/**
* Copyright 2008 - CommonCrawl Foundation
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
**/
package org.commoncrawl.util;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Partitioner;
import org.commoncrawl.crawl.common.internal.CrawlEnvironment;
import org.commoncrawl.protocol.URLFPV2;
/**
*
* @author rana
*
*/
public class URLFPUtils {
/**
* return partition for given fingerprint using the NUM_SHARDS constant
*
* @param fingeprint
* @return
*/
public static int getPartitionGivenFP(URLFPV2 fingeprint) {
return (fingeprint.hashCode() & Integer.MAX_VALUE) % CrawlEnvironment.NUM_DB_SHARDS;
}
/**
* partition by subdomain
*
* @author rana
*
*/
public static class SubDomainPartitioner implements Partitioner<URLFPV2, Writable> {
@Override
public int getPartition(URLFPV2 key, Writable value,int numPartitions) {
return (((int)key.getDomainHash()) & Integer.MAX_VALUE) % numPartitions;
}
@Override
public void configure(JobConf job) {
}
}
/**
* partition by root domain
*
* @author rana
*
*/
public static class RootDomainPartitioner implements Partitioner<URLFPV2, Writable> {
@Override
public int getPartition(URLFPV2 key, Writable value,int numPartitions) {
return (((int)key.getRootDomainHash()) & Integer.MAX_VALUE) % numPartitions;
}
@Override
public void configure(JobConf job) {
}
}
}