  </parent>
+  <artifactId>hbase-replication</artifactId>
+  <name>Apache HBase - Replication</name>
+  <description>HBase Replication Support</description>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-site-plugin</artifactId>
+        <configuration>
+          <skip>true</skip>
+        </configuration>
+      </plugin>
+      <plugin>
+        <!--Make it so assembly:single does nothing in here-->
+        <artifactId>maven-assembly-plugin</artifactId>
+        <configuration>
+          <skipAssembly>true</skipAssembly>
+        </configuration>
+      </plugin>
+      <plugin>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <!-- Always skip the second part executions, since we only run
+          simple unit tests in this module -->
+        <executions>
+          <execution>
+            <id>secondPartTestsExecution</id>
+            <phase>test</phase>
+            <goals>
+              <goal>test</goal>
+            </goals>
+            <configuration>
+              <skip>true</skip>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <!-- Make a jar and put the sources in the jar -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+      </plugin>
+    </plugins>
+    <pluginManagement>
+      <plugins>
+        <!--This plugin's configuration is used to store Eclipse m2e settings
+             only. It has no influence on the Maven build itself.-->
+        <plugin>
+          <groupId>org.eclipse.m2e</groupId>
+          <artifactId>lifecycle-mapping</artifactId>
+          <version>1.0.0</version>
+          <configuration>
+            <lifecycleMappingMetadata>
+              <pluginExecutions>
+                <pluginExecution>
+                  <pluginExecutionFilter>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <versionRange>[3.2,)</versionRange>
+                    <goals>
+                      <goal>compile</goal>
+                    </goals>
+                  </pluginExecutionFilter>
+                  <action>
+                    <ignore></ignore>
+                  </action>
+                </pluginExecution>
+              </pluginExecutions>
+            </lifecycleMappingMetadata>
+          </configuration>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+  <dependencies>
+    <!-- Intra-project dependencies -->
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-annotations</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>jdk.tools</groupId>
+          <artifactId>jdk.tools</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-annotations</artifactId>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-client</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-common</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-common</artifactId>
+      <type>test-jar</type>
+    </dependency>
+    <!-- General dependencies -->
+    <dependency>
+      <groupId>commons-codec</groupId>
+      <artifactId>commons-codec</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>commons-io</groupId>
+      <artifactId>commons-io</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>commons-lang</groupId>
+      <artifactId>commons-lang</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>commons-logging</groupId>
+      <artifactId>commons-logging</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>com.google.protobuf</groupId>
+      <artifactId>protobuf-java</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.zookeeper</groupId>
+      <artifactId>zookeeper</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>log4j</groupId>
+      <artifactId>log4j</artifactId>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <profiles>
+    <!-- profile against Hadoop 2.x: This is the default. -->
+    <profile>
+      <id>hadoop-2.0</id>
+      <activation>
+        <property>
+            <!--Below formatting for dev-support/generate-hadoopX-poms.sh-->
+            <!--h2--><name>!hadoop.profile</name>
+        </property>
+      </activation>
+      <dependencies>
+        <dependency>
+           <groupId>com.github.stephenc.findbugs</groupId>
+           <artifactId>findbugs-annotations</artifactId>
+           <optional>true</optional>
+        </dependency>
+        <dependency>
+          <groupId>org.apache.hadoop</groupId>
+          <artifactId>hadoop-auth</artifactId>
+        </dependency>
+        <dependency>
+          <groupId>org.apache.hadoop</groupId>
+          <artifactId>hadoop-common</artifactId>
+          <exclusions>
+            <exclusion>
+              <groupId>net.java.dev.jets3t</groupId>
+              <artifactId>jets3t</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>javax.servlet.jsp</groupId>
+              <artifactId>jsp-api</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>org.mortbay.jetty</groupId>
+              <artifactId>jetty</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.sun.jersey</groupId>
+              <artifactId>jersey-server</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.sun.jersey</groupId>
+              <artifactId>jersey-core</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.sun.jersey</groupId>
+              <artifactId>jersey-json</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>javax.servlet</groupId>
+              <artifactId>servlet-api</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>tomcat</groupId>
+              <artifactId>jasper-compiler</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>tomcat</groupId>
+              <artifactId>jasper-runtime</artifactId>
+            </exclusion>
+            <exclusion>
+              <groupId>com.google.code.findbugs</groupId>
+              <artifactId>jsr305</artifactId>
+            </exclusion>
+          </exclusions>
+        </dependency>
+      </dependencies>
+    </profile>
+
+    <!--
+      profile for building against Hadoop 3.0.x. Activate using:
+       mvn -Dhadoop.profile=3.0
+    -->
+    <profile>
+      <id>hadoop-3.0</id>
+      <activation>
+        <property>
+          <name>hadoop.profile</name>
+          <value>3.0</value>
+        </property>
+      </activation>
+      <properties>
+        <hadoop.version>3.0-SNAPSHOT</hadoop.version>
+      </properties>
+      <dependencies>
+        <dependency>
+          <groupId>org.apache.hadoop</groupId>
+          <artifactId>hadoop-auth</artifactId>
+        </dependency>
+        <dependency>
+          <groupId>org.apache.hadoop</groupId>
+          <artifactId>hadoop-common</artifactId>
+        </dependency>
+      </dependencies>
+    </profile>
+  </profiles>
+</project>
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationFactory.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationFactory.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationFactory.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationFactory.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationListener.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationListener.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationListener.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationListener.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeer.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerConfigListener.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerConfigListener.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerConfigListener.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerConfigListener.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerZKImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerZKImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerZKImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeerZKImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeers.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeers.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeers.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeers.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeersZKImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeersZKImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeersZKImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationPeersZKImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueueInfo.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueues.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueues.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueues.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueues.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesArguments.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesArguments.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesArguments.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesArguments.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClient.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClient.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClient.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClient.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientArguments.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientArguments.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientArguments.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientArguments.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientZKImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientZKImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientZKImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesClientZKImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesZKImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesZKImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesZKImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationQueuesZKImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateZKBase.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateZKBase.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateZKBase.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationStateZKBase.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTableBase.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTableBase.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTableBase.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTableBase.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTracker.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTracker.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTracker.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTracker.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTrackerZKImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTrackerZKImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTrackerZKImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationTrackerZKImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesClientImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesClientImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesClientImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesClientImpl.java
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesImpl.java b/hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesImpl.java
similarity index 100%
rename from hbase-client/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesImpl.java
rename to hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/TableBasedReplicationQueuesImpl.java
diff --git a/hbase-server/pom.xml b/hbase-server/pom.xml
index 890ba2b680d..e1ef88234f0 100644
--- a/hbase-server/pom.xml
+++ b/hbase-server/pom.xml
@@ -376,6 +376,10 @@
       <groupId>org.apache.hbase</groupId>
       <artifactId>hbase-client</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-replication</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.hbase</groupId>
       <artifactId>hbase-prefix-tree</artifactId>
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/BaseReplicationEndpoint.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/BaseReplicationEndpoint.java
index 0e619ea4d04..ae4e7ccb45b 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/BaseReplicationEndpoint.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/BaseReplicationEndpoint.java
@@ -27,8 +27,6 @@ import org.apache.hadoop.hbase.classification.InterfaceAudience;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.hadoop.hbase.shaded.com.google.common.collect.Lists;
 import org.apache.hadoop.hbase.shaded.com.google.common.util.concurrent.AbstractService;
-import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener;
-
 /**
  * A Base implementation for {@link ReplicationEndpoint}s. Users should consider extending this
  * class rather than implementing {@link ReplicationEndpoint} directly for better backwards
diff --git a/pom.xml b/pom.xml
index 31ef24154c8..4d10324480a 100755
--- a/pom.xml
+++ b/pom.xml
@@ -63,6 +63,7 @@
   <modules>
     <module>hbase-build-support</module>
     <module>hbase-build-configuration</module>
+    <module>hbase-replication</module>
     <module>hbase-resource-bundle</module>
     <module>hbase-server</module>
     <module>hbase-thrift</module>
@@ -1603,6 +1604,11 @@
         <type>test-jar</type>
         <scope>test</scope>
       </dependency>
+      <dependency>
+        <artifactId>hbase-replication</artifactId>
+        <groupId>org.apache.hbase</groupId>
+        <version>${project.version}</version>
+      </dependency>
       <dependency>
         <artifactId>hbase-server</artifactId>
         <groupId>org.apache.hbase</groupId>