| /* |
| * 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.cassandra.db.compaction.writers; |
| |
| import java.io.File; |
| import java.util.Set; |
| |
| import org.apache.cassandra.db.ColumnFamilyStore; |
| import org.apache.cassandra.db.RowIndexEntry; |
| import org.apache.cassandra.db.compaction.AbstractCompactedRow; |
| import org.apache.cassandra.db.compaction.OperationType; |
| import org.apache.cassandra.db.lifecycle.LifecycleTransaction; |
| import org.apache.cassandra.io.sstable.Descriptor; |
| import org.apache.cassandra.io.sstable.format.SSTableReader; |
| import org.apache.cassandra.io.sstable.format.SSTableWriter; |
| import org.apache.cassandra.io.sstable.metadata.MetadataCollector; |
| |
| public class MaxSSTableSizeWriter extends CompactionAwareWriter |
| { |
| private final long expectedWriteSize; |
| private final long maxSSTableSize; |
| private final int level; |
| private final long estimatedSSTables; |
| private final Set<SSTableReader> allSSTables; |
| |
| @SuppressWarnings("resource") |
| public MaxSSTableSizeWriter(ColumnFamilyStore cfs, LifecycleTransaction txn, Set<SSTableReader> nonExpiredSSTables, long maxSSTableSize, int level, boolean offline, OperationType compactionType) |
| { |
| super(cfs, txn, nonExpiredSSTables, offline); |
| this.allSSTables = txn.originals(); |
| this.level = level; |
| this.maxSSTableSize = maxSSTableSize; |
| long totalSize = getTotalWriteSize(nonExpiredSSTables, estimatedTotalKeys, cfs, compactionType); |
| expectedWriteSize = Math.min(maxSSTableSize, totalSize); |
| estimatedSSTables = Math.max(1, totalSize / maxSSTableSize); |
| File sstableDirectory = cfs.directories.getLocationForDisk(getWriteDirectory(expectedWriteSize)); |
| @SuppressWarnings("resource") |
| SSTableWriter writer = SSTableWriter.create(Descriptor.fromFilename(cfs.getTempSSTablePath(sstableDirectory)), |
| estimatedTotalKeys / estimatedSSTables, |
| minRepairedAt, |
| cfs.metadata, |
| cfs.partitioner, |
| new MetadataCollector(allSSTables, cfs.metadata.comparator, level)); |
| sstableWriter.switchWriter(writer); |
| } |
| |
| /** |
| * Gets the estimated total amount of data to write during compaction |
| */ |
| private static long getTotalWriteSize(Iterable<SSTableReader> nonExpiredSSTables, long estimatedTotalKeys, ColumnFamilyStore cfs, OperationType compactionType) |
| { |
| long estimatedKeysBeforeCompaction = 0; |
| for (SSTableReader sstable : nonExpiredSSTables) |
| estimatedKeysBeforeCompaction += sstable.estimatedKeys(); |
| estimatedKeysBeforeCompaction = Math.max(1, estimatedKeysBeforeCompaction); |
| double estimatedCompactionRatio = (double) estimatedTotalKeys / estimatedKeysBeforeCompaction; |
| return Math.round(estimatedCompactionRatio * cfs.getExpectedCompactedFileSize(nonExpiredSSTables, compactionType)); |
| } |
| |
| @Override |
| public boolean append(AbstractCompactedRow row) |
| { |
| RowIndexEntry rie = sstableWriter.append(row); |
| if (sstableWriter.currentWriter().getOnDiskFilePointer() > maxSSTableSize) |
| { |
| File sstableDirectory = cfs.directories.getLocationForDisk(getWriteDirectory(expectedWriteSize)); |
| @SuppressWarnings("resource") |
| SSTableWriter writer = SSTableWriter.create(Descriptor.fromFilename(cfs.getTempSSTablePath(sstableDirectory)), |
| estimatedTotalKeys / estimatedSSTables, |
| minRepairedAt, |
| cfs.metadata, |
| cfs.partitioner, |
| new MetadataCollector(allSSTables, cfs.metadata.comparator, level)); |
| |
| sstableWriter.switchWriter(writer); |
| } |
| return rie != null; |
| } |
| } |