| /* |
| * 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; |
| |
| import java.util.Set; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.db.ColumnFamilyStore; |
| import org.apache.cassandra.db.Directories; |
| import org.apache.cassandra.db.compaction.writers.CompactionAwareWriter; |
| import org.apache.cassandra.db.lifecycle.LifecycleTransaction; |
| import org.apache.cassandra.io.sstable.CorruptSSTableException; |
| import org.apache.cassandra.io.sstable.format.SSTableFormat.Components; |
| import org.apache.cassandra.io.sstable.format.SSTableReader; |
| import org.apache.cassandra.io.sstable.metadata.StatsMetadata; |
| |
| /** |
| * Special compaction task that does not do any compaction, instead it |
| * just mutates the level metadata on the sstable and notifies the compaction |
| * strategy. |
| */ |
| public class SingleSSTableLCSTask extends AbstractCompactionTask |
| { |
| private static final Logger logger = LoggerFactory.getLogger(SingleSSTableLCSTask.class); |
| |
| private final int level; |
| |
| public SingleSSTableLCSTask(ColumnFamilyStore cfs, LifecycleTransaction txn, int level) |
| { |
| super(cfs, txn); |
| assert txn.originals().size() == 1; |
| this.level = level; |
| } |
| |
| @Override |
| public CompactionAwareWriter getCompactionAwareWriter(ColumnFamilyStore cfs, Directories directories, LifecycleTransaction txn, Set<SSTableReader> nonExpiredSSTables) |
| { |
| throw new UnsupportedOperationException("This method should never be called on SingleSSTableLCSTask"); |
| } |
| |
| @Override |
| protected int executeInternal(ActiveCompactionsTracker activeCompactions) |
| { |
| run(); |
| return 1; |
| } |
| |
| @Override |
| protected void runMayThrow() |
| { |
| SSTableReader sstable = transaction.onlyOne(); |
| StatsMetadata metadataBefore = sstable.getSSTableMetadata(); |
| if (level == metadataBefore.sstableLevel) |
| { |
| logger.info("Not compacting {}, level is already {}", sstable, level); |
| } |
| else |
| { |
| try |
| { |
| logger.info("Changing level on {} from {} to {}", sstable, metadataBefore.sstableLevel, level); |
| sstable.mutateLevelAndReload(level); |
| } |
| catch (Throwable t) |
| { |
| transaction.abort(); |
| throw new CorruptSSTableException(t, sstable.descriptor.fileFor(Components.DATA)); |
| } |
| cfs.getTracker().notifySSTableMetadataChanged(sstable, metadataBefore); |
| } |
| finishTransaction(sstable); |
| } |
| |
| private void finishTransaction(SSTableReader sstable) |
| { |
| // we simply cancel the transaction since no sstables are added or removed - we just |
| // write a new sstable metadata above and then atomically move the new file on top of the old |
| transaction.cancel(sstable); |
| transaction.prepareToCommit(); |
| transaction.commit(); |
| } |
| } |