/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.workloads;
import java.util.Properties;
import com.yahoo.ycsb.WorkloadException;
import com.yahoo.ycsb.Client;
import com.yahoo.ycsb.generator.IntegerGenerator;
/**
* A disk-fragmenting workload.
* <p>
* Properties to control the client:
* </p>
* <UL>
* <LI><b>disksize</b>: how many bytes of storage can the disk store? (default 100,000,000)
* <LI><b>occupancy</b>: what fraction of the available storage should be used? (default 0.9)
* <LI><b>requestdistribution</b>: what distribution should be used to select the records to operate on - uniform, zipfian or latest (default: histogram)
* </ul>
*
*
* <p> See also:
* Russell Sears, Catharine van Ingen.
* <a href='https://database.cs.wisc.edu/cidr/cidr2007/papers/cidr07p34.pdf'>Fragmentation in Large Object Repositories</a>,
* CIDR 2006. [<a href='https://database.cs.wisc.edu/cidr/cidr2007/slides/p34-sears.ppt'>Presentation</a>]
* </p>
*
*
* @author sears
*
*/
public class ConstantOccupancyWorkload extends CoreWorkload {
long disksize;
long storageages;
IntegerGenerator objectsizes;
double occupancy;
long object_count;
public static final String STORAGE_AGE_PROPERTY = "storageages";
public static final long STORAGE_AGE_PROPERTY_DEFAULT = 10;
public static final String DISK_SIZE_PROPERTY = "disksize";
public static final long DISK_SIZE_PROPERTY_DEFAULT = 100 * 1000 * 1000;
public static final String OCCUPANCY_PROPERTY = "occupancy";
public static final double OCCUPANCY_PROPERTY_DEFAULT = 0.9;
@Override
public void init(Properties p) throws WorkloadException
{
disksize = Long.parseLong( p.getProperty(DISK_SIZE_PROPERTY, DISK_SIZE_PROPERTY_DEFAULT+""));
storageages = Long.parseLong( p.getProperty(STORAGE_AGE_PROPERTY, STORAGE_AGE_PROPERTY_DEFAULT+""));
occupancy = Double.parseDouble(p.getProperty(OCCUPANCY_PROPERTY, OCCUPANCY_PROPERTY_DEFAULT+""));
if(p.getProperty(Client.RECORD_COUNT_PROPERTY) != null ||
p.getProperty(Client.INSERT_COUNT_PROPERTY) != null ||
p.getProperty(Client.OPERATION_COUNT_PROPERTY) != null) {
System.err.println("Warning: record, insert or operation count was set prior to initting ConstantOccupancyWorkload. Overriding old values.");
}
IntegerGenerator g = CoreWorkload.getFieldLengthGenerator(p);
double fieldsize = g.mean();
int fieldcount = Integer.parseInt(p.getProperty(FIELD_COUNT_PROPERTY, FIELD_COUNT_PROPERTY_DEFAULT));
object_count = (long)(occupancy * ((double)disksize / (fieldsize * (double)fieldcount)));
if(object_count == 0) {
throw new IllegalStateException("Object count was zero. Perhaps disksize is too low?");
}
p.setProperty(Client.RECORD_COUNT_PROPERTY, object_count+"");
p.setProperty(Client.OPERATION_COUNT_PROPERTY, (storageages*object_count)+"");
p.setProperty(Client.INSERT_COUNT_PROPERTY, object_count+"");
super.init(p);
}
}