1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.replication;
19
20 import org.apache.hadoop.hbase.Cell;
21 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
22 import org.apache.hadoop.hbase.classification.InterfaceAudience;
23 import org.apache.hadoop.hbase.wal.WAL.Entry;
24
25 /**
26 * A filter for WAL entry cells before being sent over to replication.
27 */
28 @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.REPLICATION)
29 public interface WALCellFilter {
30
31 /**
32 * Applies the filter, possibly returning a different Cell instance.
33 * If null is returned, the cell will be skipped.
34 * @param entry Entry which contains the cell
35 * @param cell Cell to filter
36 * @return a (possibly modified) Cell to use. Returning null will cause the cell
37 * to be skipped for replication.
38 */
39 public Cell filterCell(Entry entry, Cell cell);
40
41 }