org.apache.hadoop.hbase.regionserver.IncreasingToUpperBoundRegionSplitPolicy Maven / Gradle / Ivy
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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.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.hadoop.hbase.client.TableDescriptor;
import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 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.
*
* 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}.
*
* 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
public String toString() {
return "IncreasingToUpperBoundRegionSplitPolicy{" + "initialSize=" + initialSize + ", "
+ super.toString() + '}';
}
@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;
}
/** Returns 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 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);
}
}