/* * 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 io.svectors.hbase.cdc; import static java.util.stream.Collectors.groupingBy; import java.io.IOException; import java.time.LocalDate; import java.util.List; import java.util.Map; import java.util.UUID; import io.svectors.hbase.cdc.config.KafkaConfiguration; import io.svectors.hbase.cdc.util.TopicNameFilter; import io.svectors.hbase.cdc.func.ToHRowFunction; import io.svectors.hbase.cdc.model.HRow; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; import org.apache.hadoop.hbase.CellUtil; import org.apache.hadoop.hbase.replication.BaseReplicationEndpoint; import org.apache.hadoop.hbase.wal.WAL.Entry; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * @author ravi.magham */ public class HbaseEndpoint extends BaseReplicationEndpoint { private static final Logger LOG = LoggerFactory.getLogger(HbaseEndpoint.class); private static final ToHRowFunction TO_HROW = new ToHRowFunction(); private KafkaMessageProducer producer; private TopicNameFilter topicNameFilter; public HbaseEndpoint() { super(); } @Override public void init(Context context) throws IOException { super.init(context); LOG.info("HbaseEndpoint init: "); } @Override public UUID getPeerUUID() { return UUID.randomUUID(); } /** * * @param context * @return */ @Override public boolean replicate(ReplicateContext context) { final List<Entry> entries = context.getEntries(); final Map<String, List<Entry>> entriesByTable = entries.stream() .filter(entry -> topicNameFilter.test(entry.getKey().getTablename().getNameAsString())) .collect(groupingBy(entry -> entry.getKey().getTablename().getNameAsString())); // persist the data to kafka in parallel. entriesByTable.entrySet().stream().forEach(entry -> { final String tableName = entry.getKey(); final List<Entry> tableEntries = entry.getValue(); tableEntries.forEach(tblEntry -> { List<Cell> cells = tblEntry.getEdit().getCells(); // group the data by the rowkey. Map<byte[], List<Cell>> columnsByRow = cells.stream() .collect(groupingBy(CellUtil::cloneRow)); // build the list of rows. columnsByRow.entrySet().stream().forEach(rowcols -> { final byte[] rowkey = rowcols.getKey(); final List<Cell> columns = rowcols.getValue(); final HRow row = TO_HROW.apply(rowkey, columns); producer.send(tableName, row); }); }); }); return true; } @Override protected void doStart() { LOG.info("Hbase replication to Kafka started at " + LocalDate.now()); final Configuration hdfsConfig = ctx.getConfiguration(); final KafkaConfiguration kafkaConfig = new KafkaConfiguration(hdfsConfig); topicNameFilter = new TopicNameFilter(kafkaConfig); producer = KafkaProducerFactory.getInstance(kafkaConfig); notifyStarted(); } @Override protected void doStop() { LOG.info("Hbase replication to Kafka stopped at " + LocalDate.now()); producer.close(); notifyStopped(); } }