| /* |
| * |
| * 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 org.apache.hadoop.hbase.regionserver.wal; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.HRegionInfo; |
| import org.apache.hadoop.hbase.HTableDescriptor; |
| |
| /** |
| * Get notification of {@link FSHLog}/WAL log events. The invocations are inline |
| * so make sure your implementation is fast else you'll slow hbase. |
| */ |
| @InterfaceAudience.Private |
| public interface WALActionsListener { |
| |
| /** |
| * The WAL is going to be rolled. The oldPath can be null if this is |
| * the first log file from the regionserver. |
| * @param oldPath the path to the old hlog |
| * @param newPath the path to the new hlog |
| */ |
| void preLogRoll(Path oldPath, Path newPath) throws IOException; |
| |
| /** |
| * The WAL has been rolled. The oldPath can be null if this is |
| * the first log file from the regionserver. |
| * @param oldPath the path to the old hlog |
| * @param newPath the path to the new hlog |
| */ |
| void postLogRoll(Path oldPath, Path newPath) throws IOException; |
| |
| /** |
| * The WAL is going to be archived. |
| * @param oldPath the path to the old hlog |
| * @param newPath the path to the new hlog |
| */ |
| void preLogArchive(Path oldPath, Path newPath) throws IOException; |
| |
| /** |
| * The WAL has been archived. |
| * @param oldPath the path to the old hlog |
| * @param newPath the path to the new hlog |
| */ |
| void postLogArchive(Path oldPath, Path newPath) throws IOException; |
| |
| /** |
| * A request was made that the WAL be rolled. |
| * @param tooFewReplicas roll requested because of too few replicas if true |
| */ |
| void logRollRequested(boolean tooFewReplicas); |
| |
| /** |
| * The WAL is about to close. |
| */ |
| void logCloseRequested(); |
| |
| /** |
| * Called before each write. |
| * @param info |
| * @param logKey |
| * @param logEdit |
| */ |
| void visitLogEntryBeforeWrite( |
| HRegionInfo info, HLogKey logKey, WALEdit logEdit |
| ); |
| |
| /** |
| * |
| * @param htd |
| * @param logKey |
| * @param logEdit |
| */ |
| void visitLogEntryBeforeWrite( |
| HTableDescriptor htd, HLogKey logKey, WALEdit logEdit |
| ); |
| } |