| /** |
| * 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.io.IOException; |
| import java.util.List; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.hbase.client.TableDescriptor; |
| import org.apache.hadoop.hbase.client.TableDescriptorBuilder; |
| |
| /** |
| * Split size is the number of regions that are on this server that all are |
| * of the same table, cubed, times 2x the region flush size OR the maximum |
| * region split size, whichever is smaller. |
| * <p> |
| * For example, if the flush size is 128MB, then after two flushes (256MB) we |
| * will split which will make two regions that will split when their size is |
| * {@code 2^3 * 128MB*2 = 2048MB}. |
| * <p> |
| * If one of these regions splits, then there are three regions and now the |
| * split size is {@code 3^3 * 128MB*2 = 6912MB}, and so on until we reach the configured |
| * maximum file size and then from there on out, we'll use that. |
| */ |
| @InterfaceAudience.Private |
| public class IncreasingToUpperBoundRegionSplitPolicy extends ConstantSizeRegionSplitPolicy { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(IncreasingToUpperBoundRegionSplitPolicy.class); |
| |
| protected long initialSize; |
| |
| @Override |
| protected void configureForRegion(HRegion region) { |
| super.configureForRegion(region); |
| Configuration conf = getConf(); |
| initialSize = conf.getLong("hbase.increasing.policy.initial.size", -1); |
| if (initialSize > 0) { |
| return; |
| } |
| TableDescriptor desc = region.getTableDescriptor(); |
| if (desc != null) { |
| initialSize = 2 * desc.getMemStoreFlushSize(); |
| } |
| if (initialSize <= 0) { |
| initialSize = 2 * conf.getLong(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, |
| TableDescriptorBuilder.DEFAULT_MEMSTORE_FLUSH_SIZE); |
| } |
| } |
| |
| @Override |
| protected boolean shouldSplit() { |
| if (!canSplit()) { |
| return false; |
| } |
| // Get count of regions that have the same common table as this.region |
| int tableRegionsCount = getCountOfCommonTableRegions(); |
| // Get size to check |
| long sizeToCheck = getSizeToCheck(tableRegionsCount); |
| boolean shouldSplit = isExceedSize(sizeToCheck); |
| if (shouldSplit) { |
| LOG.debug("regionsWithCommonTable={}", tableRegionsCount); |
| } |
| return shouldSplit; |
| } |
| |
| /** |
| * @return Count of regions on this server that share the table this.region |
| * belongs to |
| */ |
| private int getCountOfCommonTableRegions() { |
| RegionServerServices rss = region.getRegionServerServices(); |
| // Can be null in tests |
| if (rss == null) { |
| return 0; |
| } |
| TableName tablename = region.getTableDescriptor().getTableName(); |
| int tableRegionsCount = 0; |
| try { |
| List<? extends Region> hri = rss.getRegions(tablename); |
| tableRegionsCount = hri == null || hri.isEmpty() ? 0 : hri.size(); |
| } catch (IOException e) { |
| LOG.debug("Failed getOnlineRegions " + tablename, e); |
| } |
| return tableRegionsCount; |
| } |
| |
| /** |
| * @return Region max size or {@code count of regions cubed * 2 * flushsize}, |
| * which ever is smaller; guard against there being zero regions on this server. |
| */ |
| protected long getSizeToCheck(final int tableRegionsCount) { |
| // safety check for 100 to avoid numerical overflow in extreme cases |
| return tableRegionsCount == 0 || tableRegionsCount > 100 |
| ? getDesiredMaxFileSize() |
| : Math.min(getDesiredMaxFileSize(), |
| initialSize * tableRegionsCount * tableRegionsCount * tableRegionsCount); |
| } |
| |
| } |