| /* |
| * 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.replication.regionserver; |
| |
| import java.util.Collections; |
| import org.apache.hadoop.hbase.wal.AbstractFSWALProvider; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * ReplicationSource that reads catalog WAL files -- e.g. hbase:meta WAL files -- and lets through |
| * all WALEdits from these WALs. This ReplicationSource is NOT created via |
| * {@link ReplicationSourceFactory}. |
| */ |
| @InterfaceAudience.Private |
| class CatalogReplicationSource extends ReplicationSource { |
| CatalogReplicationSource() { |
| // Filters in hbase:meta WAL files and allows all edits, including 'meta' edits (these are |
| // filtered out in the 'super' class default implementation). |
| super(p -> AbstractFSWALProvider.isMetaFile(p), Collections.emptyList()); |
| } |
| |
| @Override |
| public void logPositionAndCleanOldLogs(WALEntryBatch entryBatch) { |
| // Noop. This CatalogReplicationSource implementation does not persist state to backing storage |
| // nor does it keep its WALs in a general map up in ReplicationSourceManager -- |
| // CatalogReplicationSource is used by the Catalog Read Replica feature which resets everytime |
| // the WAL source process crashes. Skip calling through to the default implementation. |
| // See "4.1 Skip maintaining zookeeper replication queue (offsets/WALs)" in the |
| // design doc attached to HBASE-18070 'Enable memstore replication for meta replica for detail' |
| // for background on why no need to keep WAL state. |
| } |
| } |