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.wal; 019 020import org.apache.yetus.audience.InterfaceAudience; 021 022/** 023 * Used for {@link BoundedRecoveredEditsOutputSink}. The core part of limiting opening writers is it 024 * doesn't return chunk only if the heap size is over maxHeapUsage. Thus it doesn't need to create 025 * a writer for each region during splitting. The returned {@link EntryBuffers.RegionEntryBuffer} 026 * will be write to recovered edits file and close the writer immediately. 027 * See {@link BoundedRecoveredEditsOutputSink#append(EntryBuffers.RegionEntryBuffer)} for more 028 * details. 029 */ 030@InterfaceAudience.Private 031public class BoundedEntryBuffers extends EntryBuffers { 032 033 public BoundedEntryBuffers(WALSplitter.PipelineController controller, long maxHeapUsage) { 034 super(controller, maxHeapUsage); 035 } 036 037 @Override 038 synchronized RegionEntryBuffer getChunkToWrite() { 039 if (totalBuffered < maxHeapUsage) { 040 return null; 041 } 042 return super.getChunkToWrite(); 043 } 044}