package org.apache.cassandra.db.compaction;
/*
*
* 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.
*
*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.io.sstable.SSTableScanner;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.CloseableIterator;
import org.apache.cassandra.utils.Throttle;
public abstract class AbstractCompactionIterable implements Iterable<AbstractCompactedRow>, CompactionInfo.Holder
{
private static Logger logger = LoggerFactory.getLogger(AbstractCompactionIterable.class);
protected final OperationType type;
protected final CompactionController controller;
protected final long totalBytes;
protected volatile long bytesRead;
protected final List<SSTableScanner> scanners;
protected final Throttle throttle;
public AbstractCompactionIterable(CompactionController controller, OperationType type, List<SSTableScanner> scanners)
{
this.controller = controller;
this.type = type;
this.scanners = scanners;
this.bytesRead = 0;
long bytes = 0;
for (SSTableScanner scanner : scanners)
bytes += scanner.getFileLength();
this.totalBytes = bytes;
this.throttle = new Throttle(toString(), new Throttle.ThroughputFunction()
{
/** @return Instantaneous throughput target in bytes per millisecond. */
public int targetThroughput()
{
if (DatabaseDescriptor.getCompactionThroughputMbPerSec() < 1 || StorageService.instance.isBootstrapMode())
// throttling disabled
return 0;
// total throughput
int totalBytesPerMS = DatabaseDescriptor.getCompactionThroughputMbPerSec() * 1024 * 1024 / 1000;
// per stream throughput (target bytes per MS)
return totalBytesPerMS / Math.max(1, CompactionManager.instance.getActiveCompactions());
}
});
}
protected static List<SSTableScanner> getScanners(Iterable<SSTableReader> sstables) throws IOException
{
ArrayList<SSTableScanner> scanners = new ArrayList<SSTableScanner>();
for (SSTableReader sstable : sstables)
scanners.add(sstable.getDirectScanner());
return scanners;
}
public CompactionInfo getCompactionInfo()
{
return new CompactionInfo(this.hashCode(),
controller.getKeyspace(),
controller.getColumnFamily(),
type,
bytesRead,
totalBytes);
}
public abstract CloseableIterator<AbstractCompactedRow> iterator();
}