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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.hbase.io.hfile;
import static org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_IOENGINE_KEY;
import static org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_SIZE_KEY;
import java.io.IOException;
import java.util.concurrent.ForkJoinPool;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
import org.apache.hadoop.hbase.io.util.MemorySizeUtil;
import org.apache.hadoop.hbase.util.ReflectionUtils;
import org.apache.hadoop.util.StringUtils;
import org.apache.yetus.audience.InterfaceAudience;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@InterfaceAudience.Private
public final class BlockCacheFactory {
private static final Logger LOG = LoggerFactory.getLogger(BlockCacheFactory.class.getName());
/**
* Configuration keys for Bucket cache
*/
/**
* Configuration key to cache block policy (Lru, TinyLfu, AdaptiveLRU, IndexOnlyLRU).
*/
public static final String BLOCKCACHE_POLICY_KEY = "hfile.block.cache.policy";
public static final String BLOCKCACHE_POLICY_DEFAULT = "LRU";
/**
* If the chosen ioengine can persist its state across restarts, the path to the file to persist
* to. This file is NOT the data file. It is a file into which we will serialize the map of
* what is in the data file. For example, if you pass the following argument as
* BUCKET_CACHE_IOENGINE_KEY ("hbase.bucketcache.ioengine"),
* file:/tmp/bucketcache.data , then we will write the bucketcache data to the file
* /tmp/bucketcache.data but the metadata on where the data is in the supplied file
* is an in-memory map that needs to be persisted across restarts. Where to store this
* in-memory state is what you supply here: e.g. /tmp/bucketcache.map.
*/
public static final String BUCKET_CACHE_PERSISTENT_PATH_KEY = "hbase.bucketcache.persistent.path";
public static final String BUCKET_CACHE_WRITER_THREADS_KEY = "hbase.bucketcache.writer.threads";
public static final String BUCKET_CACHE_WRITER_QUEUE_KEY = "hbase.bucketcache.writer.queuelength";
/**
* A comma-delimited array of values for use as bucket sizes.
*/
public static final String BUCKET_CACHE_BUCKETS_KEY = "hbase.bucketcache.bucket.sizes";
/**
* Defaults for Bucket cache
*/
public static final int DEFAULT_BUCKET_CACHE_WRITER_THREADS = 3;
public static final int DEFAULT_BUCKET_CACHE_WRITER_QUEUE = 64;
/**
* The target block size used by blockcache instances. Defaults to
* {@link HConstants#DEFAULT_BLOCKSIZE}.
*/
public static final String BLOCKCACHE_BLOCKSIZE_KEY = "hbase.blockcache.minblocksize";
private static final String EXTERNAL_BLOCKCACHE_KEY = "hbase.blockcache.use.external";
private static final boolean EXTERNAL_BLOCKCACHE_DEFAULT = false;
private static final String EXTERNAL_BLOCKCACHE_CLASS_KEY = "hbase.blockcache.external.class";
/**
* @deprecated use {@link BlockCacheFactory#BLOCKCACHE_BLOCKSIZE_KEY} instead.
*/
@Deprecated
static final String DEPRECATED_BLOCKCACHE_BLOCKSIZE_KEY = "hbase.offheapcache.minblocksize";
/**
* The config point hbase.offheapcache.minblocksize is completely wrong, which is replaced by
* {@link BlockCacheFactory#BLOCKCACHE_BLOCKSIZE_KEY}. Keep the old config key here for backward
* compatibility.
*/
static {
Configuration.addDeprecation(DEPRECATED_BLOCKCACHE_BLOCKSIZE_KEY, BLOCKCACHE_BLOCKSIZE_KEY);
}
private BlockCacheFactory() {
}
public static BlockCache createBlockCache(Configuration conf) {
if (conf.get(DEPRECATED_BLOCKCACHE_BLOCKSIZE_KEY) != null) {
LOG.warn("The config key {} is deprecated now, instead please use {}. In future release "
+ "we will remove the deprecated config.", DEPRECATED_BLOCKCACHE_BLOCKSIZE_KEY,
BLOCKCACHE_BLOCKSIZE_KEY);
}
FirstLevelBlockCache l1Cache = createFirstLevelCache(conf);
if (l1Cache == null) {
return null;
}
boolean useExternal = conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
if (useExternal) {
BlockCache l2CacheInstance = createExternalBlockcache(conf);
return l2CacheInstance == null ?
l1Cache :
new InclusiveCombinedBlockCache(l1Cache, l2CacheInstance);
} else {
// otherwise use the bucket cache.
BucketCache bucketCache = createBucketCache(conf);
if (!conf.getBoolean("hbase.bucketcache.combinedcache.enabled", true)) {
// Non combined mode is off from 2.0
LOG.warn(
"From HBase 2.0 onwards only combined mode of LRU cache and bucket cache is available");
}
return bucketCache == null ? l1Cache : new CombinedBlockCache(l1Cache, bucketCache);
}
}
private static FirstLevelBlockCache createFirstLevelCache(final Configuration c) {
final long cacheSize = MemorySizeUtil.getOnHeapCacheSize(c);
if (cacheSize < 0) {
return null;
}
String policy = c.get(BLOCKCACHE_POLICY_KEY, BLOCKCACHE_POLICY_DEFAULT);
int blockSize = c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);
LOG.info("Allocating BlockCache size=" +
StringUtils.byteDesc(cacheSize) + ", blockSize=" + StringUtils.byteDesc(blockSize));
if (policy.equalsIgnoreCase("LRU")) {
return new LruBlockCache(cacheSize, blockSize, true, c);
} else if (policy.equalsIgnoreCase("IndexOnlyLRU")) {
return new IndexOnlyLruBlockCache(cacheSize, blockSize, true, c);
} else if (policy.equalsIgnoreCase("TinyLFU")) {
return new TinyLfuBlockCache(cacheSize, blockSize, ForkJoinPool.commonPool(), c);
} else if (policy.equalsIgnoreCase("AdaptiveLRU")) {
return new LruAdaptiveBlockCache(cacheSize, blockSize, true, c);
} else {
throw new IllegalArgumentException("Unknown policy: " + policy);
}
}
/**
* Enum of all built in external block caches.
* This is used for config.
*/
private static enum ExternalBlockCaches {
memcached("org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache");
// TODO(eclark): Consider more. Redis, etc.
Class clazz;
ExternalBlockCaches(String clazzName) {
try {
clazz = (Class) Class.forName(clazzName);
} catch (ClassNotFoundException cnef) {
clazz = null;
}
}
ExternalBlockCaches(Class clazz) {
this.clazz = clazz;
}
}
private static BlockCache createExternalBlockcache(Configuration c) {
if (LOG.isDebugEnabled()) {
LOG.debug("Trying to use External l2 cache");
}
Class klass = null;
// Get the class, from the config. s
try {
klass = ExternalBlockCaches
.valueOf(c.get(EXTERNAL_BLOCKCACHE_CLASS_KEY, "memcache")).clazz;
} catch (IllegalArgumentException exception) {
try {
klass = c.getClass(EXTERNAL_BLOCKCACHE_CLASS_KEY, Class.forName(
"org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache"));
} catch (ClassNotFoundException e) {
return null;
}
}
// Now try and create an instance of the block cache.
try {
LOG.info("Creating external block cache of type: " + klass);
return (BlockCache) ReflectionUtils.newInstance(klass, c);
} catch (Exception e) {
LOG.warn("Error creating external block cache", e);
}
return null;
}
private static BucketCache createBucketCache(Configuration c) {
// Check for L2. ioengine name must be non-null.
String bucketCacheIOEngineName = c.get(BUCKET_CACHE_IOENGINE_KEY, null);
if (bucketCacheIOEngineName == null || bucketCacheIOEngineName.length() <= 0) {
return null;
}
int blockSize = c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);
final long bucketCacheSize = MemorySizeUtil.getBucketCacheSize(c);
if (bucketCacheSize <= 0) {
throw new IllegalStateException("bucketCacheSize <= 0; Check " +
BUCKET_CACHE_SIZE_KEY + " setting and/or server java heap size");
}
if (c.get("hbase.bucketcache.percentage.in.combinedcache") != null) {
LOG.warn("Configuration 'hbase.bucketcache.percentage.in.combinedcache' is no longer "
+ "respected. See comments in http://hbase.apache.org/book.html#_changes_of_note");
}
int writerThreads = c.getInt(BUCKET_CACHE_WRITER_THREADS_KEY,
DEFAULT_BUCKET_CACHE_WRITER_THREADS);
int writerQueueLen = c.getInt(BUCKET_CACHE_WRITER_QUEUE_KEY,
DEFAULT_BUCKET_CACHE_WRITER_QUEUE);
String persistentPath = c.get(BUCKET_CACHE_PERSISTENT_PATH_KEY);
String[] configuredBucketSizes = c.getStrings(BUCKET_CACHE_BUCKETS_KEY);
int [] bucketSizes = null;
if (configuredBucketSizes != null) {
bucketSizes = new int[configuredBucketSizes.length];
for (int i = 0; i < configuredBucketSizes.length; i++) {
int bucketSize = Integer.parseInt(configuredBucketSizes[i].trim());
if (bucketSize % 256 != 0) {
// We need all the bucket sizes to be multiples of 256. Having all the configured bucket
// sizes to be multiples of 256 will ensure that the block offsets within buckets,
// that are calculated, will also be multiples of 256.
// See BucketEntry where offset to each block is represented using 5 bytes (instead of 8
// bytes long). We would like to save heap overhead as less as possible.
throw new IllegalArgumentException("Illegal value: " + bucketSize + " configured for '"
+ BUCKET_CACHE_BUCKETS_KEY + "'. All bucket sizes to be multiples of 256");
}
bucketSizes[i] = bucketSize;
}
}
BucketCache bucketCache = null;
try {
int ioErrorsTolerationDuration = c.getInt(
"hbase.bucketcache.ioengine.errors.tolerated.duration",
BucketCache.DEFAULT_ERROR_TOLERATION_DURATION);
// Bucket cache logs its stats on creation internal to the constructor.
bucketCache = new BucketCache(bucketCacheIOEngineName,
bucketCacheSize, blockSize, bucketSizes, writerThreads, writerQueueLen, persistentPath,
ioErrorsTolerationDuration, c);
} catch (IOException ioex) {
LOG.error("Can't instantiate bucket cache", ioex); throw new RuntimeException(ioex);
}
return bucketCache;
}
}
