| /* |
| * 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.streaming; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.StandardOpenOption; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.UUID; |
| |
| import com.google.common.base.Charsets; |
| import org.apache.cassandra.io.sstable.format.SSTableWriter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.io.sstable.Descriptor; |
| import org.apache.cassandra.io.sstable.SSTable; |
| import org.apache.cassandra.io.util.FileUtils; |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| |
| /** |
| * Encapsulates the behavior for 'locking' any streamed sttables to a node. |
| * If a process crashes while converting a set of SSTableWriters to SSTReaders |
| * (meaning, some subset of SSTWs were converted, but not the entire set), we want |
| * to disregard the entire set as we will surely have missing data (by definition). |
| * |
| * Basic behavior id to write out the names of all SSTWs to a file, one SSTW per line, |
| * and then delete the file when complete (normal behavior). This should happen before |
| * converting any SSTWs. Thus, the lockfile is created, some SSTWs are converted, |
| * and if the process crashes, on restart, we look for any existing lockfile, and delete |
| * any referenced SSTRs. |
| */ |
| public class StreamLockfile |
| { |
| public static final String FILE_EXT = ".lockfile"; |
| private static final Logger logger = LoggerFactory.getLogger(StreamLockfile.class); |
| |
| private final File lockfile; |
| |
| public StreamLockfile(File directory, UUID uuid) |
| { |
| lockfile = new File(directory, uuid + FILE_EXT); |
| } |
| |
| public StreamLockfile(File lockfile) |
| { |
| assert lockfile != null; |
| this.lockfile = lockfile; |
| } |
| |
| public void create(Collection<SSTableWriter> sstables) |
| { |
| List<String> sstablePaths = new ArrayList<>(sstables.size()); |
| for (SSTableWriter writer : sstables) |
| { |
| /* write out the file names *without* the 'tmp-file' flag in the file name. |
| this class will not need to clean up tmp files (on restart), CassandraDaemon does that already, |
| just make sure we delete the fully-formed SSTRs. */ |
| sstablePaths.add(writer.descriptor.asType(Descriptor.Type.FINAL).baseFilename()); |
| } |
| |
| try |
| { |
| Files.write(lockfile.toPath(), sstablePaths, Charsets.UTF_8, |
| StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE, StandardOpenOption.DSYNC); |
| } |
| catch (IOException e) |
| { |
| logger.warn(String.format("Could not create lockfile %s for stream session, nothing to worry too much about", lockfile), e); |
| } |
| } |
| |
| public void delete() |
| { |
| FileUtils.delete(lockfile); |
| } |
| |
| public void cleanup() |
| { |
| List<String> files = readLockfile(lockfile); |
| for (String file : files) |
| { |
| try |
| { |
| Descriptor desc = Descriptor.fromFilename(file, true); |
| SSTable.delete(desc, SSTable.componentsFor(desc)); |
| } |
| catch (Exception e) |
| { |
| JVMStabilityInspector.inspectThrowable(e); |
| logger.warn("failed to delete a potentially stale sstable {}", file); |
| } |
| } |
| } |
| |
| private List<String> readLockfile(File lockfile) |
| { |
| try |
| { |
| return Files.readAllLines(lockfile.toPath(), Charsets.UTF_8); |
| } |
| catch (IOException e) |
| { |
| logger.info("couldn't read lockfile {}, ignoring", lockfile.getAbsolutePath()); |
| return Collections.emptyList(); |
| } |
| } |
| |
| } |