com.google.cloud.bigtable.hbase1_x.replication.HbaseToCloudBigtableReplicationEndpoint Maven / Gradle / Ivy

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Library to enable one way replication from HBase to Cloud Bigtable.

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/*
 * Copyright 2022 Google LLC
 *
 * Licensed 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.
 */
// TODO reverse the package names for 1.x and 2.x to com.google.cloud.bigtable.replication.hbase1_x
package com.google.cloud.bigtable.hbase1_x.replication;

import com.google.cloud.bigtable.hbase.replication.CloudBigtableReplicator;
import com.google.cloud.bigtable.hbase.replication.adapters.BigtableWALEntry;
import com.google.cloud.bigtable.hbase1_x.replication.metrics.HBaseMetricsExporter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.hadoop.hbase.replication.BaseReplicationEndpoint;
import org.apache.hadoop.hbase.wal.WAL;

/**
 * Basic endpoint that listens to CDC from HBase 1.x and replicates to Cloud Bigtable.
 *
 * This class is only public for instantiation, and should not be subclassed.
 */
public class HbaseToCloudBigtableReplicationEndpoint extends BaseReplicationEndpoint {

  private final CloudBigtableReplicator cloudBigtableReplicator;
  private final HBaseMetricsExporter metricsExporter;

  public HbaseToCloudBigtableReplicationEndpoint() {
    cloudBigtableReplicator = new CloudBigtableReplicator();
    metricsExporter = HBaseMetricsExporter.create();
  }

  @Override
  protected synchronized void doStart() {
    metricsExporter.init(ctx);
    cloudBigtableReplicator.start(ctx.getConfiguration(), metricsExporter);
    notifyStarted();
  }

  @Override
  protected void doStop() {
    cloudBigtableReplicator.stop();
    notifyStopped();
  }

  @Override
  public UUID getPeerUUID() {
    return cloudBigtableReplicator.getPeerUUID();
  }

  @Override
  public boolean replicate(ReplicateContext replicateContext) {
    Map> walEntriesByTable = new HashMap<>();

    // TODO evaluate streams vs iterative loops by running micro benchmarks
    for (WAL.Entry wal : replicateContext.getEntries()) {
      String tableName = wal.getKey().getTablename().getNameAsString();
      BigtableWALEntry bigtableWALEntry =
          new BigtableWALEntry(wal.getKey().getWriteTime(), wal.getEdit().getCells(), tableName);

      if (!walEntriesByTable.containsKey(tableName)) {
        walEntriesByTable.put(tableName, new ArrayList<>());
      }

      walEntriesByTable.get(tableName).add(bigtableWALEntry);
    }
    return cloudBigtableReplicator.replicate(walEntriesByTable);
  }
}