HBASE-16765 New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables.
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@ -45,7 +45,7 @@ import org.apache.hadoop.hbase.classification.InterfaceAudience;
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public class IncreasingToUpperBoundRegionSplitPolicy extends ConstantSizeRegionSplitPolicy {
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private static final Log LOG = LogFactory.getLog(IncreasingToUpperBoundRegionSplitPolicy.class);
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private long initialSize;
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protected long initialSize;
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@Override
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protected void configureForRegion(HRegion region) {
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@ -116,7 +116,7 @@ public class IncreasingToUpperBoundRegionSplitPolicy extends ConstantSizeRegionS
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}
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/**
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* @return Region max size or {@code count of regions cubed * flushsize},
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* @return Region max size or {@code count of regions cubed * 2 * flushsize},
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* which ever is smaller; guard against there being zero regions on this server.
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*/
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protected long getSizeToCheck(final int tableRegionsCount) {
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@ -0,0 +1,32 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hbase.regionserver;
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public class SteppingSplitPolicy extends IncreasingToUpperBoundRegionSplitPolicy {
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/**
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* @return flushSize * 2 if there's exactly one region of the table in question
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* found on this regionserver. Otherwise max file size.
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* This allows a table to spread quickly across servers, while avoiding creating
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* too many regions.
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*/
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protected long getSizeToCheck(final int tableRegionsCount) {
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return tableRegionsCount == 1 ? this.initialSize : getDesiredMaxFileSize();
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}
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}
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