org.apache.phoenix.schema.SaltingUtil Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.phoenix.schema;
import java.util.List;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.phoenix.query.KeyRange;
import org.apache.phoenix.schema.RowKeySchema.RowKeySchemaBuilder;
import org.apache.phoenix.schema.types.PBinary;
import org.apache.phoenix.util.SchemaUtil;
import org.apache.phoenix.thirdparty.com.google.common.collect.Lists;
/**
* Utility methods related to transparent salting of row keys.
*/
public class SaltingUtil {
public static final int NUM_SALTING_BYTES = 1;
public static final Integer MAX_BUCKET_NUM = 256; // Unsigned byte.
public static final String SALTING_COLUMN_NAME = "_SALT";
public static final String SALTED_ROW_KEY_NAME = "_SALTED_KEY";
public static final PColumnImpl SALTING_COLUMN = new PColumnImpl(
PNameFactory.newName(SALTING_COLUMN_NAME), null, PBinary.INSTANCE, 1, 0, false, 0, SortOrder.getDefault(), 0, null, false, null, false, false, null,
HConstants.LATEST_TIMESTAMP);
public static final RowKeySchema VAR_BINARY_SALTED_SCHEMA = new RowKeySchemaBuilder(2)
.addField(SALTING_COLUMN, false, SortOrder.getDefault())
.addField(SchemaUtil.VAR_BINARY_DATUM, false, SortOrder.getDefault()).build();
public static List generateAllSaltingRanges(int bucketNum) {
List allRanges = Lists.newArrayListWithExpectedSize(bucketNum);
for (int i=0; i