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HBASE-22285 A normalizer which merges small size regions with adjacen…
…t regions (apache#978) Signed-off-by: Viraj Jasani <vjasani@apache.org> Signed-off-by: stack <stack@apache.org>
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...ver/src/main/java/org/apache/hadoop/hbase/master/normalizer/AbstractRegionNormalizer.java
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/** | ||
* | ||
* 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; | ||
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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.yetus.audience.InterfaceAudience; | ||
import org.slf4j.Logger; | ||
import org.slf4j.LoggerFactory; | ||
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import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException; | ||
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import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter; | ||
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@InterfaceAudience.Private | ||
public abstract class AbstractRegionNormalizer implements RegionNormalizer { | ||
private static final Logger LOG = LoggerFactory.getLogger(AbstractRegionNormalizer.class); | ||
protected MasterServices masterServices; | ||
protected MasterRpcServices masterRpcServices; | ||
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/** | ||
* Set the master service. | ||
* @param masterServices inject instance of MasterServices | ||
*/ | ||
@Override | ||
public void setMasterServices(MasterServices masterServices) { | ||
this.masterServices = masterServices; | ||
} | ||
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@Override | ||
public void setMasterRpcServices(MasterRpcServices masterRpcServices) { | ||
this.masterRpcServices = masterRpcServices; | ||
} | ||
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/** | ||
* @param hri regioninfo | ||
* @return size of region in MB and if region is not found than -1 | ||
*/ | ||
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("{} was not found in RegionsLoad", hri.getRegionNameAsString()); | ||
return -1; | ||
} | ||
return (long) regionLoad.getStoreFileSize().get(Size.Unit.MEGABYTE); | ||
} | ||
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protected boolean isMergeEnabled() { | ||
boolean mergeEnabled = true; | ||
try { | ||
mergeEnabled = masterRpcServices | ||
.isSplitOrMergeEnabled(null, | ||
RequestConverter.buildIsSplitOrMergeEnabledRequest(MasterSwitchType.MERGE)) | ||
.getEnabled(); | ||
} catch (ServiceException e) { | ||
LOG.warn("Unable to determine whether merge is enabled", e); | ||
} | ||
return mergeEnabled; | ||
} | ||
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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; | ||
} | ||
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/** | ||
* @param tableRegions regions of table to normalize | ||
* @return average region size depending on | ||
* @see org.apache.hadoop.hbase.client.TableDescriptor#getNormalizerTargetRegionCount() | ||
* Also make sure tableRegions contains regions of the same table | ||
*/ | ||
protected double getAverageRegionSize(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, e); | ||
} | ||
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double avgRegionSize; | ||
if (targetRegionSize > 0) { | ||
avgRegionSize = targetRegionSize; | ||
} else if (targetRegionCount > 0) { | ||
avgRegionSize = totalSizeMb / (double) targetRegionCount; | ||
} else { | ||
avgRegionSize = acutalRegionCnt == 0 ? 0 : totalSizeMb / (double) acutalRegionCnt; | ||
} | ||
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LOG.debug("Table {}, total aggregated regions size: {} and average region size {}", table, | ||
totalSizeMb, avgRegionSize); | ||
return avgRegionSize; | ||
} | ||
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/** | ||
* Computes the merge plans that should be executed for this table to converge average region | ||
* towards target average or target region count | ||
* @param table table to normalize | ||
* @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 = getAverageRegionSize(tableRegions); | ||
LOG.debug("Table {}, average region size: {}.\n Computing normalization plan for table: {}, " | ||
+ "number of regions: {}", | ||
table, avgRegionSize, table, tableRegions.size()); | ||
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int candidateIdx = 0; | ||
while (candidateIdx < tableRegions.size() - 1) { | ||
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.getRegionNameAsString(), table, | ||
regionSize); | ||
} | ||
candidateIdx++; | ||
} | ||
return plans; | ||
} | ||
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/** | ||
* 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 table to normalize | ||
* @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 = getAverageRegionSize(tableRegions); | ||
LOG.debug("Table {}, average region size: {}", table, avgRegionSize); | ||
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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; | ||
} | ||
} |
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hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/MergeNormalizer.java
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/** | ||
* | ||
* 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; | ||
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import java.sql.Timestamp; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
import java.util.concurrent.TimeUnit; | ||
import org.apache.hadoop.conf.Configuration; | ||
import org.apache.hadoop.hbase.HBaseConfiguration; | ||
import org.apache.hadoop.hbase.HBaseIOException; | ||
import org.apache.hadoop.hbase.TableName; | ||
import org.apache.hadoop.hbase.client.RegionInfo; | ||
import org.apache.yetus.audience.InterfaceAudience; | ||
import org.slf4j.Logger; | ||
import org.slf4j.LoggerFactory; | ||
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/** | ||
* Implementation of MergeNormalizer Logic in use: | ||
* <ol> | ||
* <li>get all regions of a given table | ||
* <li>get avg size S of each region (by total size of store files reported in RegionLoad) | ||
* <li>two regions R1 and its neighbour R2 are merged, if R1 + R2 < S, and all such regions are | ||
* returned to be merged | ||
* <li>Otherwise, no action is performed | ||
* </ol> | ||
* <p> | ||
* Considering the split policy takes care of splitting region we also want a way to merge when | ||
* regions are too small. It is little different than what | ||
* {@link org.apache.hadoop.hbase.master.normalizer.SimpleRegionNormalizer} does. Instead of doing | ||
* splits and merge both to achieve average region size in cluster for a table. We only merge | ||
* regions(older than defined age) and rely on Split policy for region splits. The goal of this | ||
* normalizer is to merge small regions to make size of regions close to average size (which is | ||
* either average size or depends on either target region size or count in that order). Consider | ||
* region with size 1,2,3,4,10,10,10,5,4,3. If minimum merge age is set to 0 days this algorithm | ||
* will find the average size as 7.2 assuming we haven't provided target region count or size. Now | ||
* we will find all those adjacent region which if merged doesn't exceed the average size. so we | ||
* will merge 1-2, 3-4, 4,3 in our first run. To get best results from this normalizer theoretically | ||
* we should set target region size between 0.5 to 0.75 of configured maximum file size. If we set | ||
* min merge age as 3 we create plan as above and see if we have a plan which has both regions as | ||
* new(age less than 3) we discard such plans and we consider the regions even if one of the region | ||
* is old enough to be merged. | ||
* </p> | ||
*/ | ||
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@InterfaceAudience.Private | ||
public class MergeNormalizer extends AbstractRegionNormalizer { | ||
private static final Logger LOG = LoggerFactory.getLogger(MergeNormalizer.class); | ||
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private int minRegionCount; | ||
private int minRegionAge; | ||
private static long[] skippedCount = new long[NormalizationPlan.PlanType.values().length]; | ||
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public MergeNormalizer() { | ||
Configuration conf = HBaseConfiguration.create(); | ||
minRegionCount = conf.getInt("hbase.normalizer.min.region.count", 3); | ||
minRegionAge = conf.getInt("hbase.normalizer.min.region.merge.age", 3); | ||
} | ||
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@Override | ||
public void planSkipped(RegionInfo hri, NormalizationPlan.PlanType type) { | ||
skippedCount[type.ordinal()]++; | ||
} | ||
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@Override | ||
public long getSkippedCount(NormalizationPlan.PlanType type) { | ||
return skippedCount[type.ordinal()]; | ||
} | ||
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@Override | ||
public List<NormalizationPlan> computePlanForTable(TableName table) throws HBaseIOException { | ||
List<NormalizationPlan> plans = new ArrayList<>(); | ||
if (!shouldNormalize(table)) { | ||
return null; | ||
} | ||
// at least one of the two regions should be older than MIN_REGION_AGE days | ||
List<NormalizationPlan> normalizationPlans = getMergeNormalizationPlan(table); | ||
for (NormalizationPlan plan : normalizationPlans) { | ||
if (plan instanceof MergeNormalizationPlan) { | ||
RegionInfo hri = ((MergeNormalizationPlan) plan).getFirstRegion(); | ||
RegionInfo hri2 = ((MergeNormalizationPlan) plan).getSecondRegion(); | ||
if (isOldEnoughToMerge(hri) || isOldEnoughToMerge(hri2)) { | ||
plans.add(plan); | ||
} else { | ||
LOG.debug("Skipping region {} and {} as they are both new", hri.getEncodedName(), | ||
hri2.getEncodedName()); | ||
} | ||
} | ||
} | ||
if (plans.isEmpty()) { | ||
LOG.debug("No normalization needed, regions look good for table: {}", table); | ||
return null; | ||
} | ||
return plans; | ||
} | ||
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private boolean isOldEnoughToMerge(RegionInfo hri) { | ||
Timestamp currentTime = new Timestamp(System.currentTimeMillis()); | ||
Timestamp hriTime = new Timestamp(hri.getRegionId()); | ||
boolean isOld = | ||
new Timestamp(hriTime.getTime() + TimeUnit.DAYS.toMillis(minRegionAge)) | ||
.before(currentTime); | ||
return isOld; | ||
} | ||
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private boolean shouldNormalize(TableName table) { | ||
boolean normalize = false; | ||
if (table == null || table.isSystemTable()) { | ||
LOG.debug("Normalization of system table {} isn't allowed", table); | ||
} else if (!isMergeEnabled()) { | ||
LOG.debug("Merge disabled for table: {}", table); | ||
} else { | ||
List<RegionInfo> tableRegions = | ||
masterServices.getAssignmentManager().getRegionStates().getRegionsOfTable(table); | ||
if (tableRegions == null || tableRegions.size() < minRegionCount) { | ||
int nrRegions = tableRegions == null ? 0 : tableRegions.size(); | ||
LOG.debug( | ||
"Table {} has {} regions, required min number of regions for normalizer to run is {} , " | ||
+ "not running normalizer", | ||
table, nrRegions, minRegionCount); | ||
} else { | ||
normalize = true; | ||
} | ||
} | ||
return normalize; | ||
} | ||
} |
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