HBASE-13170 Allow block cache to be external
Summary: Add MemcachedBlockCache Test Plan: Tested locally with PE and running memcached. Subscribers: rajesh.nishtala, ndimiduk Differential Revision: https://reviews.facebook.net/D34635
This commit is contained in:
Elliott Clark
parent
2fd6f2a829
commit
2857b21eaf
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@ -471,6 +471,11 @@
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<groupId>io.netty</groupId>
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<artifactId>netty-all</artifactId>
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</dependency>
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<dependency>
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<groupId>net.spy</groupId>
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<artifactId>spymemcached</artifactId>
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<optional>true</optional>
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</dependency>
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<!-- tracing Dependencies -->
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<dependency>
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<groupId>org.apache.htrace</groupId>
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@ -206,6 +206,38 @@ org.apache.hadoop.util.StringUtils;
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</%if>
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</%def>
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<%def hits_tmpl>
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<%args>
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BlockCache bc;
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</%args>
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<tr>
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<td>Hits</td>
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<td><% String.format("%,d", bc.getStats().getHitCount()) %></td>
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<td>Number requests that were cache hits</td>
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</tr>
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<tr>
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<td>Hits Caching</td>
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<td><% String.format("%,d", bc.getStats().getHitCachingCount()) %></td>
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<td>Cache hit block requests but only requests set to cache block if a miss</td>
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</tr>
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<tr>
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<td>Misses</td>
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<td><% String.format("%,d", bc.getStats().getMissCount()) %></td>
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<td>Block requests that were cache misses but set to cache missed blocks</td>
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</tr>
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<tr>
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<td>Misses Caching</td>
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<td><% String.format("%,d", bc.getStats().getMissCount()) %></td>
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<td>Block requests that were cache misses but only requests set to use block cache</td>
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</tr>
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<tr>
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<td>Hit Ratio</td>
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<td><% String.format("%,.2f", bc.getStats().getHitRatio() * 100) %><% "%" %></td>
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<td>Hit Count divided by total requests count</td>
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</tr>
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</%def>
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<%def bc_stats>
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<%args>
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CacheConfig cacheConfig;
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@ -235,31 +267,7 @@ org.apache.hadoop.util.StringUtils;
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<td>Number of blocks in block cache</td>
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</tr>
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<& evictions_tmpl; bc = cacheConfig.getBlockCache(); &>
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<tr>
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<td>Hits</td>
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<td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getHitCount()) %></td>
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<td>Number requests that were cache hits</td>
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</tr>
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<tr>
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<td>Hits Caching</td>
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<td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getHitCachingCount()) %></td>
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<td>Cache hit block requests but only requests set to cache block if a miss</td>
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</tr>
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<tr>
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<td>Misses</td>
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<td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getMissCount()) %></td>
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<td>Block requests that were cache misses but set to cache missed blocks</td>
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</tr>
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<tr>
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<td>Misses Caching</td>
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<td><% String.format("%,d", cacheConfig.getBlockCache().getStats().getMissCount()) %></td>
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<td>Block requests that were cache misses but only requests set to use block cache</td>
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</tr>
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<tr>
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<td>Hit Ratio</td>
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<td><% String.format("%,.2f", cacheConfig.getBlockCache().getStats().getHitRatio() * 100) %><% "%" %></td>
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<td>Hit Count divided by total requests count</td>
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</tr>
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<& hits_tmpl; bc = cacheConfig.getBlockCache(); &>
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</table>
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<p>If block cache is made up of more than one cache -- i.e. a L1 and a L2 -- then the above
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are combined counts. Request count is sum of hits and misses.</p>
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@ -349,7 +357,9 @@ are combined counts. Request count is sum of hits and misses.</p>
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<td>Size of DATA Blocks</td>
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</tr>
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</%if>
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<%if evictions %><& evictions_tmpl; bc = bc; &></%if>
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<& evictions_tmpl; bc = bc; &>
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<& hits_tmpl; bc = bc; &>
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<%if bucketCache %>
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<tr>
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<td>Hits per Second</td>
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@ -32,6 +32,7 @@ import org.apache.hadoop.hbase.HColumnDescriptor;
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import org.apache.hadoop.hbase.HConstants;
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import org.apache.hadoop.hbase.io.hfile.BlockType.BlockCategory;
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import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
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import org.apache.hadoop.hbase.util.ReflectionUtils;
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import org.apache.hadoop.util.StringUtils;
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import com.google.common.annotations.VisibleForTesting;
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@ -126,8 +127,25 @@ public class CacheConfig {
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*/
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public static final String BLOCKCACHE_BLOCKSIZE_KEY = "hbase.offheapcache.minblocksize";
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// Defaults
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private static final String EXTERNAL_BLOCKCACHE_KEY = "hbase.blockcache.use.external";
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private static final boolean EXTERNAL_BLOCKCACHE_DEFAULT = false;
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private static final String EXTERNAL_BLOCKCACHE_CLASS_KEY="hbase.blockcache.external.class";
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/**
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* Enum of all built in external block caches.
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* This is used for config.
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*/
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private static enum ExternalBlockCaches {
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memcached(MemcachedBlockCache.class);
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// TODO(eclark): Consider more. Redis, etc.
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Class<? extends BlockCache> clazz;
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ExternalBlockCaches(Class<? extends BlockCache> clazz) {
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this.clazz = clazz;
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}
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}
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// Defaults
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public static final boolean DEFAULT_CACHE_DATA_ON_READ = true;
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public static final boolean DEFAULT_CACHE_DATA_ON_WRITE = false;
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public static final boolean DEFAULT_IN_MEMORY = false;
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@ -478,7 +496,44 @@ public class CacheConfig {
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* @return Returns L2 block cache instance (for now it is BucketCache BlockCache all the time)
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* or null if not supposed to be a L2.
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*/
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private static BucketCache getL2(final Configuration c, final MemoryUsage mu) {
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private static BlockCache getL2(final Configuration c, final MemoryUsage mu) {
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final boolean useExternal = c.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
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if (LOG.isDebugEnabled()) {
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LOG.debug("Trying to use " + (useExternal?" External":" Internal") + " l2 cache");
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}
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// If we want to use an external block cache then create that.
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if (useExternal) {
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return getExternalBlockcache(c);
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}
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// otherwise use the bucket cache.
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return getBucketCache(c, mu);
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}
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private static BlockCache getExternalBlockcache(Configuration c) {
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Class klass = null;
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// Get the class, from the config. s
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try {
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klass = ExternalBlockCaches.valueOf(c.get(EXTERNAL_BLOCKCACHE_CLASS_KEY, "memcache")).clazz;
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} catch (IllegalArgumentException exception) {
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klass = c.getClass(EXTERNAL_BLOCKCACHE_CLASS_KEY, MemcachedBlockCache.class);
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}
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// Now try and create an instance of the block cache.
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try {
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LOG.info("Creating external block cache of type: " + klass);
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return (BlockCache) ReflectionUtils.newInstance(klass, c);
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} catch (Exception e) {
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LOG.warn("Error creating external block cache", e);
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}
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return null;
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}
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private static BlockCache getBucketCache(Configuration c, MemoryUsage mu) {
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// Check for L2. ioengine name must be non-null.
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String bucketCacheIOEngineName = c.get(BUCKET_CACHE_IOENGINE_KEY, null);
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if (bucketCacheIOEngineName == null || bucketCacheIOEngineName.length() <= 0) return null;
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@ -533,12 +588,16 @@ public class CacheConfig {
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LruBlockCache l1 = getL1(conf, mu);
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// blockCacheDisabled is set as a side-effect of getL1(), so check it again after the call.
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if (blockCacheDisabled) return null;
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BucketCache l2 = getL2(conf, mu);
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BlockCache l2 = getL2(conf, mu);
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if (l2 == null) {
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GLOBAL_BLOCK_CACHE_INSTANCE = l1;
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} else {
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boolean useExternal = conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
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boolean combinedWithLru = conf.getBoolean(BUCKET_CACHE_COMBINED_KEY,
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DEFAULT_BUCKET_CACHE_COMBINED);
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if (useExternal) {
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GLOBAL_BLOCK_CACHE_INSTANCE = new InclusiveCombinedBlockCache(l1, l2);
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} else {
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if (combinedWithLru) {
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GLOBAL_BLOCK_CACHE_INSTANCE = new CombinedBlockCache(l1, l2);
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} else {
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@ -546,10 +605,11 @@ public class CacheConfig {
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// mechanism. It is a little ugly but works according to the following: when the
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// background eviction thread runs, blocks evicted from L1 will go to L2 AND when we get
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// a block from the L1 cache, if not in L1, we will search L2.
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l1.setVictimCache(l2);
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GLOBAL_BLOCK_CACHE_INSTANCE = l1;
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}
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}
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l1.setVictimCache(l2);
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}
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return GLOBAL_BLOCK_CACHE_INSTANCE;
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}
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}
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@ -25,32 +25,37 @@ import org.apache.hadoop.hbase.io.HeapSize;
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import org.apache.hadoop.hbase.io.hfile.BlockType.BlockCategory;
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import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
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/**
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* CombinedBlockCache is an abstraction layer that combines
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* {@link LruBlockCache} and {@link BucketCache}. The smaller lruCache is used
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* to cache bloom blocks and index blocks. The larger bucketCache is used to
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* to cache bloom blocks and index blocks. The larger l2Cache is used to
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* cache data blocks. {@link #getBlock(BlockCacheKey, boolean, boolean, boolean)} reads
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* first from the smaller lruCache before looking for the block in the bucketCache. Blocks evicted
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* first from the smaller lruCache before looking for the block in the l2Cache. Blocks evicted
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* from lruCache are put into the bucket cache.
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* Metrics are the combined size and hits and misses of both caches.
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*
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*/
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@InterfaceAudience.Private
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public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
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private final LruBlockCache lruCache;
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private final BucketCache bucketCache;
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private final CombinedCacheStats combinedCacheStats;
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protected final LruBlockCache lruCache;
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protected final BlockCache l2Cache;
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protected final CombinedCacheStats combinedCacheStats;
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public CombinedBlockCache(LruBlockCache lruCache, BucketCache bucketCache) {
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public CombinedBlockCache(LruBlockCache lruCache, BlockCache l2Cache) {
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this.lruCache = lruCache;
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this.bucketCache = bucketCache;
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this.l2Cache = l2Cache;
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this.combinedCacheStats = new CombinedCacheStats(lruCache.getStats(),
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bucketCache.getStats());
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l2Cache.getStats());
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}
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@Override
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public long heapSize() {
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return lruCache.heapSize() + bucketCache.heapSize();
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long l2size = 0;
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if (l2Cache instanceof HeapSize) {
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l2size = ((HeapSize) l2Cache).heapSize();
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}
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return lruCache.heapSize() + l2size;
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}
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@Override
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@ -60,7 +65,7 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
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if (isMetaBlock || cacheDataInL1) {
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lruCache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
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} else {
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bucketCache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
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l2Cache.cacheBlock(cacheKey, buf, inMemory, false);
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}
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}
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@ -73,22 +78,24 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
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public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,
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boolean repeat, boolean updateCacheMetrics) {
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// TODO: is there a hole here, or just awkwardness since in the lruCache getBlock
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// we end up calling bucketCache.getBlock.
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// we end up calling l2Cache.getBlock.
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if (lruCache.containsBlock(cacheKey)) {
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return lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
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}
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return bucketCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
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Cacheable result = l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
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return result;
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}
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@Override
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public boolean evictBlock(BlockCacheKey cacheKey) {
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return lruCache.evictBlock(cacheKey) || bucketCache.evictBlock(cacheKey);
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return lruCache.evictBlock(cacheKey) || l2Cache.evictBlock(cacheKey);
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}
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@Override
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public int evictBlocksByHfileName(String hfileName) {
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return lruCache.evictBlocksByHfileName(hfileName)
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+ bucketCache.evictBlocksByHfileName(hfileName);
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+ l2Cache.evictBlocksByHfileName(hfileName);
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}
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@Override
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@ -99,27 +106,27 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
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@Override
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public void shutdown() {
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lruCache.shutdown();
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bucketCache.shutdown();
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l2Cache.shutdown();
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}
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@Override
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public long size() {
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return lruCache.size() + bucketCache.size();
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return lruCache.size() + l2Cache.size();
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}
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@Override
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public long getFreeSize() {
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return lruCache.getFreeSize() + bucketCache.getFreeSize();
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return lruCache.getFreeSize() + l2Cache.getFreeSize();
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}
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@Override
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public long getCurrentSize() {
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return lruCache.getCurrentSize() + bucketCache.getCurrentSize();
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return lruCache.getCurrentSize() + l2Cache.getCurrentSize();
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}
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@Override
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public long getBlockCount() {
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return lruCache.getBlockCount() + bucketCache.getBlockCount();
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return lruCache.getBlockCount() + l2Cache.getBlockCount();
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}
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private static class CombinedCacheStats extends CacheStats {
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@ -205,7 +212,7 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
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@Override
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public BlockCache[] getBlockCaches() {
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return new BlockCache [] {this.lruCache, this.bucketCache};
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return new BlockCache [] {this.lruCache, this.l2Cache};
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}
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@Override
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@ -116,7 +116,7 @@ public class HFileBlock implements Cacheable {
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*/
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static final int CHECKSUM_SIZE = Bytes.SIZEOF_INT;
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private static final CacheableDeserializer<Cacheable> blockDeserializer =
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static final CacheableDeserializer<Cacheable> blockDeserializer =
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new CacheableDeserializer<Cacheable>() {
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public HFileBlock deserialize(ByteBuffer buf, boolean reuse) throws IOException{
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buf.limit(buf.limit() - HFileBlock.EXTRA_SERIALIZATION_SPACE).rewind();
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@ -130,13 +130,13 @@ public class HFileBlock implements Cacheable {
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buf.position(buf.limit());
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buf.limit(buf.limit() + HFileBlock.EXTRA_SERIALIZATION_SPACE);
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boolean usesChecksum = buf.get() == (byte)1;
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HFileBlock ourBuffer = new HFileBlock(newByteBuffer, usesChecksum);
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ourBuffer.offset = buf.getLong();
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ourBuffer.nextBlockOnDiskSizeWithHeader = buf.getInt();
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if (ourBuffer.hasNextBlockHeader()) {
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ourBuffer.buf.limit(ourBuffer.buf.limit() - ourBuffer.headerSize());
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HFileBlock hFileBlock = new HFileBlock(newByteBuffer, usesChecksum);
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hFileBlock.offset = buf.getLong();
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hFileBlock.nextBlockOnDiskSizeWithHeader = buf.getInt();
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if (hFileBlock.hasNextBlockHeader()) {
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hFileBlock.buf.limit(hFileBlock.buf.limit() - hFileBlock.headerSize());
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}
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return ourBuffer;
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return hFileBlock;
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}
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@Override
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@ -671,7 +671,7 @@ public class HFileBlock implements Cacheable {
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* @return true if succeeded reading the extra bytes
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* @throws IOException if failed to read the necessary bytes
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*/
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public static boolean readWithExtra(InputStream in, byte buf[],
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public static boolean readWithExtra(InputStream in, byte[] buf,
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int bufOffset, int necessaryLen, int extraLen) throws IOException {
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int bytesRemaining = necessaryLen + extraLen;
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while (bytesRemaining > 0) {
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@ -777,7 +777,8 @@ public class HFileBlock implements Cacheable {
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/**
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* Valid in the READY state. Contains the header and the uncompressed (but
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* potentially encoded, if this is a data block) bytes, so the length is
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* {@link #uncompressedSizeWithoutHeader} + {@link org.apache.hadoop.hbase.HConstants#HFILEBLOCK_HEADER_SIZE}.
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* {@link #uncompressedSizeWithoutHeader} +
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* {@link org.apache.hadoop.hbase.HConstants#HFILEBLOCK_HEADER_SIZE}.
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* Does not store checksums.
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*/
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private byte[] uncompressedBytesWithHeader;
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@ -1060,7 +1061,9 @@ public class HFileBlock implements Cacheable {
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*/
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int getOnDiskSizeWithoutHeader() {
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expectState(State.BLOCK_READY);
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return onDiskBytesWithHeader.length + onDiskChecksum.length - HConstants.HFILEBLOCK_HEADER_SIZE;
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return onDiskBytesWithHeader.length
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+ onDiskChecksum.length
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- HConstants.HFILEBLOCK_HEADER_SIZE;
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}
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/**
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@ -1820,7 +1823,8 @@ public class HFileBlock implements Cacheable {
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if (!fileContext.isUseHBaseChecksum() || this.fileContext.getBytesPerChecksum() == 0) {
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return 0;
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}
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return (int)ChecksumUtil.numBytes(onDiskDataSizeWithHeader, this.fileContext.getBytesPerChecksum());
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return (int) ChecksumUtil.numBytes(onDiskDataSizeWithHeader,
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this.fileContext.getBytesPerChecksum());
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}
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/**
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@ -1874,8 +1878,8 @@ public class HFileBlock implements Cacheable {
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byte[] magicBuf = new byte[Math.min(buf.limit() - buf.position(), BlockType.MAGIC_LENGTH)];
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buf.get(magicBuf);
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BlockType bt = BlockType.parse(magicBuf, 0, BlockType.MAGIC_LENGTH);
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int compressedBlockSizeNoHeader = buf.getInt();;
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int uncompressedBlockSizeNoHeader = buf.getInt();;
|
||||
int compressedBlockSizeNoHeader = buf.getInt();
|
||||
int uncompressedBlockSizeNoHeader = buf.getInt();
|
||||
long prevBlockOffset = buf.getLong();
|
||||
byte cksumtype = buf.get();
|
||||
long bytesPerChecksum = buf.getInt();
|
||||
|
|
|
|||
|
|
@ -0,0 +1,58 @@
|
|||
/**
|
||||
* Copyright The Apache Software Foundation
|
||||
*
|
||||
* 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 org.apache.hadoop.hbase.HBaseInterfaceAudience;
|
||||
import org.apache.hadoop.hbase.classification.InterfaceAudience;
|
||||
|
||||
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
|
||||
public class InclusiveCombinedBlockCache extends CombinedBlockCache implements BlockCache {
|
||||
public InclusiveCombinedBlockCache(LruBlockCache l1, BlockCache l2) {
|
||||
super(l1,l2);
|
||||
}
|
||||
|
||||
@Override
|
||||
public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,
|
||||
boolean repeat, boolean updateCacheMetrics) {
|
||||
// On all external cache set ups the lru should have the l2 cache set as the victimHandler
|
||||
// Because of that all requests that miss inside of the lru block cache will be
|
||||
// tried in the l2 block cache.
|
||||
return lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
* @param cacheKey The block's cache key.
|
||||
* @param buf The block contents wrapped in a ByteBuffer.
|
||||
* @param inMemory Whether block should be treated as in-memory. This parameter is only useful for
|
||||
* the L1 lru cache.
|
||||
* @param cacheDataInL1 This is totally ignored.
|
||||
*/
|
||||
@Override
|
||||
public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
|
||||
final boolean cacheDataInL1) {
|
||||
// This is the inclusive part of the combined block cache.
|
||||
// Every block is placed into both block caches.
|
||||
lruCache.cacheBlock(cacheKey, buf, inMemory, true);
|
||||
|
||||
// This assumes that insertion into the L2 block cache is either async or very fast.
|
||||
l2Cache.cacheBlock(cacheKey, buf, inMemory, true);
|
||||
}
|
||||
}
|
||||
|
|
@ -199,8 +199,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
private boolean forceInMemory;
|
||||
|
||||
/** Where to send victims (blocks evicted/missing from the cache) */
|
||||
// TODO: Fix it so this is not explicit reference to a particular BlockCache implementation.
|
||||
private BucketCache victimHandler = null;
|
||||
private BlockCache victimHandler = null;
|
||||
|
||||
/**
|
||||
* Default constructor. Specify maximum size and expected average block
|
||||
|
|
@ -421,8 +420,17 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
LruCachedBlock cb = map.get(cacheKey);
|
||||
if (cb == null) {
|
||||
if (!repeat && updateCacheMetrics) stats.miss(caching);
|
||||
if (victimHandler != null) {
|
||||
return victimHandler.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
|
||||
// If there is another block cache then try and read there.
|
||||
// However if this is a retry ( second time in double checked locking )
|
||||
// And it's already a miss then the l2 will also be a miss.
|
||||
if (victimHandler != null && !repeat) {
|
||||
Cacheable result = victimHandler.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
|
||||
|
||||
// Promote this to L1.
|
||||
if (result != null && caching) {
|
||||
cacheBlock(cacheKey, result, /* inMemory = */ false, /* cacheData = */ true);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
|
@ -491,10 +499,14 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
}
|
||||
stats.evicted(block.getCachedTime());
|
||||
if (evictedByEvictionProcess && victimHandler != null) {
|
||||
if (victimHandler instanceof BucketCache) {
|
||||
boolean wait = getCurrentSize() < acceptableSize();
|
||||
boolean inMemory = block.getPriority() == BlockPriority.MEMORY;
|
||||
victimHandler.cacheBlockWithWait(block.getCacheKey(), block.getBuffer(),
|
||||
((BucketCache)victimHandler).cacheBlockWithWait(block.getCacheKey(), block.getBuffer(),
|
||||
inMemory, wait);
|
||||
} else {
|
||||
victimHandler.cacheBlock(block.getCacheKey(), block.getBuffer());
|
||||
}
|
||||
}
|
||||
return block.heapSize();
|
||||
}
|
||||
|
|
@ -789,7 +801,10 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
synchronized(this) {
|
||||
try {
|
||||
this.wait(1000 * 10/*Don't wait for ever*/);
|
||||
} catch(InterruptedException e) {}
|
||||
} catch(InterruptedException e) {
|
||||
LOG.warn("Interrupted eviction thread ", e);
|
||||
Thread.currentThread().interrupt();
|
||||
}
|
||||
}
|
||||
LruBlockCache cache = this.cache.get();
|
||||
if (cache == null) break;
|
||||
|
|
@ -1059,7 +1074,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
return counts;
|
||||
}
|
||||
|
||||
public void setVictimCache(BucketCache handler) {
|
||||
public void setVictimCache(BlockCache handler) {
|
||||
assert victimHandler == null;
|
||||
victimHandler = handler;
|
||||
}
|
||||
|
|
@ -1069,7 +1084,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
|
|||
return map;
|
||||
}
|
||||
|
||||
BucketCache getVictimHandler() {
|
||||
BlockCache getVictimHandler() {
|
||||
return this.victimHandler;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,272 @@
|
|||
/**
|
||||
* Copyright The Apache Software Foundation
|
||||
*
|
||||
* 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 net.spy.memcached.CachedData;
|
||||
import net.spy.memcached.ConnectionFactoryBuilder;
|
||||
import net.spy.memcached.FailureMode;
|
||||
import net.spy.memcached.MemcachedClient;
|
||||
import net.spy.memcached.transcoders.Transcoder;
|
||||
import org.apache.commons.logging.Log;
|
||||
import org.apache.commons.logging.LogFactory;
|
||||
import org.apache.hadoop.conf.Configuration;
|
||||
import org.apache.hadoop.hbase.HConstants;
|
||||
import org.apache.hadoop.hbase.classification.InterfaceAudience;
|
||||
import org.apache.hadoop.hbase.util.Addressing;
|
||||
import org.apache.htrace.Trace;
|
||||
import org.apache.htrace.TraceScope;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.net.InetSocketAddress;
|
||||
import java.nio.ByteBuffer;
|
||||
import java.util.ArrayList;
|
||||
import java.util.Iterator;
|
||||
import java.util.List;
|
||||
import java.util.NoSuchElementException;
|
||||
import java.util.concurrent.ExecutionException;
|
||||
|
||||
/**
|
||||
* Class to store blocks into memcached.
|
||||
* This should only be used on a cluster of Memcached daemons that are tuned well and have a
|
||||
* good network connection to the HBase regionservers. Any other use will likely slow down HBase
|
||||
* greatly.
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
public class MemcachedBlockCache implements BlockCache {
|
||||
private static final Log LOG = LogFactory.getLog(MemcachedBlockCache.class.getName());
|
||||
|
||||
// Some memcache versions won't take more than 1024 * 1024. So set the limit below
|
||||
// that just in case this client is used with those versions.
|
||||
public static final int MAX_SIZE = 1020 * 1024;
|
||||
|
||||
// Config key for what memcached servers to use.
|
||||
// They should be specified in a comma sperated list with ports.
|
||||
// like:
|
||||
//
|
||||
// host1:11211,host3:8080,host4:11211
|
||||
public static final String MEMCACHED_CONFIG_KEY = "hbase.cache.memcached.servers";
|
||||
public static final String MEMCACHED_TIMEOUT_KEY = "hbase.cache.memcached.timeout";
|
||||
public static final String MEMCACHED_OPTIMEOUT_KEY = "hbase.cache.memcached.optimeout";
|
||||
public static final long MEMCACHED_DEFAULT_TIMEOUT = 500;
|
||||
|
||||
private final MemcachedClient client;
|
||||
private final HFileBlockTranscoder tc = new HFileBlockTranscoder();
|
||||
private final CacheStats cacheStats = new CacheStats("MemcachedBlockCache");
|
||||
|
||||
public MemcachedBlockCache(Configuration c) throws IOException {
|
||||
LOG.info("Creating MemcachedBlockCache");
|
||||
|
||||
long opTimeout = c.getLong(MEMCACHED_OPTIMEOUT_KEY, MEMCACHED_DEFAULT_TIMEOUT);
|
||||
long queueTimeout = c.getLong(MEMCACHED_TIMEOUT_KEY, opTimeout + MEMCACHED_DEFAULT_TIMEOUT);
|
||||
|
||||
ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder()
|
||||
.setOpTimeout(opTimeout)
|
||||
.setOpQueueMaxBlockTime(queueTimeout) // Cap the max time before anything times out
|
||||
.setFailureMode(FailureMode.Redistribute)
|
||||
.setShouldOptimize(true) // When regions move lots of reads happen together
|
||||
// So combining them into single requests is nice.
|
||||
.setDaemon(true) // Don't keep threads around past the end of days.
|
||||
.setUseNagleAlgorithm(false) // Ain't nobody got time for that
|
||||
.setReadBufferSize(HConstants.DEFAULT_BLOCKSIZE * 4 * 1024); // 4 times larger than the
|
||||
// default block just in case
|
||||
|
||||
|
||||
// Assume only the localhost is serving memecached.
|
||||
// A la mcrouter or co-locating memcached with split regionservers.
|
||||
//
|
||||
// If this config is a pool of memecached servers they will all be used according to the
|
||||
// default hashing scheme defined by the memcache client. Spy Memecache client in this
|
||||
// case.
|
||||
String serverListString = c.get(MEMCACHED_CONFIG_KEY,"localhost:11211");
|
||||
String[] servers = serverListString.split(",");
|
||||
List<InetSocketAddress> serverAddresses = new ArrayList<InetSocketAddress>(servers.length);
|
||||
for (String s:servers) {
|
||||
serverAddresses.add(Addressing.createInetSocketAddressFromHostAndPortStr(s));
|
||||
}
|
||||
|
||||
client = new MemcachedClient(builder.build(), serverAddresses);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void cacheBlock(BlockCacheKey cacheKey,
|
||||
Cacheable buf,
|
||||
boolean inMemory,
|
||||
boolean cacheDataInL1) {
|
||||
cacheBlock(cacheKey, buf);
|
||||
}
|
||||
|
||||
@Override
|
||||
public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {
|
||||
if (buf instanceof HFileBlock) {
|
||||
client.add(cacheKey.toString(), MAX_SIZE, (HFileBlock) buf, tc);
|
||||
} else {
|
||||
if (LOG.isDebugEnabled()) {
|
||||
LOG.debug("MemcachedBlockCache can not cache Cacheable's of type "
|
||||
+ buf.getClass().toString());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,
|
||||
boolean repeat, boolean updateCacheMetrics) {
|
||||
// Assume that nothing is the block cache
|
||||
HFileBlock result = null;
|
||||
|
||||
try (TraceScope traceScope = Trace.startSpan("MemcachedBlockCache.getBlock")) {
|
||||
result = client.get(cacheKey.toString(), tc);
|
||||
} catch (Exception e) {
|
||||
// Catch a pretty broad set of exceptions to limit any changes in the memecache client
|
||||
// and how it handles failures from leaking into the read path.
|
||||
if (LOG.isDebugEnabled()) {
|
||||
LOG.debug("Exception pulling from memcached [ "
|
||||
+ cacheKey.toString()
|
||||
+ " ]. Treating as a miss.", e);
|
||||
}
|
||||
result = null;
|
||||
} finally {
|
||||
// Update stats if this request doesn't have it turned off 100% of the time
|
||||
if (updateCacheMetrics) {
|
||||
if (result == null) {
|
||||
cacheStats.miss(caching);
|
||||
} else {
|
||||
cacheStats.hit(caching);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean evictBlock(BlockCacheKey cacheKey) {
|
||||
try {
|
||||
cacheStats.evict();
|
||||
return client.delete(cacheKey.toString()).get();
|
||||
} catch (InterruptedException e) {
|
||||
LOG.warn("Error deleting " + cacheKey.toString(), e);
|
||||
Thread.currentThread().interrupt();
|
||||
} catch (ExecutionException e) {
|
||||
if (LOG.isDebugEnabled()) {
|
||||
LOG.debug("Error deleting " + cacheKey.toString(), e);
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* This method does nothing so that memcached can handle all evictions.
|
||||
*/
|
||||
@Override
|
||||
public int evictBlocksByHfileName(String hfileName) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
@Override
|
||||
public CacheStats getStats() {
|
||||
return cacheStats;
|
||||
}
|
||||
|
||||
@Override
|
||||
public void shutdown() {
|
||||
client.shutdown();
|
||||
}
|
||||
|
||||
@Override
|
||||
public long size() {
|
||||
return 0;
|
||||
}
|
||||
|
||||
@Override
|
||||
public long getFreeSize() {
|
||||
return 0;
|
||||
}
|
||||
|
||||
@Override
|
||||
public long getCurrentSize() {
|
||||
return 0;
|
||||
}
|
||||
|
||||
@Override
|
||||
public long getBlockCount() {
|
||||
return 0;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Iterator<CachedBlock> iterator() {
|
||||
return new Iterator<CachedBlock>() {
|
||||
@Override
|
||||
public boolean hasNext() {
|
||||
return false;
|
||||
}
|
||||
|
||||
@Override
|
||||
public CachedBlock next() {
|
||||
throw new NoSuchElementException("MemcachedBlockCache can't iterate over blocks.");
|
||||
}
|
||||
|
||||
@Override
|
||||
public void remove() {
|
||||
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
@Override
|
||||
public BlockCache[] getBlockCaches() {
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Class to encode and decode an HFileBlock to and from memecached's resulting byte arrays.
|
||||
*/
|
||||
private static class HFileBlockTranscoder implements Transcoder<HFileBlock> {
|
||||
|
||||
@Override
|
||||
public boolean asyncDecode(CachedData d) {
|
||||
return false;
|
||||
}
|
||||
|
||||
@Override
|
||||
public CachedData encode(HFileBlock block) {
|
||||
ByteBuffer bb = ByteBuffer.allocate(block.getSerializedLength());
|
||||
block.serialize(bb);
|
||||
return new CachedData(0, bb.array(), CachedData.MAX_SIZE);
|
||||
}
|
||||
|
||||
@Override
|
||||
public HFileBlock decode(CachedData d) {
|
||||
try {
|
||||
ByteBuffer buf = ByteBuffer.wrap(d.getData());
|
||||
return (HFileBlock) HFileBlock.blockDeserializer.deserialize(buf, true);
|
||||
} catch (IOException e) {
|
||||
LOG.warn("Error deserializing data from memcached",e);
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
@Override
|
||||
public int getMaxSize() {
|
||||
return MAX_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -282,9 +282,9 @@ public class TestCacheConfig {
|
|||
// TODO: Assert sizes allocated are right and proportions.
|
||||
LruBlockCache lbc = (LruBlockCache)cc.getBlockCache();
|
||||
assertEquals(lruExpectedSize, lbc.getMaxSize());
|
||||
BucketCache bc = lbc.getVictimHandler();
|
||||
BlockCache bc = lbc.getVictimHandler();
|
||||
// getMaxSize comes back in bytes but we specified size in MB
|
||||
assertEquals(bcExpectedSize, bc.getMaxSize());
|
||||
assertEquals(bcExpectedSize, ((BucketCache) bc).getMaxSize());
|
||||
// Test the L1+L2 deploy works as we'd expect with blocks evicted from L1 going to L2.
|
||||
long initialL1BlockCount = lbc.getBlockCount();
|
||||
long initialL2BlockCount = bc.getBlockCount();
|
||||
|
|
|
|||
7
pom.xml
7
pom.xml
|
|
@ -1100,6 +1100,7 @@
|
|||
<netty.version>4.0.23.Final</netty.version>
|
||||
<joni.version>2.1.2</joni.version>
|
||||
<jcodings.version>1.0.8</jcodings.version>
|
||||
<spy.version>2.11.6</spy.version>
|
||||
<!-- Plugin Dependencies -->
|
||||
<maven.assembly.version>2.4</maven.assembly.version>
|
||||
<maven.antrun.version>1.6</maven.antrun.version>
|
||||
|
|
@ -1602,6 +1603,12 @@
|
|||
<groupId>com.lmax</groupId>
|
||||
<artifactId>disruptor</artifactId>
|
||||
<version>${disruptor.version}</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>net.spy</groupId>
|
||||
<artifactId>spymemcached</artifactId>
|
||||
<version>${spy.version}</version>
|
||||
<optional>true</optional>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.jmock</groupId>
|
||||
|
|
|
|||
Loading…
Reference in New Issue