http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6b4bae59/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/CacheConfig.ExternalBlockCaches.html
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diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/CacheConfig.ExternalBlockCaches.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/CacheConfig.ExternalBlockCaches.html
index ad83c55..bff0679 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/CacheConfig.ExternalBlockCaches.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/CacheConfig.ExternalBlockCaches.html
@@ -291,435 +291,436 @@
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final boolean cacheIndexesOnWrite,<a name="line.303"></a>
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final boolean evictOnClose,<a name="line.304"></a>
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final boolean prefetchOnOpen,<a name="line.305"></a>
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cacheIndexesOnWrite;<a name="line.311"></a>
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cacheConf.evictOnClose,<a name="line.327"></a>
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+<span class="sourceLineNo">540</span>  // Static block cache reference and 
methods<a name="line.540"></a>
+<span class="sourceLineNo">541</span><a name="line.541"></a>
+<span class="sourceLineNo">542</span>  /**<a name="line.542"></a>
+<span class="sourceLineNo">543</span>   * Static reference to the block cache, 
or null if no caching should be used<a name="line.543"></a>
+<span class="sourceLineNo">544</span>   * at all.<a name="line.544"></a>
+<span class="sourceLineNo">545</span>   */<a name="line.545"></a>
+<span class="sourceLineNo">546</span>  // Clear this if in tests you'd make 
more than one block cache instance.<a name="line.546"></a>
+<span class="sourceLineNo">547</span>  @VisibleForTesting<a 
name="line.547"></a>
+<span class="sourceLineNo">548</span>  static BlockCache 
GLOBAL_BLOCK_CACHE_INSTANCE;<a name="line.548"></a>
+<span class="sourceLineNo">549</span>  private static LruBlockCache 
GLOBAL_L1_CACHE_INSTANCE;<a name="line.549"></a>
+<span class="sourceLineNo">550</span><a name="line.550"></a>
+<span class="sourceLineNo">551</span>  /** Boolean whether we have disabled 
the block cache entirely. */<a name="line.551"></a>
+<span class="sourceLineNo">552</span>  @VisibleForTesting<a 
name="line.552"></a>
+<span class="sourceLineNo">553</span>  static boolean blockCacheDisabled = 
false;<a name="line.553"></a>
+<span class="sourceLineNo">554</span><a name="line.554"></a>
+<span class="sourceLineNo">555</span>  /**<a name="line.555"></a>
+<span class="sourceLineNo">556</span>   * @param c Configuration to use.<a 
name="line.556"></a>
+<span class="sourceLineNo">557</span>   * @return An L1 instance.  Currently 
an instance of LruBlockCache.<a name="line.557"></a>
+<span class="sourceLineNo">558</span>   */<a name="line.558"></a>
+<span class="sourceLineNo">559</span>  public static LruBlockCache getL1(final 
Configuration c) {<a name="line.559"></a>
+<span class="sourceLineNo">560</span>    return getL1Internal(c);<a 
name="line.560"></a>
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+<span class="sourceLineNo">563</span>  /**<a name="line.563"></a>
+<span class="sourceLineNo">564</span>   * @param c Configuration to use.<a 
name="line.564"></a>
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an instance of LruBlockCache.<a name="line.565"></a>
+<span class="sourceLineNo">566</span>   */<a name="line.566"></a>
+<span class="sourceLineNo">567</span>  private synchronized static 
LruBlockCache getL1Internal(final Configuration c) {<a name="line.567"></a>
+<span class="sourceLineNo">568</span>    if (GLOBAL_L1_CACHE_INSTANCE != null) 
return GLOBAL_L1_CACHE_INSTANCE;<a name="line.568"></a>
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MemorySizeUtil.getLruCacheSize(c);<a name="line.569"></a>
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name="line.570"></a>
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name="line.571"></a>
+<span class="sourceLineNo">572</span>    }<a name="line.572"></a>
+<span class="sourceLineNo">573</span>    if (blockCacheDisabled) return 
null;<a name="line.573"></a>
+<span class="sourceLineNo">574</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.574"></a>
+<span class="sourceLineNo">575</span>    LOG.info("Allocating LruBlockCache 
size=" +<a name="line.575"></a>
+<span class="sourceLineNo">576</span>      StringUtils.byteDesc(lruCacheSize) 
+ ", blockSize=" + StringUtils.byteDesc(blockSize));<a name="line.576"></a>
+<span class="sourceLineNo">577</span>    GLOBAL_L1_CACHE_INSTANCE = new 
LruBlockCache(lruCacheSize, blockSize, true, c);<a name="line.577"></a>
+<span class="sourceLineNo">578</span>    return GLOBAL_L1_CACHE_INSTANCE;<a 
name="line.578"></a>
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+<span class="sourceLineNo">580</span><a name="line.580"></a>
+<span class="sourceLineNo">581</span>  /**<a name="line.581"></a>
+<span class="sourceLineNo">582</span>   * @param c Configuration to use.<a 
name="line.582"></a>
+<span class="sourceLineNo">583</span>   * @return Returns L2 block cache 
instance (for now it is BucketCache BlockCache all the time)<a 
name="line.583"></a>
+<span class="sourceLineNo">584</span>   * or null if not supposed to be a 
L2.<a name="line.584"></a>
+<span class="sourceLineNo">585</span>   */<a name="line.585"></a>
+<span class="sourceLineNo">586</span>  private static BlockCache getL2(final 
Configuration c) {<a name="line.586"></a>
+<span class="sourceLineNo">587</span>    final boolean useExternal = 
c.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);<a 
name="line.587"></a>
+<span class="sourceLineNo">588</span>    if (LOG.isDebugEnabled()) {<a 
name="line.588"></a>
+<span class="sourceLineNo">589</span>      LOG.debug("Trying to use " + 
(useExternal?" External":" Internal") + " l2 cache");<a name="line.589"></a>
+<span class="sourceLineNo">590</span>    }<a name="line.590"></a>
+<span class="sourceLineNo">591</span><a name="line.591"></a>
+<span class="sourceLineNo">592</span>    // If we want to use an external 
block cache then create that.<a name="line.592"></a>
+<span class="sourceLineNo">593</span>    if (useExternal) {<a 
name="line.593"></a>
+<span class="sourceLineNo">594</span>      return getExternalBlockcache(c);<a 
name="line.594"></a>
+<span class="sourceLineNo">595</span>    }<a name="line.595"></a>
+<span class="sourceLineNo">596</span><a name="line.596"></a>
+<span class="sourceLineNo">597</span>    // otherwise use the bucket cache.<a 
name="line.597"></a>
+<span class="sourceLineNo">598</span>    return getBucketCache(c);<a 
name="line.598"></a>
+<span class="sourceLineNo">599</span><a name="line.599"></a>
+<span class="sourceLineNo">600</span>  }<a name="line.600"></a>
+<span class="sourceLineNo">601</span><a name="line.601"></a>
+<span class="sourceLineNo">602</span>  private static BlockCache 
getExternalBlockcache(Configuration c) {<a name="line.602"></a>
+<span class="sourceLineNo">603</span>    Class klass = null;<a 
name="line.603"></a>
+<span class="sourceLineNo">604</span><a name="line.604"></a>
+<span class="sourceLineNo">605</span>    // Get the class, from the config. 
s<a name="line.605"></a>
+<span class="sourceLineNo">606</span>    try {<a name="line.606"></a>
+<span class="sourceLineNo">607</span>      klass = 
ExternalBlockCaches.valueOf(c.get(EXTERNAL_BLOCKCACHE_CLASS_KEY, 
"memcache")).clazz;<a name="line.607"></a>
+<span class="sourceLineNo">608</span>    } catch (IllegalArgumentException 
exception) {<a name="line.608"></a>
+<span class="sourceLineNo">609</span>      try {<a name="line.609"></a>
+<span class="sourceLineNo">610</span>        klass = 
c.getClass(EXTERNAL_BLOCKCACHE_CLASS_KEY, Class.forName(<a name="line.610"></a>
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"org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache"));<a name="line.611"></a>
+<span class="sourceLineNo">612</span>      } catch (ClassNotFoundException e) 
{<a name="line.612"></a>
+<span class="sourceLineNo">613</span>        return null;<a 
name="line.613"></a>
+<span class="sourceLineNo">614</span>      }<a name="line.614"></a>
+<span class="sourceLineNo">615</span>    }<a name="line.615"></a>
+<span class="sourceLineNo">616</span><a name="line.616"></a>
+<span class="sourceLineNo">617</span>    // Now try and create an instance of 
the block cache.<a name="line.617"></a>
+<span class="sourceLineNo">618</span>    try {<a name="line.618"></a>
+<span class="sourceLineNo">619</span>      LOG.info("Creating external block 
cache of type: " + klass);<a name="line.619"></a>
+<span class="sourceLineNo">620</span>      return (BlockCache) 
ReflectionUtils.newInstance(klass, c);<a name="line.620"></a>
+<span class="sourceLineNo">621</span>    } catch (Exception e) {<a 
name="line.621"></a>
+<span class="sourceLineNo">622</span>      LOG.warn("Error creating external 
block cache", e);<a name="line.622"></a>
+<span class="sourceLineNo">623</span>    }<a name="line.623"></a>
+<span class="sourceLineNo">624</span>    return null;<a name="line.624"></a>
+<span class="sourceLineNo">625</span><a name="line.625"></a>
+<span class="sourceLineNo">626</span>  }<a name="line.626"></a>
+<span class="sourceLineNo">627</span><a name="line.627"></a>
+<span class="sourceLineNo">628</span>  private static BlockCache 
getBucketCache(Configuration c) {<a name="line.628"></a>
+<span class="sourceLineNo">629</span>    // Check for L2.  ioengine name must 
be non-null.<a name="line.629"></a>
+<span class="sourceLineNo">630</span>    String bucketCacheIOEngineName = 
c.get(BUCKET_CACHE_IOENGINE_KEY, null);<a name="line.630"></a>
+<span class="sourceLineNo">631</span>    if (bucketCacheIOEngineName == null 
|| bucketCacheIOEngineName.length() &lt;= 0) return null;<a name="line.631"></a>
+<span class="sourceLineNo">632</span><a name="line.632"></a>
+<span class="sourceLineNo">633</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.633"></a>
+<span class="sourceLineNo">634</span>    final long bucketCacheSize = 
MemorySizeUtil.getBucketCacheSize(c);<a name="line.634"></a>
+<span class="sourceLineNo">635</span>    if (bucketCacheSize &lt;= 0) {<a 
name="line.635"></a>
+<span class="sourceLineNo">636</span>      throw new 
IllegalStateException("bucketCacheSize &lt;= 0; Check " +<a name="line.636"></a>
+<span class="sourceLineNo">637</span>        BUCKET_CACHE_SIZE_KEY + " setting 
and/or server java heap size");<a name="line.637"></a>
+<span class="sourceLineNo">638</span>    }<a name="line.638"></a>
+<span class="sourceLineNo">639</span>    if 
(c.get("hbase.bucketcache.percentage.in.combinedcache") != null) {<a 
name="line.639"></a>
+<span class="sourceLineNo">640</span>      LOG.warn("Configuration 
'hbase.bucketcache.percentage.in.combinedcache' is no longer "<a 
name="line.640"></a>
+<span class="sourceLineNo">641</span>          + "respected. See comments in 
http://hbase.apache.org/book.html#_changes_of_note";);<a name="line.641"></a>
+<span class="sourceLineNo">642</span>    }<a name="line.642"></a>
+<span class="sourceLineNo">643</span>    int writerThreads = 
c.getInt(BUCKET_CACHE_WRITER_THREADS_KEY,<a name="line.643"></a>
+<span class="sourceLineNo">644</span>      
DEFAULT_BUCKET_CACHE_WRITER_THREADS);<a name="line.644"></a>
+<span class="sourceLineNo">645</span>    int writerQueueLen = 
c.getInt(BUCKET_CACHE_WRITER_QUEUE_KEY,<a name="line.645"></a>
+<span class="sourceLineNo">646</span>      
DEFAULT_BUCKET_CACHE_WRITER_QUEUE);<a name="line.646"></a>
+<span class="sourceLineNo">647</span>    String persistentPath = 
c.get(BUCKET_CACHE_PERSISTENT_PATH_KEY);<a name="line.647"></a>
+<span class="sourceLineNo">648</span>    String[] configuredBucketSizes = 
c.getStrings(BUCKET_CACHE_BUCKETS_KEY);<a name="line.648"></a>
+<span class="sourceLineNo">649</span>    int [] bucketSizes = null;<a 
name="line.649"></a>
+<span class="sourceLineNo">650</span>    if (configuredBucketSizes != null) 
{<a name="line.650"></a>
+<span class="sourceLineNo">651</span>      bucketSizes = new 
int[configuredBucketSizes.length];<a name="line.651"></a>
+<span class="sourceLineNo">652</span>      for (int i = 0; i &lt; 
configuredBucketSizes.length; i++) {<a name="line.652"></a>
+<span class="sourceLineNo">653</span>        bucketSizes[i] = 
Integer.parseInt(configuredBucketSizes[i].trim());<a name="line.653"></a>
+<span class="sourceLineNo">654</span>      }<a name="line.654"></a>
+<span class="sourceLineNo">655</span>    }<a name="line.655"></a>
+<span class="sourceLineNo">656</span>    BucketCache bucketCache = null;<a 
name="line.656"></a>
+<span class="sourceLineNo">657</span>    try {<a name="line.657"></a>
+<span class="sourceLineNo">658</span>      int ioErrorsTolerationDuration = 
c.getInt(<a name="line.658"></a>
+<span class="sourceLineNo">659</span>        
"hbase.bucketcache.ioengine.errors.tolerated.duration",<a name="line.659"></a>
+<span class="sourceLineNo">660</span>        
BucketCache.DEFAULT_ERROR_TOLERATION_DURATION);<a name="line.660"></a>
+<span class="sourceLineNo">661</span>      // Bucket cache logs its stats on 
creation internal to the constructor.<a name="line.661"></a>
+<span class="sourceLineNo">662</span>      bucketCache = new 
BucketCache(bucketCacheIOEngineName,<a name="line.662"></a>
+<span class="sourceLineNo">663</span>        bucketCacheSize, blockSize, 
bucketSizes, writerThreads, writerQueueLen, persistentPath,<a 
name="line.663"></a>
+<span class="sourceLineNo">664</span>        ioErrorsTolerationDuration);<a 
name="line.664"></a>
+<span class="sourceLineNo">665</span>    } catch (IOException ioex) {<a 
name="line.665"></a>
+<span class="sourceLineNo">666</span>      LOG.error("Can't instantiate bucket 
cache", ioex); throw new RuntimeException(ioex);<a name="line.666"></a>
+<span class="sourceLineNo">667</span>    }<a name="line.667"></a>
+<span class="sourceLineNo">668</span>    return bucketCache;<a 
name="line.668"></a>
+<span class="sourceLineNo">669</span>  }<a name="line.669"></a>
+<span class="sourceLineNo">670</span><a name="line.670"></a>
+<span class="sourceLineNo">671</span>  /**<a name="line.671"></a>
+<span class="sourceLineNo">672</span>   * Returns the block cache or 
&lt;code&gt;null&lt;/code&gt; in case none should be used.<a 
name="line.672"></a>
+<span class="sourceLineNo">673</span>   * Sets GLOBAL_BLOCK_CACHE_INSTANCE<a 
name="line.673"></a>
+<span class="sourceLineNo">674</span>   *<a name="line.674"></a>
+<span class="sourceLineNo">675</span>   * @param conf  The current 
configuration.<a name="line.675"></a>
+<span class="sourceLineNo">676</span>   * @return The block cache or 
&lt;code&gt;null&lt;/code&gt;.<a name="line.676"></a>
+<span class="sourceLineNo">677</span>   */<a name="line.677"></a>
+<span class="sourceLineNo">678</span>  public static synchronized BlockCache 
instantiateBlockCache(Configuration conf) {<a name="line.678"></a>
+<span class="sourceLineNo">679</span>    if (GLOBAL_BLOCK_CACHE_INSTANCE != 
null) return GLOBAL_BLOCK_CACHE_INSTANCE;<a name="line.679"></a>
+<span class="sourceLineNo">680</span>    if (blockCacheDisabled) return 
null;<a name="line.680"></a>
+<span class="sourceLineNo">681</span>    LruBlockCache l1 = 
getL1Internal(conf);<a name="line.681"></a>
+<span class="sourceLineNo">682</span>    // blockCacheDisabled is set as a 
side-effect of getL1Internal(), so check it again after the call.<a 
name="line.682"></a>
+<span class="sourceLineNo">683</span>    if (blockCacheDisabled) return 
null;<a name="line.683"></a>
+<span class="sourceLineNo">684</span>    BlockCache l2 = getL2(conf);<a 
name="line.684"></a>
+<span class="sourceLineNo">685</span>    if (l2 == null) {<a 
name="line.685"></a>
+<span class="sourceLineNo">686</span>      GLOBAL_BLOCK_CACHE_INSTANCE = l1;<a 
name="line.686"></a>
+<span class="sourceLineNo">687</span>    } else {<a name="line.687"></a>
+<span class="sourceLineNo">688</span>      boolean useExternal = 
conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);<a 
name="line.688"></a>
+<span class="sourceLineNo">689</span>      boolean combinedWithLru = 
conf.getBoolean(BUCKET_CACHE_COMBINED_KEY,<a name="line.689"></a>
+<span class="sourceLineNo">690</span>        DEFAULT_BUCKET_CACHE_COMBINED);<a 
name="line.690"></a>
+<span class="sourceLineNo">691</span>      if (useExternal) {<a 
name="line.691"></a>
+<span class="sourceLineNo">692</span>        GLOBAL_BLOCK_CACHE_INSTANCE = new 
InclusiveCombinedBlockCache(l1, l2);<a name="line.692"></a>
+<span class="sourceLineNo">693</span>      } else {<a name="line.693"></a>
+<span class="sourceLineNo">694</span>        if (combinedWithLru) {<a 
name="line.694"></a>
+<span class="sourceLineNo">695</span>          GLOBAL_BLOCK_CACHE_INSTANCE = 
new CombinedBlockCache(l1, l2);<a name="line.695"></a>
+<span class="sourceLineNo">696</span>        } else {<a name="line.696"></a>
+<span class="sourceLineNo">697</span>          // L1 and L2 are not 
'combined'.  They are connected via the LruBlockCache victimhandler<a 
name="line.697"></a>
+<span class="sourceLineNo">698</span>          // mechanism.  It is a little 
ugly but works according to the following: when the<a name="line.698"></a>
+<span class="sourceLineNo">699</span>          // background eviction thread 
runs, blocks evicted from L1 will go to L2 AND when we get<a 
name="line.699"></a>
+<span class="sourceLineNo">700</span>          // a block from the L1 cache, 
if not in L1, we will search L2.<a name="line.700"></a>
+<span class="sourceLineNo">701</span>          GLOBAL_BLOCK_CACHE_INSTANCE = 
l1;<a name="line.701"></a>
+<span class="sourceLineNo">702</span>        }<a name="line.702"></a>
+<span class="sourceLineNo">703</span>      }<a name="line.703"></a>
+<span class="sourceLineNo">704</span>      l1.setVictimCache(l2);<a 
name="line.704"></a>
+<span class="sourceLineNo">705</span>    }<a name="line.705"></a>
+<span class="sourceLineNo">706</span>    return GLOBAL_BLOCK_CACHE_INSTANCE;<a 
name="line.706"></a>
+<span class="sourceLineNo">707</span>  }<a name="line.707"></a>
+<span class="sourceLineNo">708</span><a name="line.708"></a>
+<span class="sourceLineNo">709</span>  // Supposed to use only from tests. 
Some tests want to reinit the Global block cache instance<a name="line.709"></a>
+<span class="sourceLineNo">710</span>  @VisibleForTesting<a 
name="line.710"></a>
+<span class="sourceLineNo">711</span>  static synchronized void 
clearGlobalInstances() {<a name="line.711"></a>
+<span class="sourceLineNo">712</span>    GLOBAL_L1_CACHE_INSTANCE = null;<a 
name="line.712"></a>
+<span class="sourceLineNo">713</span>    GLOBAL_BLOCK_CACHE_INSTANCE = null;<a 
name="line.713"></a>
+<span class="sourceLineNo">714</span>  }<a name="line.714"></a>
+<span class="sourceLineNo">715</span>}<a name="line.715"></a>
 
 
 

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