HBASE-29081: Add HBase Read Replica Cluster feature

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/IncrementalBackupManager.java

@@ -28,6 +28,7 @@
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.PathFilter;
 import org.apache.hadoop.hbase.HConstants;
+import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.backup.util.BackupUtils;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore;
@@ -156,7 +157,7 @@ private List<String> getLogFilesForNewBackup(Map<String, Long> olderTimestamps,
         LOG.debug("currentLogFile: " + log.getPath().toString());
         if (AbstractFSWALProvider.isMetaFile(log.getPath())) {
           if (LOG.isDebugEnabled()) {
-            LOG.debug("Skip hbase:meta log file: " + log.getPath().getName());
+            LOG.debug("Skip {} log file: {}", TableName.META_TABLE_NAME, log.getPath().getName());
           }
           continue;
         }

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/master/BackupLogCleaner.java

@@ -204,6 +204,6 @@ private static boolean isHMasterWAL(Path path) {
     String fn = path.getName();
     return fn.startsWith(WALProcedureStore.LOG_PREFIX)
       || fn.endsWith(MasterRegionFactory.ARCHIVED_WAL_SUFFIX)
-      || path.toString().contains("/%s/".formatted(MasterRegionFactory.MASTER_STORE_DIR));
+      || path.toString().contains("/%s/".formatted(MasterRegionFactory.MASTER_REGION_DIR_NAME));
   }
 }

hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/SnapshotOfRegionAssignmentFromMeta.java

@@ -170,7 +170,8 @@ private void processMetaRecord(Result result) throws IOException {
    * Initialize the region assignment snapshot by scanning the hbase:meta table
    */
   public void initialize() throws IOException {
-    LOG.info("Start to scan the hbase:meta for the current region assignment " + "snappshot");
+    LOG.info("Start to scan {} for the current region assignment snapshot",
+      TableName.META_TABLE_NAME);
     // Scan hbase:meta to pick up user regions
     try (Table metaTable = connection.getTable(TableName.META_TABLE_NAME);
       ResultScanner scanner = metaTable.getScanner(HConstants.CATALOG_FAMILY)) {
@@ -187,7 +188,8 @@ public void initialize() throws IOException {
         }
       }
     }
-    LOG.info("Finished to scan the hbase:meta for the current region assignment" + "snapshot");
+    LOG.info("Finished scanning {} for the current region assignment snapshot",
+      TableName.META_TABLE_NAME);
   }
 
   private void addRegion(RegionInfo regionInfo) {

hbase-client/src/main/java/org/apache/hadoop/hbase/ActiveClusterSuffix.java

@@ -0,0 +1,142 @@
+/*
+ * 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.
+ */
+package org.apache.hadoop.hbase;
+
+import java.io.IOException;
+import java.util.Objects;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.exceptions.DeserializationException;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.yetus.audience.InterfaceAudience;
+
+import org.apache.hbase.thirdparty.com.google.common.base.Strings;
+
+import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.ActiveClusterSuffixProtos;
+
+/**
+ * The read-replica cluster id for this cluster. It is serialized to the filesystem and up into
+ * zookeeper. This is a container for the id. Also knows how to serialize and deserialize the
+ * cluster id.
+ */
+@InterfaceAudience.Private
+public class ActiveClusterSuffix implements ClusterIdFile {
+  private final String clusterId;
+  private final String suffix;
+
+  public static class Parser implements ClusterIdFileParser<ActiveClusterSuffix> {
+
+    @Override
+    public String getFileName() {
+      return HConstants.ACTIVE_CLUSTER_SUFFIX_FILE_NAME;
+    }
+
+    /**
+     * Parse the serialized representation of the {@link ActiveClusterSuffix}
+     * @param bytes A pb serialized {@link ActiveClusterSuffix} instance with pb magic prefix
+     * @return An instance of {@link ActiveClusterSuffix} made from <code>bytes</code>
+     * @see #toByteArray()
+     */
+    @Override
+    public ActiveClusterSuffix parseFrom(byte[] bytes) throws DeserializationException {
+      if (ProtobufUtil.isPBMagicPrefix(bytes)) {
+        int pblen = ProtobufUtil.lengthOfPBMagic();
+        ActiveClusterSuffixProtos.ActiveClusterSuffix.Builder builder =
+          ActiveClusterSuffixProtos.ActiveClusterSuffix.newBuilder();
+        ActiveClusterSuffixProtos.ActiveClusterSuffix cs = null;
+        try {
+          ProtobufUtil.mergeFrom(builder, bytes, pblen, bytes.length - pblen);
+          cs = builder.build();
+        } catch (IOException e) {
+          throw new DeserializationException(e);
+        }
+        return convert(cs);
+      } else {
+        // Presume it was written out this way, the old way.
+        return new ActiveClusterSuffix(Bytes.toString(bytes));
+      }
+    }
+
+    @Override
+    public ActiveClusterSuffix readString(String input) {
+      return new ActiveClusterSuffix(input);
+    }
+  }
+
+  public ActiveClusterSuffix(final String clusterId, final String suffix) {
+    this.clusterId = clusterId;
+    this.suffix = suffix;
+  }
+
+  public ActiveClusterSuffix(final String input) {
+    String[] parts = input.split(":", 2);
+    this.clusterId = parts[0];
+    if (parts.length > 1) {
+      this.suffix = parts[1];
+    } else {
+      this.suffix = "";
+    }
+  }
+
+  public static ActiveClusterSuffix parseFrom(byte[] bytes) throws DeserializationException {
+    return new Parser().parseFrom(bytes);
+  }
+
+  public static ActiveClusterSuffix fromConfig(Configuration conf, ClusterId clusterId) {
+    return new ActiveClusterSuffix(clusterId.toString(), conf
+      .get(HConstants.HBASE_META_TABLE_SUFFIX, HConstants.HBASE_META_TABLE_SUFFIX_DEFAULT_VALUE));
+  }
+
+  /** Returns The active cluster suffix serialized using pb w/ pb magic prefix */
+  public byte[] toByteArray() {
+    return ProtobufUtil.prependPBMagic(convert().toByteArray());
+  }
+
+  /** Returns A pb instance to represent this instance. */
+  public ActiveClusterSuffixProtos.ActiveClusterSuffix convert() {
+    return ActiveClusterSuffixProtos.ActiveClusterSuffix.newBuilder().setClusterId(clusterId)
+      .setSuffix(suffix).build();
+  }
+
+  /** Returns A {@link ActiveClusterSuffix} made from the passed in <code>cs</code> */
+  public static ActiveClusterSuffix
+    convert(final ActiveClusterSuffixProtos.ActiveClusterSuffix cs) {
+    return new ActiveClusterSuffix(cs.getClusterId(), cs.getSuffix());
+  }
+
+  /**
+   * @see java.lang.Object#toString()
+   */
+  @Override
+  public String toString() {
+    return String.format("%s:%s", this.clusterId,
+      Strings.isNullOrEmpty(this.suffix) ? "<blank>" : this.suffix);
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (o == null || getClass() != o.getClass()) return false;
+    ActiveClusterSuffix that = (ActiveClusterSuffix) o;
+    return Objects.equals(clusterId, that.clusterId) && Objects.equals(suffix, that.suffix);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(clusterId, suffix);
+  }
+}

hbase-client/src/main/java/org/apache/hadoop/hbase/ClusterId.java

@@ -31,9 +31,47 @@
  * is a container for the id. Also knows how to serialize and deserialize the cluster id.
  */
 @InterfaceAudience.Private
-public class ClusterId {
+public class ClusterId implements ClusterIdFile {
   private final String id;
 
+  public static class Parser implements ClusterIdFileParser<ClusterId> {
+
+    @Override
+    public String getFileName() {
+      return HConstants.CLUSTER_ID_FILE_NAME;
+    }
+
+    /**
+     * Parse the serialized representation of the {@link ClusterId}
+     * @param bytes A pb serialized {@link ClusterId} instance with pb magic prefix
+     * @return An instance of {@link ClusterId} made from <code>bytes</code>
+     * @see #toByteArray()
+     */
+    @Override
+    public ClusterId parseFrom(byte[] bytes) throws DeserializationException {
+      if (ProtobufUtil.isPBMagicPrefix(bytes)) {
+        int pblen = ProtobufUtil.lengthOfPBMagic();
+        ClusterIdProtos.ClusterId.Builder builder = ClusterIdProtos.ClusterId.newBuilder();
+        ClusterIdProtos.ClusterId cid = null;
+        try {
+          ProtobufUtil.mergeFrom(builder, bytes, pblen, bytes.length - pblen);
+          cid = builder.build();
+        } catch (IOException e) {
+          throw new DeserializationException(e);
+        }
+        return convert(cid);
+      } else {
+        // Presume it was written out this way, the old way.
+        return new ClusterId(Bytes.toString(bytes));
+      }
+    }
+
+    @Override
+    public ClusterId readString(String input) {
+      return new ClusterId(input);
+    }
+  }
+
   /**
    * New ClusterID. Generates a uniqueid.
    */
@@ -50,30 +88,6 @@ public byte[] toByteArray() {
     return ProtobufUtil.prependPBMagic(convert().toByteArray());
   }
 
-  /**
-   * Parse the serialized representation of the {@link ClusterId}
-   * @param bytes A pb serialized {@link ClusterId} instance with pb magic prefix
-   * @return An instance of {@link ClusterId} made from <code>bytes</code>
-   * @see #toByteArray()
-   */
-  public static ClusterId parseFrom(final byte[] bytes) throws DeserializationException {
-    if (ProtobufUtil.isPBMagicPrefix(bytes)) {
-      int pblen = ProtobufUtil.lengthOfPBMagic();
-      ClusterIdProtos.ClusterId.Builder builder = ClusterIdProtos.ClusterId.newBuilder();
-      ClusterIdProtos.ClusterId cid = null;
-      try {
-        ProtobufUtil.mergeFrom(builder, bytes, pblen, bytes.length - pblen);
-        cid = builder.build();
-      } catch (IOException e) {
-        throw new DeserializationException(e);
-      }
-      return convert(cid);
-    } else {
-      // Presume it was written out this way, the old way.
-      return new ClusterId(Bytes.toString(bytes));
-    }
-  }
-
   /** Returns A pb instance to represent this instance. */
   public ClusterIdProtos.ClusterId convert() {
     ClusterIdProtos.ClusterId.Builder builder = ClusterIdProtos.ClusterId.newBuilder();

hbase-client/src/main/java/org/apache/hadoop/hbase/ClusterIdFile.java

@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+package org.apache.hadoop.hbase;
+
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * Represents a cluster identification file on the master file system. e.g. Cluster ID = hbase.id
+ * Active read-replica cluster ID = active.cluster.suffix.id
+ */
+@InterfaceAudience.Private
+public interface ClusterIdFile {
+
+  /**
+   * Return file contents in a byte array.
+   */
+  byte[] toByteArray();
+
+}

hbase-client/src/main/java/org/apache/hadoop/hbase/ClusterIdFileParser.java

@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+package org.apache.hadoop.hbase;
+
+import org.apache.hadoop.hbase.exceptions.DeserializationException;
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * Generic parser interface for Cluster Id files.
+ * @see ClusterIdFile
+ */
+@InterfaceAudience.Private
+public interface ClusterIdFileParser<T> {
+
+  /**
+   * Get default file name of cluster id file.
+   */
+  String getFileName();
+
+  /**
+   * Parse cluster id data from byte representation.
+   * @param bytes the protobuf data
+   * @return the cluster id data object
+   */
+  T parseFrom(final byte[] bytes) throws DeserializationException;
+
+  /**
+   * Parser cluster id data from String representation.
+   * @param input the input string
+   * @return the cluster id data object
+   */
+  T readString(String input);
+}