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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.hadoop.ozone.container.common.impl;
import com.google.common.base.Preconditions;
import com.google.common.primitives.Longs;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdds.scm.container.common.helpers
.StorageContainerException;
import org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos;
import org.apache.hadoop.hdds.client.BlockID;
import org.apache.hadoop.ozone.container.common.helpers.ContainerData;
import org.apache.hadoop.ozone.container.common.helpers.KeyData;
import org.apache.hadoop.ozone.container.common.helpers.KeyUtils;
import org.apache.hadoop.ozone.container.common.interfaces.ContainerManager;
import org.apache.hadoop.ozone.container.common.interfaces.KeyManager;
import org.apache.hadoop.ozone.container.common.utils.ContainerCache;
import org.apache.hadoop.utils.MetadataStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static org.apache.hadoop.hdds.protocol.datanode.proto.ContainerProtos
.Result.NO_SUCH_KEY;
/**
* Key Manager impl.
*/
public class KeyManagerImpl implements KeyManager {
static final Logger LOG =
LoggerFactory.getLogger(KeyManagerImpl.class);
private static final float LOAD_FACTOR = 0.75f;
private final ContainerManager containerManager;
private final Configuration conf;
/**
* Constructs a key Manager.
*
* @param containerManager - Container Manager.
*/
public KeyManagerImpl(ContainerManager containerManager, Configuration conf) {
Preconditions.checkNotNull(containerManager, "Container manager cannot be" +
" null");
Preconditions.checkNotNull(conf, "Config cannot be null");
this.containerManager = containerManager;
this.conf = conf;
}
/**
* {@inheritDoc}
*/
@Override
public void putKey(KeyData data) throws IOException {
Preconditions.checkNotNull(data,
"KeyData cannot be null for put operation.");
Preconditions.checkState(data.getContainerID() >= 0,
"Container ID cannot be negative");
containerManager.readLock();
try {
// We are not locking the key manager since LevelDb serializes all actions
// against a single DB. We rely on DB level locking to avoid conflicts.
ContainerData cData = containerManager.readContainer(
data.getContainerID());
MetadataStore db = KeyUtils.getDB(cData, conf);
// This is a post condition that acts as a hint to the user.
// Should never fail.
Preconditions.checkNotNull(db, "DB cannot be null here");
db.put(Longs.toByteArray(data.getLocalID()), data
.getProtoBufMessage().toByteArray());
} finally {
containerManager.readUnlock();
}
}
/**
* {@inheritDoc}
*/
@Override
public KeyData getKey(KeyData data) throws IOException {
containerManager.readLock();
try {
Preconditions.checkNotNull(data, "Key data cannot be null");
Preconditions.checkNotNull(data.getContainerID(),
"Container name cannot be null");
ContainerData cData = containerManager.readContainer(data
.getContainerID());
MetadataStore db = KeyUtils.getDB(cData, conf);
// This is a post condition that acts as a hint to the user.
// Should never fail.
Preconditions.checkNotNull(db, "DB cannot be null here");
byte[] kData = db.get(Longs.toByteArray(data.getLocalID()));
if (kData == null) {
throw new StorageContainerException("Unable to find the key.",
NO_SUCH_KEY);
}
ContainerProtos.KeyData keyData =
ContainerProtos.KeyData.parseFrom(kData);
return KeyData.getFromProtoBuf(keyData);
} finally {
containerManager.readUnlock();
}
}
/**
* {@inheritDoc}
*/
@Override
public void deleteKey(BlockID blockID)
throws IOException {
Preconditions.checkNotNull(blockID, "block ID cannot be null.");
Preconditions.checkState(blockID.getContainerID() >= 0,
"Container ID cannot be negative.");
Preconditions.checkState(blockID.getLocalID() >= 0,
"Local ID cannot be negative.");
containerManager.readLock();
try {
ContainerData cData = containerManager
.readContainer(blockID.getContainerID());
MetadataStore db = KeyUtils.getDB(cData, conf);
// This is a post condition that acts as a hint to the user.
// Should never fail.
Preconditions.checkNotNull(db, "DB cannot be null here");
// Note : There is a race condition here, since get and delete
// are not atomic. Leaving it here since the impact is refusing
// to delete a key which might have just gotten inserted after
// the get check.
byte[] kKey = Longs.toByteArray(blockID.getLocalID());
byte[] kData = db.get(kKey);
if (kData == null) {
throw new StorageContainerException("Unable to find the key.",
NO_SUCH_KEY);
}
db.delete(kKey);
} finally {
containerManager.readUnlock();
}
}
/**
* {@inheritDoc}
*/
@Override
public List<KeyData> listKey(
long containerID, long startLocalID, int count)
throws IOException {
Preconditions.checkState(containerID >= 0,
"Container ID cannot be negative");
Preconditions.checkState(startLocalID >= 0,
"startLocal ID cannot be negative");
Preconditions.checkArgument(count > 0,
"Count must be a positive number.");
ContainerData cData = containerManager.readContainer(containerID);
MetadataStore db = KeyUtils.getDB(cData, conf);
List<KeyData> result = new ArrayList<>();
byte[] startKeyInBytes = Longs.toByteArray(startLocalID);
List<Map.Entry<byte[], byte[]>> range =
db.getSequentialRangeKVs(startKeyInBytes, count, null);
for (Map.Entry<byte[], byte[]> entry : range) {
KeyData value = KeyUtils.getKeyData(entry.getValue());
KeyData data = new KeyData(value.getBlockID());
result.add(data);
}
return result;
}
/**
* Shutdown keyManager.
*/
@Override
public void shutdown() {
Preconditions.checkState(this.containerManager.hasWriteLock(), "asserts " +
"that we are holding the container manager lock when shutting down.");
KeyUtils.shutdownCache(ContainerCache.getInstance(conf));
}
}
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