| /* |
| * 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; |
| |
| import java.util.concurrent.ThreadLocalRandom; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HBaseInterfaceAudience; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.client.TableDescriptor; |
| import org.apache.hadoop.hbase.procedure2.util.StringUtils; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A {@link RegionSplitPolicy} implementation which splits a region |
| * as soon as any of its store files exceeds a maximum configurable |
| * size. |
| * <p> |
| * This is the default split policy. From 0.94.0 on the default split policy has |
| * changed to {@link IncreasingToUpperBoundRegionSplitPolicy} |
| * </p> |
| */ |
| @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG) |
| public class ConstantSizeRegionSplitPolicy extends RegionSplitPolicy { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(ConstantSizeRegionSplitPolicy.class); |
| private long desiredMaxFileSize; |
| private double jitterRate; |
| protected boolean overallHRegionFiles; |
| |
| @Override |
| public String toString() { |
| return "ConstantSizeRegionSplitPolicy{" + "desiredMaxFileSize=" + desiredMaxFileSize |
| + ", jitterRate=" + jitterRate + '}'; |
| } |
| |
| @Override |
| protected void configureForRegion(HRegion region) { |
| super.configureForRegion(region); |
| Configuration conf = getConf(); |
| TableDescriptor desc = region.getTableDescriptor(); |
| if (desc != null) { |
| this.desiredMaxFileSize = desc.getMaxFileSize(); |
| } |
| if (this.desiredMaxFileSize <= 0) { |
| this.desiredMaxFileSize = conf.getLong(HConstants.HREGION_MAX_FILESIZE, |
| HConstants.DEFAULT_MAX_FILE_SIZE); |
| } |
| this.overallHRegionFiles = conf.getBoolean(HConstants.OVERALL_HREGION_FILES, |
| HConstants.DEFAULT_OVERALL_HREGION_FILES); |
| double jitter = conf.getDouble("hbase.hregion.max.filesize.jitter", 0.25D); |
| this.jitterRate = (ThreadLocalRandom.current().nextFloat() - 0.5D) * jitter; |
| long jitterValue = (long) (this.desiredMaxFileSize * this.jitterRate); |
| // Default jitter is ~12% +/-. Make sure the long value won't overflow with jitter |
| if (this.jitterRate > 0 && jitterValue > (Long.MAX_VALUE - this.desiredMaxFileSize)) { |
| this.desiredMaxFileSize = Long.MAX_VALUE; |
| } else { |
| this.desiredMaxFileSize += jitterValue; |
| } |
| } |
| |
| @Override |
| protected boolean shouldSplit() { |
| if (!canSplit()) { |
| return false; |
| } |
| return isExceedSize(desiredMaxFileSize); |
| } |
| |
| long getDesiredMaxFileSize() { |
| return desiredMaxFileSize; |
| } |
| |
| @InterfaceAudience.Private |
| public boolean positiveJitterRate() { |
| return this.jitterRate > 0; |
| } |
| |
| /** |
| * @return true if region size exceed the sizeToCheck |
| */ |
| protected final boolean isExceedSize(long sizeToCheck) { |
| if (overallHRegionFiles) { |
| long sumSize = 0; |
| for (HStore store : region.getStores()) { |
| sumSize += store.getSize(); |
| } |
| if (sumSize > sizeToCheck) { |
| LOG.debug("ShouldSplit because region size is big enough " |
| + "sumSize={}, sizeToCheck={}", StringUtils.humanSize(sumSize), |
| StringUtils.humanSize(sizeToCheck)); |
| return true; |
| } |
| } else { |
| for (HStore store : region.getStores()) { |
| long size = store.getSize(); |
| if (size > sizeToCheck) { |
| LOG.debug("ShouldSplit because {} size={}, sizeToCheck={}{}", |
| store.getColumnFamilyName(), StringUtils.humanSize(size), |
| StringUtils.humanSize(sizeToCheck)); |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| } |