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List snapshots of dropped tables
Patch by Paulo Motta; Reviewed by Stefan Miklosovic and Brandon Williams or CASSANDRA-16843
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| /* | ||
| * 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.service.snapshot; | ||
|
|
||
| import java.io.IOException; | ||
| import java.nio.file.FileVisitResult; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.nio.file.SimpleFileVisitor; | ||
| import java.nio.file.attribute.BasicFileAttributes; | ||
| import java.util.Arrays; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.UUID; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import org.apache.cassandra.config.DatabaseDescriptor; | ||
| import org.apache.cassandra.db.Directories; | ||
| import org.apache.cassandra.io.util.File; | ||
|
|
||
| import static org.apache.cassandra.db.Directories.SNAPSHOT_SUBDIR; | ||
| import static org.apache.cassandra.service.snapshot.TableSnapshot.buildSnapshotId; | ||
|
|
||
| /** | ||
| * Loads snapshot metadata from data directories | ||
| */ | ||
| public class SnapshotLoader extends SimpleFileVisitor<Path> | ||
| { | ||
| private static final Logger logger = LoggerFactory.getLogger(SnapshotLoader.class); | ||
|
|
||
| static final Pattern SNAPSHOT_DIR_PATTERN = Pattern.compile("(?<keyspace>\\w+)/(?<tableName>\\w+)\\-(?<tableId>[0-9a-f]{32})/snapshots/(?<tag>[\\w-]+)$"); | ||
|
|
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| private final Collection<Path> dataDirectories; | ||
| private final Map<String, TableSnapshot.Builder> snapshots = new HashMap<>(); | ||
|
|
||
| public SnapshotLoader() | ||
| { | ||
| this(DatabaseDescriptor.getAllDataFileLocations()); | ||
| } | ||
|
|
||
| public SnapshotLoader(String[] dataDirectories) | ||
| { | ||
| this.dataDirectories = Arrays.stream(dataDirectories).map(Paths::get).collect(Collectors.toList()); | ||
| } | ||
|
|
||
| public SnapshotLoader(Collection<Path> dataDirs) | ||
| { | ||
| this.dataDirectories = dataDirs; | ||
| } | ||
|
|
||
| public Set<TableSnapshot> loadSnapshots() | ||
| { | ||
| for (Path dataDir : dataDirectories) | ||
| { | ||
| try | ||
| { | ||
| Files.walkFileTree(dataDir, Collections.EMPTY_SET, 5, this); | ||
| } | ||
| catch (IOException e) | ||
| { | ||
| throw new RuntimeException(String.format("Error while loading snapshots from %s", dataDir)); | ||
| } | ||
| } | ||
| return snapshots.values().stream().map(TableSnapshot.Builder::build).collect(Collectors.toSet()); | ||
| } | ||
|
|
||
| public FileVisitResult preVisitDirectory(Path subdir, BasicFileAttributes attrs) | ||
| { | ||
| if (subdir.getParent().getFileName().toString().equals(SNAPSHOT_SUBDIR)) | ||
| { | ||
| logger.trace("Processing directory " + subdir); | ||
| Matcher snapshotDirMatcher = SNAPSHOT_DIR_PATTERN.matcher(subdir.toString()); | ||
| if (snapshotDirMatcher.find()) | ||
| { | ||
| try | ||
| { | ||
| loadSnapshotFromDir(snapshotDirMatcher, subdir); | ||
| } catch (Throwable e) | ||
| { | ||
| logger.warn("Could not load snapshot from {}.", subdir, e); | ||
| } | ||
| } | ||
| return FileVisitResult.SKIP_SUBTREE; | ||
| } | ||
|
|
||
| return subdir.getFileName().equals(Directories.BACKUPS_SUBDIR) | ||
| ? FileVisitResult.SKIP_SUBTREE | ||
| : FileVisitResult.CONTINUE; | ||
| } | ||
|
|
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| private void loadSnapshotFromDir(Matcher snapshotDirMatcher, Path snapshotDir) | ||
| { | ||
| String keyspaceName = snapshotDirMatcher.group("keyspace"); | ||
| String tableName = snapshotDirMatcher.group("tableName"); | ||
| UUID tableId = parseUUID(snapshotDirMatcher.group("tableId")); | ||
| String tag = snapshotDirMatcher.group("tag"); | ||
| String snapshotId = buildSnapshotId(keyspaceName, tableName, tableId, tag); | ||
| TableSnapshot.Builder builder = snapshots.computeIfAbsent(snapshotId, k -> new TableSnapshot.Builder(keyspaceName, tableName, tableId, tag)); | ||
| builder.addSnapshotDir(new File(snapshotDir)); | ||
| } | ||
|
|
||
| /** | ||
| * Given an UUID string without dashes (ie. c7e513243f0711ec9bbc0242ac130002) | ||
| * return an UUID object (ie. c7e51324-3f07-11ec-9bbc-0242ac130002) | ||
| */ | ||
| protected static UUID parseUUID(String uuidWithoutDashes) throws IllegalArgumentException | ||
| { | ||
| assert uuidWithoutDashes.length() == 32 && !uuidWithoutDashes.contains("-"); | ||
| String dashedUUID = uuidWithoutDashes.replaceFirst("([0-9a-f]{8})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]{4})([0-9a-f]+)", "$1-$2-$3-$4-$5"); | ||
| return UUID.fromString(dashedUUID); | ||
| } | ||
| } |
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