saintstack commented on a change in pull request #978: HBASE-22285 A normalizer which merges small size regions with adjacen… URL: https://github.com/apache/hbase/pull/978#discussion_r362260193
########## File path: hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/BaseNormalizer.java ########## @@ -0,0 +1,214 @@ +/** + * + * 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.master.normalizer; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; +import org.apache.hadoop.hbase.RegionMetrics; +import org.apache.hadoop.hbase.ServerName; +import org.apache.hadoop.hbase.Size; +import org.apache.hadoop.hbase.TableName; +import org.apache.hadoop.hbase.client.MasterSwitchType; +import org.apache.hadoop.hbase.client.RegionInfo; +import org.apache.hadoop.hbase.client.TableDescriptor; +import org.apache.hadoop.hbase.master.MasterRpcServices; +import org.apache.hadoop.hbase.master.MasterServices; +import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter; +import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public abstract class BaseNormalizer implements RegionNormalizer { + private static final Logger LOG = LoggerFactory.getLogger(BaseNormalizer.class); + protected MasterServices masterServices; + protected MasterRpcServices masterRpcServices; + + /** + * Set the master service. + * @param masterServices inject instance of MasterServices + */ + @Override + public void setMasterServices(MasterServices masterServices) { + this.masterServices = masterServices; + } + + @Override + public void setMasterRpcServices(MasterRpcServices masterRpcServices) { + this.masterRpcServices = masterRpcServices; + } + + protected long getRegionSize(RegionInfo hri) { + ServerName sn = masterServices.getAssignmentManager().getRegionStates(). + getRegionServerOfRegion(hri); + RegionMetrics regionLoad = masterServices.getServerManager().getLoad(sn). + getRegionMetrics().get(hri.getRegionName()); + if (regionLoad == null) { + LOG.debug(hri.getRegionNameAsString() + " was not found in RegionsLoad"); + return -1; + } + return (long) regionLoad.getStoreFileSize().get(Size.Unit.MEGABYTE); + } + + protected boolean isMergeEnabled() { + boolean mergeEnabled = true; + try { + mergeEnabled = masterRpcServices + .isSplitOrMergeEnabled(null, + RequestConverter.buildIsSplitOrMergeEnabledRequest(MasterSwitchType.MERGE)) + .getEnabled(); + } catch (org.apache.hbase.thirdparty.com.google.protobuf.ServiceException e) { + LOG.warn("Unable to determine whether merge is enabled", e); + } + return mergeEnabled; + } + + protected boolean isSplitEnabled() { + boolean splitEnabled = true; + try { + splitEnabled = masterRpcServices + .isSplitOrMergeEnabled(null, + RequestConverter.buildIsSplitOrMergeEnabledRequest(MasterSwitchType.SPLIT)) + .getEnabled(); + } catch (ServiceException se) { + LOG.warn("Unable to determine whether split is enabled", se); + } + return splitEnabled; + } + + /** + * + * @param tableRegions + * @return average region size depending on + * {org.apache.hadoop.hbase.client.TableDescriptor#getNormalizerTargetRegionCount()} + * + * Also make sure we are sending regions of the same table + */ + protected double getAvgRegionSize(List<RegionInfo> tableRegions) { + long totalSizeMb = 0; + int acutalRegionCnt = 0; + for (RegionInfo hri : tableRegions) { + long regionSize = getRegionSize(hri); + // don't consider regions that are in bytes for averaging the size. + if (regionSize > 0) { + acutalRegionCnt++; + totalSizeMb += regionSize; + } + } + TableName table = tableRegions.get(0).getTable(); + int targetRegionCount = -1; + long targetRegionSize = -1; + try { + TableDescriptor tableDescriptor = masterServices.getTableDescriptors().get(table); + if(tableDescriptor != null) { + targetRegionCount = + tableDescriptor.getNormalizerTargetRegionCount(); + targetRegionSize = + tableDescriptor.getNormalizerTargetRegionSize(); + LOG.debug("Table {}: target region count is {}, target region size is {}", table, + targetRegionCount, targetRegionSize); + } + } catch (IOException e) { + LOG.warn( + "cannot get the target number and target size of table {}, they will be default value -1.", + table); + } + + double avgRegionSize; + if (targetRegionSize > 0) { + avgRegionSize = targetRegionSize; + } else if (targetRegionCount > 0) { + avgRegionSize = totalSizeMb / (double) targetRegionCount; + } else { + avgRegionSize = acutalRegionCnt == 0 ? 0 : totalSizeMb / (double) acutalRegionCnt; + } + + LOG.debug("Table " + table + ", total aggregated regions size: " + totalSizeMb); + LOG.debug("Table " + table + ", average region size: " + avgRegionSize); + return avgRegionSize; + } + + /** + * Computes the merge plans that should be executed for this table to converge + * average region towards target average or target region count + * + * @param table + * @return list of merge normalization plans + */ + protected List<NormalizationPlan> getMergeNormalizationPlan(TableName table) { + List<NormalizationPlan> plans = new ArrayList<>(); + List<RegionInfo> tableRegions = + masterServices.getAssignmentManager().getRegionStates().getRegionsOfTable(table); + double avgRegionSize = getAvgRegionSize(tableRegions); + LOG.debug("Table {}, average region size: {}", table, avgRegionSize); + LOG.debug("Computing normalization plan for table: {}, number of regions: {}", table, + tableRegions.size()); + + int candidateIdx = 0; + while (candidateIdx < tableRegions.size()) { + if (candidateIdx == tableRegions.size() - 1) { + break; + } + RegionInfo hri = tableRegions.get(candidateIdx); + long regionSize = getRegionSize(hri); + RegionInfo hri2 = tableRegions.get(candidateIdx + 1); + long regionSize2 = getRegionSize(hri2); + if (regionSize >= 0 && regionSize2 >= 0 && regionSize + regionSize2 < avgRegionSize) { + // atleast one of the two regions should be older than MIN_REGION_DURATION days + plans.add(new MergeNormalizationPlan(hri, hri2)); + candidateIdx++; + } else { + LOG.debug("Skipping region {} of table {} with size {}", hri.getRegionId(), table, + regionSize); + } + candidateIdx++; + } + return plans; + } + + /** + * Computes the split plans that should be executed for this table to converge + * average region size towards target average or target region count + * + * @param table + * @return list of split normalization plans + */ + protected List<NormalizationPlan> getSplitNormalizationPlan(TableName table) { + List<NormalizationPlan> plans = new ArrayList<>(); + List<RegionInfo> tableRegions = + masterServices.getAssignmentManager().getRegionStates().getRegionsOfTable(table); + double avgRegionSize = getAvgRegionSize(tableRegions); + LOG.debug("Table {}, average region size: {}", table, avgRegionSize); + + int candidateIdx = 0; + while (candidateIdx < tableRegions.size()) { + RegionInfo hri = tableRegions.get(candidateIdx); + long regionSize = getRegionSize(hri); + // if the region is > 2 times larger than average, we split it, split + // is more high priority normalization action than merge. + if (regionSize > 2 * avgRegionSize) { + LOG.info("Table {}, large region {} has size {}, more than twice avg size, splitting", + table, hri.getRegionNameAsString(), regionSize); + plans.add(new SplitNormalizationPlan(hri, null)); + } + candidateIdx++; + } + return plans; + } +} Review comment: Could this class be a utility class that implementations make use of rather than an abstract each must implement? 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