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 org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
021import org.apache.yetus.audience.InterfaceAudience;
022
023@InterfaceAudience.Private
024public final class ReplicationOffsetUtil {
025
026  private ReplicationOffsetUtil() {
027  }
028
029  public static boolean shouldReplicate(ReplicationGroupOffset offset, String wal) {
030    // if no offset or the offset is just a place marker, replicate
031    if (offset == null || offset == ReplicationGroupOffset.BEGIN) {
032      return true;
033    }
034    // otherwise, compare the timestamp
035    long walTs = AbstractFSWALProvider.getTimestamp(wal);
036    long startWalTs = AbstractFSWALProvider.getTimestamp(offset.getWal());
037    if (walTs < startWalTs) {
038      return false;
039    } else if (walTs > startWalTs) {
040      return true;
041    }
042    // if the timestamp equals, usually it means we should include this wal but there is a special
043    // case, a negative offset means the wal has already been fully replicated, so here we should
044    // check the offset.
045    return offset.getOffset() >= 0;
046  }
047}