001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.replication;
019
020import java.util.UUID;
021import org.apache.hadoop.hbase.Cell;
022import org.apache.hadoop.hbase.CellUtil;
023import org.apache.hadoop.hbase.wal.WAL;
024import org.apache.yetus.audience.InterfaceAudience;
025
026/**
027 * A dummy {@link ReplicationEndpoint} that replicates nothing.
028 * <p/>
029 * Mainly used by ITBLL to check whether all the entries in WAL files are fine, since for normal
030 * case, we will only read the WAL files when there are region servers crash and we need to split
031 * the log, but for replication we will read all the entries and pass them to the
032 * {@link ReplicationEndpoint}, so setting up a replication peer can help finding out whether there
033 * are broken entries in WAL files.
034 */
035@InterfaceAudience.Private
036public class VerifyWALEntriesReplicationEndpoint extends BaseReplicationEndpoint {
037
038  @Override
039  public boolean canReplicateToSameCluster() {
040    return true;
041  }
042
043  @Override
044  public UUID getPeerUUID() {
045    return ctx.getClusterId();
046  }
047
048  @Override
049  public WALEntryFilter getWALEntryfilter() {
050    return null;
051  }
052
053  private void checkCell(Cell cell) {
054    // check whether all the fields are fine
055    CellUtil.cloneRow(cell);
056    CellUtil.cloneFamily(cell);
057    CellUtil.cloneQualifier(cell);
058    CellUtil.cloneValue(cell);
059  }
060
061  @Override
062  public boolean replicate(ReplicateContext replicateContext) {
063    replicateContext.entries.stream().map(WAL.Entry::getEdit).flatMap(e -> e.getCells().stream())
064      .forEach(this::checkCell);
065    return true;
066  }
067
068  @Override
069  public void start() {
070    startAsync();
071  }
072
073  @Override
074  public void stop() {
075    stopAsync();
076  }
077
078  @Override
079  protected void doStart() {
080    notifyStarted();
081  }
082
083  @Override
084  protected void doStop() {
085    notifyStopped();
086  }
087}