org.apache.hudi.org.apache.hadoop.hbase.regionserver.KeyPrefixRegionSplitRestriction Maven / Gradle / Ivy
/*
* 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.Arrays;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.TableDescriptor;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A {@link RegionSplitRestriction} implementation that groups rows by a prefix of the row-key.
*
* This ensures that a region is not split "inside" a prefix of a row key.
* I.e. rows can be co-located in a region by their prefix.
*/
@InterfaceAudience.Private
public class KeyPrefixRegionSplitRestriction extends RegionSplitRestriction {
private static final Logger LOG =
LoggerFactory.getLogger(KeyPrefixRegionSplitRestriction.class);
public static final String PREFIX_LENGTH_KEY =
"hbase.regionserver.region.split_restriction.prefix_length";
private int prefixLength;
@Override
public void initialize(TableDescriptor tableDescriptor, Configuration conf) throws IOException {
String prefixLengthString = tableDescriptor.getValue(PREFIX_LENGTH_KEY);
if (prefixLengthString == null) {
prefixLengthString = conf.get(PREFIX_LENGTH_KEY);
if (prefixLengthString == null) {
LOG.error("{} not specified for table {}. "
+ "Using the default RegionSplitRestriction", PREFIX_LENGTH_KEY,
tableDescriptor.getTableName());
return;
}
}
try {
prefixLength = Integer.parseInt(prefixLengthString);
} catch (NumberFormatException ignored) {
}
if (prefixLength <= 0) {
LOG.error("Invalid value for {} for table {}:{}. "
+ "Using the default RegionSplitRestriction", PREFIX_LENGTH_KEY,
tableDescriptor.getTableName(), prefixLengthString);
}
}
@Override
public byte[] getRestrictedSplitPoint(byte[] splitPoint) {
if (prefixLength > 0) {
// group split keys by a prefix
return Arrays.copyOf(splitPoint, Math.min(prefixLength, splitPoint.length));
} else {
return splitPoint;
}
}
}