| /* |
| * 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.hadoop.hdfs.server.namenode.snapshot; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.server.namenode.FSNamesystem; |
| import org.apache.hadoop.util.StringUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| import static org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.DFS_NAMENODE_SNAPSHOT_DELETION_ORDERED_GC_PERIOD_MS; |
| import static org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.DFS_NAMENODE_SNAPSHOT_DELETION_ORDERED_GC_PERIOD_MS_DEFAULT; |
| |
| public class SnapshotDeletionGc { |
| public static final Logger LOG = LoggerFactory.getLogger( |
| SnapshotDeletionGc.class); |
| |
| private final FSNamesystem namesystem; |
| private final long deletionOrderedGcPeriodMs; |
| private final AtomicReference<Timer> timer = new AtomicReference<>(); |
| |
| public SnapshotDeletionGc(FSNamesystem namesystem, Configuration conf) { |
| this.namesystem = namesystem; |
| |
| this.deletionOrderedGcPeriodMs = conf.getLong( |
| DFS_NAMENODE_SNAPSHOT_DELETION_ORDERED_GC_PERIOD_MS, |
| DFS_NAMENODE_SNAPSHOT_DELETION_ORDERED_GC_PERIOD_MS_DEFAULT); |
| LOG.info("{} = {}", DFS_NAMENODE_SNAPSHOT_DELETION_ORDERED_GC_PERIOD_MS, |
| deletionOrderedGcPeriodMs); |
| } |
| |
| public void schedule() { |
| if (timer.get() != null) { |
| return; |
| } |
| final Timer t = new Timer(getClass().getSimpleName(), true); |
| if (timer.compareAndSet(null, t)) { |
| LOG.info("Schedule at fixed rate {}", |
| StringUtils.formatTime(deletionOrderedGcPeriodMs)); |
| t.scheduleAtFixedRate(new GcTask(), |
| deletionOrderedGcPeriodMs, deletionOrderedGcPeriodMs); |
| } |
| } |
| |
| public void cancel() { |
| final Timer t = timer.getAndSet(null); |
| if (t != null) { |
| LOG.info("cancel"); |
| t.cancel(); |
| } |
| } |
| |
| private void gcDeletedSnapshot(String name) { |
| final Snapshot.Root deleted; |
| namesystem.readLock(); |
| try { |
| deleted = namesystem.getSnapshotManager().chooseDeletedSnapshot(); |
| } catch (Throwable e) { |
| LOG.error("Failed to chooseDeletedSnapshot", e); |
| throw e; |
| } finally { |
| namesystem.readUnlock(); |
| } |
| if (deleted == null) { |
| LOG.trace("{}: no snapshots are marked as deleted.", name); |
| return; |
| } |
| |
| final String snapshotRoot = deleted.getRootFullPathName(); |
| final String snapshotName = deleted.getLocalName(); |
| LOG.info("{}: delete snapshot {} from {}", |
| name, snapshotName, snapshotRoot); |
| |
| try { |
| namesystem.gcDeletedSnapshot(snapshotRoot, snapshotName); |
| } catch (Throwable e) { |
| LOG.error("Failed to gcDeletedSnapshot " + deleted.getFullPathName(), e); |
| } |
| } |
| |
| private class GcTask extends TimerTask { |
| private final AtomicInteger count = new AtomicInteger(); |
| |
| @Override |
| public void run() { |
| final int id = count.incrementAndGet(); |
| gcDeletedSnapshot(getClass().getSimpleName() + " #" + id); |
| } |
| } |
| } |