HBASE-19357 Bucket cache no longer L2 for LRU cache.

hbase-client/src/main/java/org/apache/hadoop/hbase/HColumnDescriptor.java

@@ -52,7 +52,7 @@ public class HColumnDescriptor implements ColumnFamilyDescriptor, Comparable<HCo
   public static final String CACHE_INDEX_ON_WRITE = ColumnFamilyDescriptorBuilder.CACHE_INDEX_ON_WRITE;
   public static final String CACHE_BLOOMS_ON_WRITE = ColumnFamilyDescriptorBuilder.CACHE_BLOOMS_ON_WRITE;
   public static final String EVICT_BLOCKS_ON_CLOSE = ColumnFamilyDescriptorBuilder.EVICT_BLOCKS_ON_CLOSE;
-  public static final String CACHE_DATA_IN_L1 = ColumnFamilyDescriptorBuilder.CACHE_DATA_IN_L1;
+  public static final String CACHE_DATA_IN_L1 = "CACHE_DATA_IN_L1";
   public static final String PREFETCH_BLOCKS_ON_OPEN = ColumnFamilyDescriptorBuilder.PREFETCH_BLOCKS_ON_OPEN;
   public static final String BLOCKSIZE = ColumnFamilyDescriptorBuilder.BLOCKSIZE;
   public static final String LENGTH = "LENGTH";
@@ -87,7 +87,7 @@ public class HColumnDescriptor implements ColumnFamilyDescriptor, Comparable<HCo
   public static final KeepDeletedCells DEFAULT_KEEP_DELETED = ColumnFamilyDescriptorBuilder.DEFAULT_KEEP_DELETED;
   public static final boolean DEFAULT_BLOCKCACHE = ColumnFamilyDescriptorBuilder.DEFAULT_BLOCKCACHE;
   public static final boolean DEFAULT_CACHE_DATA_ON_WRITE = ColumnFamilyDescriptorBuilder.DEFAULT_CACHE_DATA_ON_WRITE;
-  public static final boolean DEFAULT_CACHE_DATA_IN_L1 = ColumnFamilyDescriptorBuilder.DEFAULT_CACHE_DATA_IN_L1;
+  public static final boolean DEFAULT_CACHE_DATA_IN_L1 = false;
   public static final boolean DEFAULT_CACHE_INDEX_ON_WRITE = ColumnFamilyDescriptorBuilder.DEFAULT_CACHE_INDEX_ON_WRITE;
   public static final int DEFAULT_BLOCKSIZE = ColumnFamilyDescriptorBuilder.DEFAULT_BLOCKSIZE;
   public static final String DEFAULT_BLOOMFILTER =  ColumnFamilyDescriptorBuilder.DEFAULT_BLOOMFILTER.name();
@@ -534,18 +534,16 @@ public class HColumnDescriptor implements ColumnFamilyDescriptor, Comparable<HCo
     return this;
   }
 
-  @Override
-  public boolean isCacheDataInL1() {
-    return delegatee.isCacheDataInL1();
-  }
-
   /**
-   * @param value true if we should cache data blocks in the L1 cache (if block cache deploy
+   * This is a noop call from HBase 2.0 onwards
-   * has more than one tier; e.g. we are using CombinedBlockCache).
+   *
    * @return this (for chained invocation)
+   * @deprecated Since 2.0 and will be removed in 3.0 with out any replacement. Caching data in on
+   *             heap Cache, when there are both on heap LRU Cache and Bucket Cache will no longer
+   *             be supported from 2.0.
    */
+  @Deprecated
   public HColumnDescriptor setCacheDataInL1(boolean value) {
-    getDelegateeForModification().setCacheDataInL1(value);
     return this;
   }
 

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ColumnFamilyDescriptor.java

@@ -202,11 +202,7 @@ public interface ColumnFamilyDescriptor {
    * @return true if we should cache bloomfilter blocks on write
    */
   boolean isCacheBloomsOnWrite();
-  /**
+
-   * @return true if we should cache data blocks in the L1 cache (if block cache deploy has more
-   *         than one tier; e.g. we are using CombinedBlockCache).
-   */
-  boolean isCacheDataInL1();
   /**
    * @return true if we should cache data blocks on write
    */

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ColumnFamilyDescriptorBuilder.java

@@ -98,14 +98,6 @@ public class ColumnFamilyDescriptorBuilder {
   @InterfaceAudience.Private
   public static final String EVICT_BLOCKS_ON_CLOSE = "EVICT_BLOCKS_ON_CLOSE";
   private static final Bytes EVICT_BLOCKS_ON_CLOSE_BYTES = new Bytes(Bytes.toBytes(EVICT_BLOCKS_ON_CLOSE));
-  /**
-   * Key for cache data into L1 if cache is set up with more than one tier. To
-   * set in the shell, do something like this:      <code>hbase(main):003:0&gt; create 't',
-   *    {NAME =&gt; 't', CONFIGURATION =&gt; {CACHE_DATA_IN_L1 =&gt; 'true'}}</code>
-   */
-  @InterfaceAudience.Private
-  public static final String CACHE_DATA_IN_L1 = "CACHE_DATA_IN_L1";
-  private static final Bytes CACHE_DATA_IN_L1_BYTES = new Bytes(Bytes.toBytes(CACHE_DATA_IN_L1));
 
   /**
    * Key for the PREFETCH_BLOCKS_ON_OPEN attribute. If set, all INDEX, BLOOM,
@@ -228,13 +220,6 @@ public class ColumnFamilyDescriptorBuilder {
    */
   public static final boolean DEFAULT_CACHE_DATA_ON_WRITE = false;
 
-  /**
-   * Default setting for whether to cache data blocks in L1 tier. Only makes
-   * sense if more than one tier in operations: i.e. if we have an L1 and a L2.
-   * This will be the cases if we are using BucketCache.
-   */
-  public static final boolean DEFAULT_CACHE_DATA_IN_L1 = false;
-
   /**
    * Default setting for whether to cache index blocks on write if block caching
    * is enabled.
@@ -310,7 +295,6 @@ public class ColumnFamilyDescriptorBuilder {
     DEFAULT_VALUES.put(KEEP_DELETED_CELLS, String.valueOf(DEFAULT_KEEP_DELETED));
     DEFAULT_VALUES.put(DATA_BLOCK_ENCODING, String.valueOf(DEFAULT_DATA_BLOCK_ENCODING));
     DEFAULT_VALUES.put(CACHE_DATA_ON_WRITE, String.valueOf(DEFAULT_CACHE_DATA_ON_WRITE));
-    DEFAULT_VALUES.put(CACHE_DATA_IN_L1, String.valueOf(DEFAULT_CACHE_DATA_IN_L1));
     DEFAULT_VALUES.put(CACHE_INDEX_ON_WRITE, String.valueOf(DEFAULT_CACHE_INDEX_ON_WRITE));
     DEFAULT_VALUES.put(CACHE_BLOOMS_ON_WRITE, String.valueOf(DEFAULT_CACHE_BLOOMS_ON_WRITE));
     DEFAULT_VALUES.put(EVICT_BLOCKS_ON_CLOSE, String.valueOf(DEFAULT_EVICT_BLOCKS_ON_CLOSE));
@@ -444,11 +428,6 @@ public class ColumnFamilyDescriptorBuilder {
     return this;
   }
 
-  public ColumnFamilyDescriptorBuilder setCacheDataInL1(boolean value) {
-    desc.setCacheDataInL1(value);
-    return this;
-  }
-
   public ColumnFamilyDescriptorBuilder setCacheDataOnWrite(boolean value) {
     desc.setCacheDataOnWrite(value);
     return this;
@@ -1010,21 +989,6 @@ public class ColumnFamilyDescriptorBuilder {
       return setValue(CACHE_DATA_ON_WRITE_BYTES, Boolean.toString(value));
     }
 
-    @Override
-    public boolean isCacheDataInL1() {
-      return getStringOrDefault(CACHE_DATA_IN_L1_BYTES, Boolean::valueOf, DEFAULT_CACHE_DATA_IN_L1);
-    }
-
-    /**
-     * @param value true if we should cache data blocks in the L1 cache (if
-     * block cache deploy has more than one tier; e.g. we are using
-     * CombinedBlockCache).
-     * @return this (for chained invocation)
-     */
-    public ModifyableColumnFamilyDescriptor setCacheDataInL1(boolean value) {
-      return setValue(CACHE_DATA_IN_L1_BYTES, Boolean.toString(value));
-    }
-
     @Override
     public boolean isCacheIndexesOnWrite() {
       return getStringOrDefault(CACHE_INDEX_ON_WRITE_BYTES, Boolean::valueOf, DEFAULT_CACHE_INDEX_ON_WRITE);

hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java

@@ -226,9 +226,6 @@ public class TableDescriptorBuilder {
                               .setInMemory(true)
                               .setBlocksize(8 * 1024)
                               .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
-                              // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                              // e.g. if using CombinedBlockCache (BucketCache).
-                              .setCacheDataInL1(true)
                               .build())
                             .build();
   private final ModifyableTableDescriptor desc;

hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestColumnFamilyDescriptorBuilder.java

@@ -45,8 +45,7 @@ public class TestColumnFamilyDescriptorBuilder {
       = ColumnFamilyDescriptorBuilder.newBuilder(HConstants.CATALOG_FAMILY)
             .setInMemory(true)
             .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
-            .setBloomFilterType(BloomType.NONE)
+            .setBloomFilterType(BloomType.NONE);
-            .setCacheDataInL1(true);
     final int v = 123;
     builder.setBlocksize(v);
     builder.setTimeToLive(v);

hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestImmutableHColumnDescriptor.java

@@ -51,7 +51,6 @@ public class TestImmutableHColumnDescriptor {
     hcd -> hcd.setBlocksize(10),
     hcd -> hcd.setBloomFilterType(BloomType.NONE),
     hcd -> hcd.setCacheBloomsOnWrite(false),
-    hcd -> hcd.setCacheDataInL1(true),
     hcd -> hcd.setCacheDataOnWrite(true),
     hcd -> hcd.setCacheIndexesOnWrite(true),
     hcd -> hcd.setCompactionCompressionType(Compression.Algorithm.LZO),

hbase-common/src/main/resources/hbase-default.xml

@@ -900,13 +900,6 @@ possible configurations would overwhelm and obscure the important.
     See http://hbase.apache.org/book.html#offheap.blockcache for more information.
     </description>
   </property>
-  <property>
-    <name>hbase.bucketcache.combinedcache.enabled</name>
-    <value>true</value>
-    <description>Whether or not the bucketcache is used in league with the LRU
-    on-heap block cache. In this mode, indices and blooms are kept in the LRU
-    blockcache and the data blocks are kept in the bucketcache.</description>
-  </property>
   <property>
     <name>hbase.bucketcache.size</name>
     <value></value>

hbase-external-blockcache/src/main/java/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.java

@@ -110,10 +110,7 @@ public class MemcachedBlockCache implements BlockCache {
   }
 
   @Override
-  public void cacheBlock(BlockCacheKey cacheKey,
+  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) {
-                         Cacheable buf,
-                         boolean inMemory,
-                         boolean cacheDataInL1) {
     cacheBlock(cacheKey, buf);
   }
 
@@ -288,10 +285,4 @@ public class MemcachedBlockCache implements BlockCache {
       return MAX_SIZE;
     }
   }
-
-  @Override
-  public void returnBlock(BlockCacheKey cacheKey, Cacheable block) {
-    // Not doing reference counting. All blocks here are EXCLUSIVE
-  }
-
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCache.java

@@ -34,11 +34,8 @@ public interface BlockCache extends Iterable<CachedBlock> {
    * @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
-   * @param cacheDataInL1 If multi-tier block cache deploy -- i.e. has an L1 and L2 tier -- then
-   * if this flag is true, cache data blocks up in the L1 tier (meta blocks are probably being
-   * cached in L1 already).
    */
-  void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory, boolean cacheDataInL1);
+  void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory);
 
   /**
    * Add block to cache (defaults to not in-memory).
@@ -146,5 +143,5 @@ public interface BlockCache extends Iterable<CachedBlock> {
    * @param cacheKey the cache key of the block
    * @param block the hfileblock to be returned
    */
-  void returnBlock(BlockCacheKey cacheKey, Cacheable block);
+  default void returnBlock(BlockCacheKey cacheKey, Cacheable block){};
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CacheConfig.java

@@ -28,7 +28,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
-import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
 import org.apache.hadoop.hbase.io.hfile.BlockType.BlockCategory;
 import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
 import org.apache.hadoop.hbase.io.util.MemorySizeUtil;
@@ -109,14 +108,6 @@ public class CacheConfig {
   public static final String BUCKET_CACHE_PERSISTENT_PATH_KEY =
       "hbase.bucketcache.persistent.path";
 
-  /**
-   * If the bucket cache is used in league with the lru on-heap block cache (meta blocks such
-   * as indices and blooms are kept in the lru blockcache and the data blocks in the
-   * bucket cache).
-   */
-  public static final String BUCKET_CACHE_COMBINED_KEY =
-      "hbase.bucketcache.combinedcache.enabled";
-
   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";
@@ -129,7 +120,6 @@ public class CacheConfig {
   /**
    * Defaults for Bucket cache
    */
-  public static final boolean DEFAULT_BUCKET_CACHE_COMBINED = true;
   public static final int DEFAULT_BUCKET_CACHE_WRITER_THREADS = 3;
   public static final int DEFAULT_BUCKET_CACHE_WRITER_QUEUE = 64;
 
@@ -218,13 +208,6 @@ public class CacheConfig {
   /** Whether data blocks should be prefetched into the cache */
   private final boolean prefetchOnOpen;
 
-  /**
-   * If true and if more than one tier in this cache deploy -- e.g. CombinedBlockCache has an L1
-   * and an L2 tier -- then cache data blocks up in the L1 tier (The meta blocks are likely being
-   * cached up in L1 already.  At least this is the case if CombinedBlockCache).
-   */
-  private boolean cacheDataInL1;
-
   private final boolean dropBehindCompaction;
 
   /**
@@ -251,8 +234,6 @@ public class CacheConfig {
         conf.getBoolean(CACHE_DATA_BLOCKS_COMPRESSED_KEY, DEFAULT_CACHE_DATA_COMPRESSED),
         conf.getBoolean(PREFETCH_BLOCKS_ON_OPEN_KEY,
             DEFAULT_PREFETCH_ON_OPEN) || family.isPrefetchBlocksOnOpen(),
-        conf.getBoolean(ColumnFamilyDescriptorBuilder.CACHE_DATA_IN_L1,
-            ColumnFamilyDescriptorBuilder.DEFAULT_CACHE_DATA_IN_L1) || family.isCacheDataInL1(),
         conf.getBoolean(DROP_BEHIND_CACHE_COMPACTION_KEY, DROP_BEHIND_CACHE_COMPACTION_DEFAULT)
      );
     LOG.info("Created cacheConfig for " + family.getNameAsString() + ": " + this);
@@ -276,8 +257,6 @@ public class CacheConfig {
         conf.getBoolean(EVICT_BLOCKS_ON_CLOSE_KEY, DEFAULT_EVICT_ON_CLOSE),
         conf.getBoolean(CACHE_DATA_BLOCKS_COMPRESSED_KEY, DEFAULT_CACHE_DATA_COMPRESSED),
         conf.getBoolean(PREFETCH_BLOCKS_ON_OPEN_KEY, DEFAULT_PREFETCH_ON_OPEN),
-        conf.getBoolean(ColumnFamilyDescriptorBuilder.CACHE_DATA_IN_L1,
-          ColumnFamilyDescriptorBuilder.DEFAULT_CACHE_DATA_IN_L1),
         conf.getBoolean(DROP_BEHIND_CACHE_COMPACTION_KEY, DROP_BEHIND_CACHE_COMPACTION_DEFAULT)
      );
     LOG.info("Created cacheConfig: " + this);
@@ -305,7 +284,7 @@ public class CacheConfig {
       final boolean cacheDataOnWrite, final boolean cacheIndexesOnWrite,
       final boolean cacheBloomsOnWrite, final boolean evictOnClose,
       final boolean cacheDataCompressed, final boolean prefetchOnOpen,
-      final boolean cacheDataInL1, final boolean dropBehindCompaction) {
+      final boolean dropBehindCompaction) {
     this.blockCache = blockCache;
     this.cacheDataOnRead = cacheDataOnRead;
     this.inMemory = inMemory;
@@ -315,7 +294,6 @@ public class CacheConfig {
     this.evictOnClose = evictOnClose;
     this.cacheDataCompressed = cacheDataCompressed;
     this.prefetchOnOpen = prefetchOnOpen;
-    this.cacheDataInL1 = cacheDataInL1;
     this.dropBehindCompaction = dropBehindCompaction;
   }
 
@@ -328,12 +306,11 @@ public class CacheConfig {
         cacheConf.cacheDataOnWrite, cacheConf.cacheIndexesOnWrite,
         cacheConf.cacheBloomsOnWrite, cacheConf.evictOnClose,
         cacheConf.cacheDataCompressed, cacheConf.prefetchOnOpen,
-        cacheConf.cacheDataInL1, cacheConf.dropBehindCompaction);
+        cacheConf.dropBehindCompaction);
   }
 
   private CacheConfig() {
-    this(null, false, false, false, false, false,
+    this(null, false, false, false, false, false, false, false, false, false);
-               false, false, false, false, false);
   }
 
   /**
@@ -386,13 +363,6 @@ public class CacheConfig {
     return isBlockCacheEnabled() && this.inMemory;
   }
 
-  /**
-   * @return True if cache data blocks in L1 tier (if more than one tier in block cache deploy).
-   */
-  public boolean isCacheDataInL1() {
-    return isBlockCacheEnabled() && this.cacheDataInL1;
-  }
-
   /**
    * @return true if data blocks should be written to the cache when an HFile is
    *         written, false if not
@@ -411,16 +381,6 @@ public class CacheConfig {
     this.cacheDataOnWrite = cacheDataOnWrite;
   }
 
-  /**
-   * Only used for testing.
-   * @param cacheDataInL1 Whether to cache data blocks up in l1 (if a multi-tier cache
-   * implementation).
-   */
-  @VisibleForTesting
-  public void setCacheDataInL1(boolean cacheDataInL1) {
-    this.cacheDataInL1 = cacheDataInL1;
-  }
-
   /**
    * @return true if index blocks should be written to the cache when an HFile
    *         is written, false if not
@@ -547,8 +507,8 @@ public class CacheConfig {
   // Clear this if in tests you'd make more than one block cache instance.
   @VisibleForTesting
   static BlockCache GLOBAL_BLOCK_CACHE_INSTANCE;
-  private static LruBlockCache GLOBAL_L1_CACHE_INSTANCE = null;
+  private static LruBlockCache ONHEAP_CACHE_INSTANCE = null;
-  private static BlockCache GLOBAL_L2_CACHE_INSTANCE = null;
+  private static BlockCache L2_CACHE_INSTANCE = null;// Can be BucketCache or External cache.
 
   /** Boolean whether we have disabled the block cache entirely. */
   @VisibleForTesting
@@ -558,20 +518,20 @@ public class CacheConfig {
    * @param c Configuration to use.
    * @return An L1 instance.  Currently an instance of LruBlockCache.
    */
-  public static LruBlockCache getL1(final Configuration c) {
+  public static LruBlockCache getOnHeapCache(final Configuration c) {
-    return getL1Internal(c);
+    return getOnHeapCacheInternal(c);
   }
 
-  public CacheStats getL1Stats() {
+  public CacheStats getOnHeapCacheStats() {
-    if (GLOBAL_L1_CACHE_INSTANCE != null) {
+    if (ONHEAP_CACHE_INSTANCE != null) {
-      return GLOBAL_L1_CACHE_INSTANCE.getStats();
+      return ONHEAP_CACHE_INSTANCE.getStats();
     }
     return null;
   }
 
-  public CacheStats getL2Stats() {
+  public CacheStats getL2CacheStats() {
-    if (GLOBAL_L2_CACHE_INSTANCE != null) {
+    if (L2_CACHE_INSTANCE != null) {
-      return GLOBAL_L2_CACHE_INSTANCE.getStats();
+      return L2_CACHE_INSTANCE.getStats();
     }
     return null;
   }
@@ -580,43 +540,26 @@ public class CacheConfig {
    * @param c Configuration to use.
    * @return An L1 instance.  Currently an instance of LruBlockCache.
    */
-  private synchronized static LruBlockCache getL1Internal(final Configuration c) {
+  private synchronized static LruBlockCache getOnHeapCacheInternal(final Configuration c) {
-    if (GLOBAL_L1_CACHE_INSTANCE != null) return GLOBAL_L1_CACHE_INSTANCE;
+    if (ONHEAP_CACHE_INSTANCE != null) {
-    final long lruCacheSize = MemorySizeUtil.getLruCacheSize(c);
+      return ONHEAP_CACHE_INSTANCE;
-    if (lruCacheSize < 0) {
+    }
+    final long cacheSize = MemorySizeUtil.getOnHeapCacheSize(c);
+    if (cacheSize < 0) {
       blockCacheDisabled = true;
     }
     if (blockCacheDisabled) return null;
     int blockSize = c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);
-    LOG.info("Allocating LruBlockCache size=" +
+    LOG.info("Allocating On heap LruBlockCache size=" +
-      StringUtils.byteDesc(lruCacheSize) + ", blockSize=" + StringUtils.byteDesc(blockSize));
+      StringUtils.byteDesc(cacheSize) + ", blockSize=" + StringUtils.byteDesc(blockSize));
-    GLOBAL_L1_CACHE_INSTANCE = new LruBlockCache(lruCacheSize, blockSize, true, c);
+    ONHEAP_CACHE_INSTANCE = new LruBlockCache(cacheSize, blockSize, true, c);
-    return GLOBAL_L1_CACHE_INSTANCE;
+    return ONHEAP_CACHE_INSTANCE;
-  }
-
-  /**
-   * @param c Configuration to use.
-   * @return Returns L2 block cache instance (for now it is BucketCache BlockCache all the time)
-   * or null if not supposed to be a L2.
-   */
-  @VisibleForTesting
-  static BlockCache getL2(final Configuration c) {
-    final boolean useExternal = c.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
-    if (LOG.isDebugEnabled()) {
-      LOG.debug("Trying to use " + (useExternal?" External":" Internal") + " l2 cache");
-    }
-
-    // If we want to use an external block cache then create that.
-    if (useExternal) {
-      GLOBAL_L2_CACHE_INSTANCE = getExternalBlockcache(c);
-    } else {
-      // otherwise use the bucket cache.
-      GLOBAL_L2_CACHE_INSTANCE = getBucketCache(c);
-    }
-    return GLOBAL_L2_CACHE_INSTANCE;
   }
 
   private static BlockCache getExternalBlockcache(Configuration c) {
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Trying to use External l2 cache");
+    }
     Class klass = null;
 
     // Get the class, from the config. s
@@ -642,7 +585,8 @@ public class CacheConfig {
 
   }
 
-  private static BlockCache getBucketCache(Configuration c) {
+  @VisibleForTesting
+  static BucketCache getBucketCache(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;
@@ -705,30 +649,25 @@ public class CacheConfig {
   public static synchronized BlockCache instantiateBlockCache(Configuration conf) {
     if (GLOBAL_BLOCK_CACHE_INSTANCE != null) return GLOBAL_BLOCK_CACHE_INSTANCE;
     if (blockCacheDisabled) return null;
-    LruBlockCache l1 = getL1Internal(conf);
+    LruBlockCache onHeapCache = getOnHeapCacheInternal(conf);
-    // blockCacheDisabled is set as a side-effect of getL1Internal(), so check it again after the call.
+    // blockCacheDisabled is set as a side-effect of getL1Internal(), so check it again after the
+    // call.
     if (blockCacheDisabled) return null;
-    BlockCache l2 = getL2(conf);
-    if (l2 == null) {
-      GLOBAL_BLOCK_CACHE_INSTANCE = l1;
-    } else {
     boolean useExternal = conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);
-      boolean combinedWithLru = conf.getBoolean(BUCKET_CACHE_COMBINED_KEY,
-        DEFAULT_BUCKET_CACHE_COMBINED);
     if (useExternal) {
-        GLOBAL_BLOCK_CACHE_INSTANCE = new InclusiveCombinedBlockCache(l1, l2);
+      L2_CACHE_INSTANCE = getExternalBlockcache(conf);
+      GLOBAL_BLOCK_CACHE_INSTANCE = L2_CACHE_INSTANCE == null ? onHeapCache
+          : new InclusiveCombinedBlockCache(onHeapCache, L2_CACHE_INSTANCE);
     } else {
-        if (combinedWithLru) {
+      // otherwise use the bucket cache.
-          GLOBAL_BLOCK_CACHE_INSTANCE = new CombinedBlockCache(l1, l2);
+      L2_CACHE_INSTANCE = getBucketCache(conf);
-        } else {
+      if (!conf.getBoolean("hbase.bucketcache.combinedcache.enabled", true)) {
-          // L1 and L2 are not 'combined'.  They are connected via the LruBlockCache victimhandler
+        // Non combined mode is off from 2.0
-          // mechanism.  It is a little ugly but works according to the following: when the
+        LOG.warn(
-          // background eviction thread runs, blocks evicted from L1 will go to L2 AND when we get
+            "From HBase 2.0 onwards only combined mode of LRU cache and bucket cache is available");
-          // a block from the L1 cache, if not in L1, we will search L2.
-          GLOBAL_BLOCK_CACHE_INSTANCE = l1;
       }
-      }
+      GLOBAL_BLOCK_CACHE_INSTANCE = L2_CACHE_INSTANCE == null ? onHeapCache
-      l1.setVictimCache(l2);
+          : new CombinedBlockCache(onHeapCache, L2_CACHE_INSTANCE);
     }
     return GLOBAL_BLOCK_CACHE_INSTANCE;
   }
@@ -736,8 +675,8 @@ public class CacheConfig {
   // Supposed to use only from tests. Some tests want to reinit the Global block cache instance
   @VisibleForTesting
   static synchronized void clearGlobalInstances() {
-    GLOBAL_L1_CACHE_INSTANCE = null;
+    ONHEAP_CACHE_INSTANCE = null;
-    GLOBAL_L2_CACHE_INSTANCE = null;
+    L2_CACHE_INSTANCE = null;
     GLOBAL_BLOCK_CACHE_INSTANCE = null;
   }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CombinedBlockCache.java

@@ -31,23 +31,21 @@ import org.apache.hadoop.hbase.shaded.com.google.common.annotations.VisibleForTe
 /**
  * CombinedBlockCache is an abstraction layer that combines
  * {@link LruBlockCache} and {@link BucketCache}. The smaller lruCache is used
- * to cache bloom blocks and index blocks.  The larger l2Cache is used to
+ * to cache bloom blocks and index blocks.  The larger Cache is used to
  * cache data blocks. {@link #getBlock(BlockCacheKey, boolean, boolean, boolean)} reads
- * first from the smaller lruCache before looking for the block in the l2Cache.  Blocks evicted
+ * first from the smaller lruCache before looking for the block in the l2Cache.
- * from lruCache are put into the bucket cache. 
  * Metrics are the combined size and hits and misses of both caches.
- * 
  */
 @InterfaceAudience.Private
 public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
-  protected final LruBlockCache lruCache;
+  protected final LruBlockCache onHeapCache;
   protected final BlockCache l2Cache;
   protected final CombinedCacheStats combinedCacheStats;
 
-  public CombinedBlockCache(LruBlockCache lruCache, BlockCache l2Cache) {
+  public CombinedBlockCache(LruBlockCache onHeapCache, BlockCache l2Cache) {
-    this.lruCache = lruCache;
+    this.onHeapCache = onHeapCache;
     this.l2Cache = l2Cache;
-    this.combinedCacheStats = new CombinedCacheStats(lruCache.getStats(),
+    this.combinedCacheStats = new CombinedCacheStats(onHeapCache.getStats(),
         l2Cache.getStats());
   }
 
@@ -57,23 +55,22 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
     if (l2Cache instanceof HeapSize) {
       l2size = ((HeapSize) l2Cache).heapSize();
     }
-    return lruCache.heapSize() + l2size;
+    return onHeapCache.heapSize() + l2size;
   }
 
   @Override
-  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
+  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) {
-      final boolean cacheDataInL1) {
     boolean metaBlock = buf.getBlockType().getCategory() != BlockCategory.DATA;
-    if (metaBlock || cacheDataInL1) {
+    if (metaBlock) {
-      lruCache.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
+      onHeapCache.cacheBlock(cacheKey, buf, inMemory);
     } else {
-      l2Cache.cacheBlock(cacheKey, buf, inMemory, false);
+      l2Cache.cacheBlock(cacheKey, buf, inMemory);
     }
   }
 
   @Override
   public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {
-    cacheBlock(cacheKey, buf, false, false);
+    cacheBlock(cacheKey, buf, false);
   }
 
   @Override
@@ -81,19 +78,21 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
       boolean repeat, boolean updateCacheMetrics) {
     // TODO: is there a hole here, or just awkwardness since in the lruCache getBlock
     // we end up calling l2Cache.getBlock.
-    return lruCache.containsBlock(cacheKey)?
+    // We are not in a position to exactly look at LRU cache or BC as BlockType may not be getting
-        lruCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics):
+    // passed always.
+    return onHeapCache.containsBlock(cacheKey)?
+        onHeapCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics):
         l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
   }
 
   @Override
   public boolean evictBlock(BlockCacheKey cacheKey) {
-    return lruCache.evictBlock(cacheKey) || l2Cache.evictBlock(cacheKey);
+    return onHeapCache.evictBlock(cacheKey) || l2Cache.evictBlock(cacheKey);
   }
 
   @Override
   public int evictBlocksByHfileName(String hfileName) {
-    return lruCache.evictBlocksByHfileName(hfileName)
+    return onHeapCache.evictBlocksByHfileName(hfileName)
         + l2Cache.evictBlocksByHfileName(hfileName);
   }
 
@@ -104,43 +103,43 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
 
   @Override
   public void shutdown() {
-    lruCache.shutdown();
+    onHeapCache.shutdown();
     l2Cache.shutdown();
   }
 
   @Override
   public long size() {
-    return lruCache.size() + l2Cache.size();
+    return onHeapCache.size() + l2Cache.size();
   }
 
   @Override
   public long getMaxSize() {
-    return lruCache.getMaxSize() + l2Cache.getMaxSize();
+    return onHeapCache.getMaxSize() + l2Cache.getMaxSize();
   }
 
   @Override
   public long getCurrentDataSize() {
-    return lruCache.getCurrentDataSize() + l2Cache.getCurrentDataSize();
+    return onHeapCache.getCurrentDataSize() + l2Cache.getCurrentDataSize();
   }
 
   @Override
   public long getFreeSize() {
-    return lruCache.getFreeSize() + l2Cache.getFreeSize();
+    return onHeapCache.getFreeSize() + l2Cache.getFreeSize();
   }
 
   @Override
   public long getCurrentSize() {
-    return lruCache.getCurrentSize() + l2Cache.getCurrentSize();
+    return onHeapCache.getCurrentSize() + l2Cache.getCurrentSize();
   }
 
   @Override
   public long getBlockCount() {
-    return lruCache.getBlockCount() + l2Cache.getBlockCount();
+    return onHeapCache.getBlockCount() + l2Cache.getBlockCount();
   }
 
   @Override
   public long getDataBlockCount() {
-    return lruCache.getDataBlockCount() + l2Cache.getDataBlockCount();
+    return onHeapCache.getDataBlockCount() + l2Cache.getDataBlockCount();
   }
 
   public static class CombinedCacheStats extends CacheStats {
@@ -363,12 +362,12 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
 
   @Override
   public BlockCache[] getBlockCaches() {
-    return new BlockCache [] {this.lruCache, this.l2Cache};
+    return new BlockCache [] {this.onHeapCache, this.l2Cache};
   }
 
   @Override
   public void setMaxSize(long size) {
-    this.lruCache.setMaxSize(size);
+    this.onHeapCache.setMaxSize(size);
   }
 
   @Override
@@ -379,6 +378,7 @@ public class CombinedBlockCache implements ResizableBlockCache, HeapSize {
 
   @VisibleForTesting
   public int getRefCount(BlockCacheKey cacheKey) {
-    return ((BucketCache) this.l2Cache).getRefCount(cacheKey);
+    return (this.l2Cache instanceof BucketCache)
+        ? ((BucketCache) this.l2Cache).getRefCount(cacheKey) : 0;
   }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.java

@@ -1408,8 +1408,7 @@ public class HFileReaderImpl implements HFile.Reader, Configurable {
 
       // Cache the block
       if (cacheBlock) {
-        cacheConf.getBlockCache().cacheBlock(cacheKey, metaBlock,
+        cacheConf.getBlockCache().cacheBlock(cacheKey, metaBlock, cacheConf.isInMemory());
-            cacheConf.isInMemory(), this.cacheConf.isCacheDataInL1());
       }
 
       return metaBlock;
@@ -1495,7 +1494,7 @@ public class HFileReaderImpl implements HFile.Reader, Configurable {
         if (cacheBlock && cacheConf.shouldCacheBlockOnRead(category)) {
           cacheConf.getBlockCache().cacheBlock(cacheKey,
             cacheConf.shouldCacheCompressed(category) ? hfileBlock : unpacked,
-            cacheConf.isInMemory(), this.cacheConf.isCacheDataInL1());
+            cacheConf.isInMemory());
         }
 
         if (updateCacheMetrics && hfileBlock.getBlockType().isData()) {

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/InclusiveCombinedBlockCache.java

@@ -19,13 +19,13 @@
 
 package org.apache.hadoop.hbase.io.hfile;
 
-import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.yetus.audience.InterfaceAudience;
 
-@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
+@InterfaceAudience.Private
-public class InclusiveCombinedBlockCache extends CombinedBlockCache implements BlockCache {
+public class InclusiveCombinedBlockCache extends CombinedBlockCache {
   public InclusiveCombinedBlockCache(LruBlockCache l1, BlockCache l2) {
     super(l1,l2);
+    l1.setVictimCache(l2);
   }
 
   @Override
@@ -34,7 +34,7 @@ public class InclusiveCombinedBlockCache extends CombinedBlockCache implements B
     // 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);
+    return onHeapCache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
   }
 
   /**
@@ -43,16 +43,21 @@ public class InclusiveCombinedBlockCache extends CombinedBlockCache implements B
    * @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,
+  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);
+    onHeapCache.cacheBlock(cacheKey, buf, inMemory);
 
     // This assumes that insertion into the L2 block cache is either async or very fast.
-    l2Cache.cacheBlock(cacheKey, buf, inMemory, true);
+    l2Cache.cacheBlock(cacheKey, buf, inMemory);
+  }
+
+  @Override
+  public boolean evictBlock(BlockCacheKey cacheKey) {
+    boolean l1Result = this.onHeapCache.evictBlock(cacheKey);
+    boolean l2Result = this.l2Cache.evictBlock(cacheKey);
+    return l1Result || l2Result;
   }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java

@@ -40,7 +40,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.hbase.io.HeapSize;
 import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
-import org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.ClassSize;
 import org.apache.hadoop.hbase.util.HasThread;
@@ -223,7 +222,11 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
   /** Whether in-memory hfile's data block has higher priority when evicting */
   private boolean forceInMemory;
 
-  /** Where to send victims (blocks evicted/missing from the cache) */
+  /**
+   * Where to send victims (blocks evicted/missing from the cache). This is used only when we use an
+   * external cache as L2.
+   * Note: See org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache
+   */
   private BlockCache victimHandler = null;
 
   /**
@@ -360,9 +363,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
    * @param inMemory if block is in-memory
    */
   @Override
-  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
+  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) {
-      final boolean cacheDataInL1) {
-
     if (buf.heapSize() > maxBlockSize) {
       // If there are a lot of blocks that are too
       // big this can make the logs way too noisy.
@@ -448,7 +449,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
    * @param buf      block buffer
    */
   public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {
-    cacheBlock(cacheKey, buf, false, false);
+    cacheBlock(cacheKey, buf, false);
   }
 
   /**
@@ -499,7 +500,7 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
           if (result instanceof HFileBlock && ((HFileBlock) result).usesSharedMemory()) {
             result = ((HFileBlock) result).deepClone();
           }
-          cacheBlock(cacheKey, result, /* inMemory = */ false, /* cacheData = */ true);
+          cacheBlock(cacheKey, result, /* inMemory = */ false);
         }
         return result;
       }
@@ -577,16 +578,9 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
       // update the stats counter.
       stats.evicted(block.getCachedTime(), block.getCacheKey().isPrimary());
       if (victimHandler != null) {
-        if (victimHandler instanceof BucketCache) {
-          boolean wait = getCurrentSize() < acceptableSize();
-          boolean inMemory = block.getPriority() == BlockPriority.MEMORY;
-          ((BucketCache) victimHandler).cacheBlockWithWait(block.getCacheKey(), block.getBuffer(),
-              inMemory, true, wait);
-        } else {
         victimHandler.cacheBlock(block.getCacheKey(), block.getBuffer());
       }
     }
-    }
     return block.heapSize();
   }
 
@@ -1179,10 +1173,6 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
     return map;
   }
 
-  BlockCache getVictimHandler() {
-    return this.victimHandler;
-  }
-
   @Override
   @JsonIgnore
   public BlockCache[] getBlockCaches() {
@@ -1190,16 +1180,4 @@ public class LruBlockCache implements ResizableBlockCache, HeapSize {
       return new BlockCache[] {this, this.victimHandler};
     return null;
   }
-
-  @Override
-  public void returnBlock(BlockCacheKey cacheKey, Cacheable block) {
-    // There is no SHARED type here in L1. But the block might have been served from the Victim
-    // handler L2 cache. (when the Combined mode = false). So just try return this block to
-    // L2 victim handler cache.
-    // Note : In case of CombinedBlockCache, we will have this victimHandler configured for L1
-    // cache. But CombinedBlockCache will only call returnBlock on L2 cache.
-    if (this.victimHandler != null) {
-      this.victimHandler.returnBlock(cacheKey, block);
-    }
-  }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java

@@ -397,7 +397,7 @@ public class BucketCache implements BlockCache, HeapSize {
    */
   @Override
   public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {
-    cacheBlock(cacheKey, buf, false, false);
+    cacheBlock(cacheKey, buf, false);
   }
 
   /**
@@ -405,12 +405,10 @@ public class BucketCache implements BlockCache, HeapSize {
    * @param cacheKey block's cache key
    * @param cachedItem block buffer
    * @param inMemory if block is in-memory
-   * @param cacheDataInL1
    */
   @Override
-  public void cacheBlock(BlockCacheKey cacheKey, Cacheable cachedItem, boolean inMemory,
+  public void cacheBlock(BlockCacheKey cacheKey, Cacheable cachedItem, boolean inMemory) {
-      final boolean cacheDataInL1) {
+    cacheBlockWithWait(cacheKey, cachedItem, inMemory, wait_when_cache);
-    cacheBlockWithWait(cacheKey, cachedItem, inMemory, cacheDataInL1, wait_when_cache);
   }
 
   /**
@@ -421,23 +419,18 @@ public class BucketCache implements BlockCache, HeapSize {
    * @param wait if true, blocking wait when queue is full
    */
   public void cacheBlockWithWait(BlockCacheKey cacheKey, Cacheable cachedItem, boolean inMemory,
-      boolean cacheDataInL1, boolean wait) {
+      boolean wait) {
     if (LOG.isTraceEnabled()) LOG.trace("Caching key=" + cacheKey + ", item=" + cachedItem);
     if (!cacheEnabled) {
       return;
     }
 
     if (backingMap.containsKey(cacheKey)) {
-      /*
-       * Compare already cached block only if lruBlockCache is not used to cache data blocks
-       */
-       if (!cacheDataInL1) {
       Cacheable existingBlock = getBlock(cacheKey, false, false, false);
       if (BlockCacheUtil.compareCacheBlock(cachedItem, existingBlock) != 0) {
         throw new RuntimeException("Cached block contents differ, which should not have happened."
             + "cacheKey:" + cacheKey);
       }
-       }
        String msg = "Caching an already cached block: " + cacheKey;
        msg += ". This is harmless and can happen in rare cases (see HBASE-8547)";
        LOG.warn(msg);

hbase-server/src/main/java/org/apache/hadoop/hbase/io/util/MemorySizeUtil.java

@@ -213,7 +213,7 @@ public class MemorySizeUtil {
    * @return the number of bytes to use for LRU, negative if disabled.
    * @throws IllegalArgumentException if HFILE_BLOCK_CACHE_SIZE_KEY is > 1.0
    */
-  public static long getLruCacheSize(final Configuration conf) {
+  public static long getOnHeapCacheSize(final Configuration conf) {
     float cachePercentage = conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
       HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
     if (cachePercentage <= 0.0001f) {

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HeapMemoryManager.java

@@ -107,9 +107,9 @@ public class HeapMemoryManager {
 
   public static HeapMemoryManager create(Configuration conf, FlushRequester memStoreFlusher,
       Server server, RegionServerAccounting regionServerAccounting) {
-    ResizableBlockCache l1Cache = CacheConfig.getL1(conf);
+    ResizableBlockCache lruCache = CacheConfig.getOnHeapCache(conf);
-    if (l1Cache != null) {
+    if (lruCache != null) {
-      return new HeapMemoryManager(l1Cache, memStoreFlusher, server, regionServerAccounting);
+      return new HeapMemoryManager(lruCache, memStoreFlusher, server, regionServerAccounting);
     }
     return null;
   }

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MetricsRegionServerWrapperImpl.java

@@ -153,8 +153,8 @@ class MetricsRegionServerWrapperImpl
   private synchronized  void initBlockCache() {
     CacheConfig cacheConfig = this.regionServer.cacheConfig;
     if (cacheConfig != null) {
-      l1Stats = cacheConfig.getL1Stats();
+      l1Stats = cacheConfig.getOnHeapCacheStats();
-      l2Stats = cacheConfig.getL2Stats();
+      l2Stats = cacheConfig.getL2CacheStats();
       if (this.blockCache == null) {
         this.blockCache = cacheConfig.getBlockCache();
       }

hbase-server/src/main/java/org/apache/hadoop/hbase/security/access/AccessController.java

@@ -1326,10 +1326,7 @@ public class AccessController implements MasterCoprocessor, RegionCoprocessor,
         setBlockCacheEnabled(true).
         setBlocksize(8 * 1024).
         setBloomFilterType(BloomType.NONE).
-        setScope(HConstants.REPLICATION_SCOPE_LOCAL).
+        setScope(HConstants.REPLICATION_SCOPE_LOCAL).build();
-        // Set cache data blocks in L1 if more than one cache tier deployed; e.g. this will
-        // be the case if we are using CombinedBlockCache (Bucket Cache).
-        setCacheDataInL1(true).build();
     TableDescriptor td =
         TableDescriptorBuilder.newBuilder(AccessControlLists.ACL_TABLE_NAME).
         addColumnFamily(cfd).build();

hbase-server/src/main/java/org/apache/hadoop/hbase/util/FSTableDescriptors.java

@@ -155,9 +155,6 @@ public class FSTableDescriptors implements TableDescriptors {
                     .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
                     // Disable blooms for meta.  Needs work.  Seems to mess w/ getClosestOrBefore.
                     .setBloomFilterType(BloomType.NONE)
-                    // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                    // e.g. if using CombinedBlockCache (BucketCache).
-                    .setCacheDataInL1(true)
                     .build())
             .addColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.REPLICATION_BARRIER_FAMILY)
                     .setMaxVersions(conf.getInt(HConstants.HBASE_META_VERSIONS,
@@ -168,9 +165,6 @@ public class FSTableDescriptors implements TableDescriptors {
                     .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
                     // Disable blooms for meta.  Needs work.  Seems to mess w/ getClosestOrBefore.
                     .setBloomFilterType(BloomType.NONE)
-                    // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                    // e.g. if using CombinedBlockCache (BucketCache).
-                    .setCacheDataInL1(true)
                     .build())
             .addColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.REPLICATION_POSITION_FAMILY)
                     .setMaxVersions(conf.getInt(HConstants.HBASE_META_VERSIONS,
@@ -181,9 +175,6 @@ public class FSTableDescriptors implements TableDescriptors {
                     .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
                     // Disable blooms for meta.  Needs work.  Seems to mess w/ getClosestOrBefore.
                     .setBloomFilterType(BloomType.NONE)
-                    // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                    // e.g. if using CombinedBlockCache (BucketCache).
-                    .setCacheDataInL1(true)
                     .build())
             .addColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.REPLICATION_META_FAMILY)
                     .setMaxVersions(conf.getInt(HConstants.HBASE_META_VERSIONS,
@@ -194,9 +185,6 @@ public class FSTableDescriptors implements TableDescriptors {
                     .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
                     // Disable blooms for meta.  Needs work.  Seems to mess w/ getClosestOrBefore.
                     .setBloomFilterType(BloomType.NONE)
-                    // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                    // e.g. if using CombinedBlockCache (BucketCache).
-                    .setCacheDataInL1(true)
                     .build())
             .addColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(HConstants.TABLE_FAMILY)
                     // Ten is arbitrary number.  Keep versions to help debugging.
@@ -206,9 +194,6 @@ public class FSTableDescriptors implements TableDescriptors {
                     .setScope(HConstants.REPLICATION_SCOPE_LOCAL)
                     // Disable blooms for meta.  Needs work.  Seems to mess w/ getClosestOrBefore.
                     .setBloomFilterType(BloomType.NONE)
-                    // Enable cache of data blocks in L1 if more than one caching tier deployed:
-                    // e.g. if using CombinedBlockCache (BucketCache).
-                    .setCacheDataInL1(true)
                     .build())
             .addCoprocessor("org.apache.hadoop.hbase.coprocessor.MultiRowMutationEndpoint",
                     null, Coprocessor.PRIORITY_SYSTEM, null);

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheConfig.java

@@ -27,7 +27,6 @@ import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.lang.management.MemoryUsage;
 import java.nio.ByteBuffer;
-import java.util.Map;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -186,7 +185,7 @@ public class TestCacheConfig {
     Cacheable c = new DataCacheEntry();
     // Do asserts on block counting.
     long initialBlockCount = bc.getBlockCount();
-    bc.cacheBlock(bck, c, cc.isInMemory(), cc.isCacheDataInL1());
+    bc.cacheBlock(bck, c, cc.isInMemory());
     assertEquals(doubling? 2: 1, bc.getBlockCount() - initialBlockCount);
     bc.evictBlock(bck);
     assertEquals(initialBlockCount, bc.getBlockCount());
@@ -194,7 +193,7 @@ public class TestCacheConfig {
     // buffers do lazy allocation so sizes are off on first go around.
     if (sizing) {
       long originalSize = bc.getCurrentSize();
-      bc.cacheBlock(bck, c, cc.isInMemory(), cc.isCacheDataInL1());
+      bc.cacheBlock(bck, c, cc.isInMemory());
       assertTrue(bc.getCurrentSize() > originalSize);
       bc.evictBlock(bck);
       long size = bc.getCurrentSize();
@@ -202,19 +201,6 @@ public class TestCacheConfig {
     }
   }
 
-  /**
-   * @param cc
-   * @param filename
-   * @return
-   */
-  private long cacheDataBlock(final CacheConfig cc, final String filename) {
-    BlockCacheKey bck = new BlockCacheKey(filename, 0);
-    Cacheable c = new DataCacheEntry();
-    // Do asserts on block counting.
-    cc.getBlockCache().cacheBlock(bck, c, cc.isInMemory(), cc.isCacheDataInL1());
-    return cc.getBlockCache().getBlockCount();
-  }
-
   @Test
   public void testDisableCacheDataBlock() throws IOException {
     Configuration conf = HBaseConfiguration.create();
@@ -324,7 +310,7 @@ public class TestCacheConfig {
     BlockCache [] bcs = cbc.getBlockCaches();
     assertTrue(bcs[0] instanceof LruBlockCache);
     LruBlockCache lbc = (LruBlockCache)bcs[0];
-    assertEquals(MemorySizeUtil.getLruCacheSize(this.conf), lbc.getMaxSize());
+    assertEquals(MemorySizeUtil.getOnHeapCacheSize(this.conf), lbc.getMaxSize());
     assertTrue(bcs[1] instanceof BucketCache);
     BucketCache bc = (BucketCache)bcs[1];
     // getMaxSize comes back in bytes but we specified size in MB
@@ -342,19 +328,19 @@ public class TestCacheConfig {
     // from L1 happens, it does not fail because L2 can't take the eviction because block too big.
     this.conf.setFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY, 0.001f);
     MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
-    long lruExpectedSize = MemorySizeUtil.getLruCacheSize(this.conf);
+    long lruExpectedSize = MemorySizeUtil.getOnHeapCacheSize(this.conf);
     final int bcSize = 100;
     long bcExpectedSize = 100 * 1024 * 1024; // MB.
     assertTrue(lruExpectedSize < bcExpectedSize);
     this.conf.setInt(HConstants.BUCKET_CACHE_SIZE_KEY, bcSize);
-    this.conf.setBoolean(CacheConfig.BUCKET_CACHE_COMBINED_KEY, false);
     CacheConfig cc = new CacheConfig(this.conf);
     basicBlockCacheOps(cc, false, false);
-    assertTrue(cc.getBlockCache() instanceof LruBlockCache);
+    assertTrue(cc.getBlockCache() instanceof CombinedBlockCache);
     // TODO: Assert sizes allocated are right and proportions.
-    LruBlockCache lbc = (LruBlockCache)cc.getBlockCache();
+    CombinedBlockCache cbc = (CombinedBlockCache)cc.getBlockCache();
+    LruBlockCache lbc = cbc.onHeapCache;
     assertEquals(lruExpectedSize, lbc.getMaxSize());
-    BlockCache bc = lbc.getVictimHandler();
+    BlockCache bc = cbc.l2Cache;
     // getMaxSize comes back in bytes but we specified size in MB
     assertEquals(bcExpectedSize, ((BucketCache) bc).getMaxSize());
     // Test the L1+L2 deploy works as we'd expect with blocks evicted from L1 going to L2.
@@ -362,7 +348,7 @@ public class TestCacheConfig {
     long initialL2BlockCount = bc.getBlockCount();
     Cacheable c = new DataCacheEntry();
     BlockCacheKey bck = new BlockCacheKey("bck", 0);
-    lbc.cacheBlock(bck, c, false, false);
+    lbc.cacheBlock(bck, c, false);
     assertEquals(initialL1BlockCount + 1, lbc.getBlockCount());
     assertEquals(initialL2BlockCount, bc.getBlockCount());
     // Force evictions by putting in a block too big.
@@ -381,32 +367,6 @@ public class TestCacheConfig {
     // The eviction thread in lrublockcache needs to run.
     while (initialL1BlockCount != lbc.getBlockCount()) Threads.sleep(10);
     assertEquals(initialL1BlockCount, lbc.getBlockCount());
-    long count = bc.getBlockCount();
-    assertTrue(initialL2BlockCount + 1 <= count);
-  }
-
-  /**
-   * Test the cacheDataInL1 flag.  When set, data blocks should be cached in the l1 tier, up in
-   * LruBlockCache when using CombinedBlockCcahe.
-   */
-  @Test
-  public void testCacheDataInL1() {
-    this.conf.set(HConstants.BUCKET_CACHE_IOENGINE_KEY, "offheap");
-    this.conf.setInt(HConstants.BUCKET_CACHE_SIZE_KEY, 100);
-    CacheConfig cc = new CacheConfig(this.conf);
-    assertTrue(cc.getBlockCache() instanceof CombinedBlockCache);
-    CombinedBlockCache cbc = (CombinedBlockCache)cc.getBlockCache();
-    // Add a data block.  Should go into L2, into the Bucket Cache, not the LruBlockCache.
-    cacheDataBlock(cc, "1");
-    LruBlockCache lrubc = (LruBlockCache)cbc.getBlockCaches()[0];
-    assertDataBlockCount(lrubc, 0);
-    // Enable our test flag.
-    cc.setCacheDataInL1(true);
-    cacheDataBlock(cc, "2");
-    assertDataBlockCount(lrubc, 1);
-    cc.setCacheDataInL1(false);
-    cacheDataBlock(cc, "3");
-    assertDataBlockCount(lrubc, 1);
   }
 
   @Test
@@ -416,16 +376,9 @@ public class TestCacheConfig {
     c.set(CacheConfig.BUCKET_CACHE_BUCKETS_KEY, "256,512,1024,2048,4000,4096");
     c.setFloat(HConstants.BUCKET_CACHE_SIZE_KEY, 1024);
     try {
-      CacheConfig.getL2(c);
+      CacheConfig.getBucketCache(c);
       fail("Should throw IllegalArgumentException when passing illegal value for bucket size");
     } catch (IllegalArgumentException e) {
     }
   }
-
-  private void assertDataBlockCount(final LruBlockCache bc, final int expected) {
-    Map<BlockType, Integer> blocks = bc.getBlockTypeCountsForTest();
-    assertEquals(expected, blocks == null? 0:
-      blocks.get(BlockType.DATA) == null? 0:
-      blocks.get(BlockType.DATA).intValue());
-  }
 }

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheOnWrite.java

@@ -230,7 +230,7 @@ public class TestCacheOnWrite {
         new CacheConfig(blockCache, true, true, cowType.shouldBeCached(BlockType.DATA),
         cowType.shouldBeCached(BlockType.LEAF_INDEX),
         cowType.shouldBeCached(BlockType.BLOOM_CHUNK), false, cacheCompressedData,
-            false, false, false);
+            false, false);
   }
 
   @After

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestLruBlockCache.java

@@ -80,7 +80,7 @@ public class TestLruBlockCache {
             for (int blockIndex = 0; blockIndex < blocksPerThread || (!cache.isEvictionInProgress()); ++blockIndex) {
               CachedItem block = new CachedItem(hfileName, (int) blockSize, blockCount.getAndIncrement());
               boolean inMemory = Math.random() > 0.5;
-              cache.cacheBlock(block.cacheKey, block, inMemory, false);
+              cache.cacheBlock(block.cacheKey, block, inMemory);
             }
             cache.evictBlocksByHfileName(hfileName);
           }
@@ -350,7 +350,7 @@ public class TestLruBlockCache {
       cache.getBlock(multiBlocks[i].cacheKey, true, false, true);
 
       // Add memory blocks as such
-      cache.cacheBlock(memoryBlocks[i].cacheKey, memoryBlocks[i], true, false);
+      cache.cacheBlock(memoryBlocks[i].cacheKey, memoryBlocks[i], true);
       expectedCacheSize += memoryBlocks[i].cacheBlockHeapSize();
 
     }
@@ -385,7 +385,7 @@ public class TestLruBlockCache {
     assertEquals(null, cache.getBlock(multiBlocks[0].cacheKey, true, false, true));
 
     // Insert another memory block
-    cache.cacheBlock(memoryBlocks[3].cacheKey, memoryBlocks[3], true, false);
+    cache.cacheBlock(memoryBlocks[3].cacheKey, memoryBlocks[3], true);
 
     // Three evictions, three evicted.
     assertEquals(3, cache.getStats().getEvictionCount());
@@ -423,7 +423,7 @@ public class TestLruBlockCache {
     assertEquals(null, cache.getBlock(multiBlocks[2].cacheKey, true, false, true));
 
     // Cache a big memory block
-    cache.cacheBlock(bigBlocks[2].cacheKey, bigBlocks[2], true, false);
+    cache.cacheBlock(bigBlocks[2].cacheKey, bigBlocks[2], true);
 
     // Six evictions, twelve evicted (3 new)
     assertEquals(6, cache.getStats().getEvictionCount());
@@ -478,7 +478,7 @@ public class TestLruBlockCache {
     assertEquals(expectedCacheSize, cache.heapSize());
 
     // 1. Insert a memory block, oldest single should be evicted, si:mu:me = 4:4:1
-    cache.cacheBlock(memoryBlocks[0].cacheKey, memoryBlocks[0], true, false);
+    cache.cacheBlock(memoryBlocks[0].cacheKey, memoryBlocks[0], true);
     // Single eviction, one block evicted
     assertEquals(1, cache.getStats().getEvictionCount());
     assertEquals(1, cache.getStats().getEvictedCount());
@@ -486,7 +486,7 @@ public class TestLruBlockCache {
     assertEquals(null, cache.getBlock(singleBlocks[0].cacheKey, true, false, true));
 
     // 2. Insert another memory block, another single evicted, si:mu:me = 3:4:2
-    cache.cacheBlock(memoryBlocks[1].cacheKey, memoryBlocks[1], true, false);
+    cache.cacheBlock(memoryBlocks[1].cacheKey, memoryBlocks[1], true);
     // Two evictions, two evicted.
     assertEquals(2, cache.getStats().getEvictionCount());
     assertEquals(2, cache.getStats().getEvictedCount());
@@ -494,10 +494,10 @@ public class TestLruBlockCache {
     assertEquals(null, cache.getBlock(singleBlocks[1].cacheKey, true, false, true));
 
     // 3. Insert 4 memory blocks, 2 single and 2 multi evicted, si:mu:me = 1:2:6
-    cache.cacheBlock(memoryBlocks[2].cacheKey, memoryBlocks[2], true, false);
+    cache.cacheBlock(memoryBlocks[2].cacheKey, memoryBlocks[2], true);
-    cache.cacheBlock(memoryBlocks[3].cacheKey, memoryBlocks[3], true, false);
+    cache.cacheBlock(memoryBlocks[3].cacheKey, memoryBlocks[3], true);
-    cache.cacheBlock(memoryBlocks[4].cacheKey, memoryBlocks[4], true, false);
+    cache.cacheBlock(memoryBlocks[4].cacheKey, memoryBlocks[4], true);
-    cache.cacheBlock(memoryBlocks[5].cacheKey, memoryBlocks[5], true, false);
+    cache.cacheBlock(memoryBlocks[5].cacheKey, memoryBlocks[5], true);
     // Three evictions, three evicted.
     assertEquals(6, cache.getStats().getEvictionCount());
     assertEquals(6, cache.getStats().getEvictedCount());
@@ -509,9 +509,9 @@ public class TestLruBlockCache {
 
     // 4. Insert 3 memory blocks, the remaining 1 single and 2 multi evicted
     // si:mu:me = 0:0:9
-    cache.cacheBlock(memoryBlocks[6].cacheKey, memoryBlocks[6], true, false);
+    cache.cacheBlock(memoryBlocks[6].cacheKey, memoryBlocks[6], true);
-    cache.cacheBlock(memoryBlocks[7].cacheKey, memoryBlocks[7], true, false);
+    cache.cacheBlock(memoryBlocks[7].cacheKey, memoryBlocks[7], true);
-    cache.cacheBlock(memoryBlocks[8].cacheKey, memoryBlocks[8], true, false);
+    cache.cacheBlock(memoryBlocks[8].cacheKey, memoryBlocks[8], true);
     // Three evictions, three evicted.
     assertEquals(9, cache.getStats().getEvictionCount());
     assertEquals(9, cache.getStats().getEvictedCount());
@@ -522,7 +522,7 @@ public class TestLruBlockCache {
 
     // 5. Insert one memory block, the oldest memory evicted
     // si:mu:me = 0:0:9
-    cache.cacheBlock(memoryBlocks[9].cacheKey, memoryBlocks[9], true, false);
+    cache.cacheBlock(memoryBlocks[9].cacheKey, memoryBlocks[9], true);
     // one eviction, one evicted.
     assertEquals(10, cache.getStats().getEvictionCount());
     assertEquals(10, cache.getStats().getEvictedCount());
@@ -679,7 +679,7 @@ public class TestLruBlockCache {
       cache.getBlock(multiBlocks[i].cacheKey, true, false, true);
 
       // Add memory blocks as such
-      cache.cacheBlock(memoryBlocks[i].cacheKey, memoryBlocks[i], true, false);
+      cache.cacheBlock(memoryBlocks[i].cacheKey, memoryBlocks[i], true);
     }
 
     // Do not expect any evictions yet

hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestBucketCache.java

@@ -104,12 +104,11 @@ public class TestBucketCache {
     }
 
     @Override
-    public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
+    public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) {
-        boolean cacheDataInL1) {
       if (super.getBlock(cacheKey, true, false, true) != null) {
         throw new RuntimeException("Cached an already cached block");
       }
-      super.cacheBlock(cacheKey, buf, inMemory, cacheDataInL1);
+      super.cacheBlock(cacheKey, buf, inMemory);
     }
 
     @Override

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHeapMemoryManager.java

@@ -645,8 +645,7 @@ public class TestHeapMemoryManager {
     }
 
     @Override
-    public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory,
+    public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) {
-        boolean cacheDataInL1) {
 
     }