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 <div class="subTitle">org.apache.hadoop.hbase.io.hfile</div>
 <h2 title="Class LruAdaptiveBlockCache" class="title">Class LruAdaptiveBlockCache</h2>
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 <dt>All Implemented Interfaces:</dt>
 <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Iterable.html?is-external=true" title="class or interface in java.lang">Iterable</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CachedBlock.html" title="interface in org.apache.hadoop.hbase.io.hfile">CachedBlock</a>&gt;, <a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html" title="interface in org.apache.hadoop.hbase.io">HeapSize</a>, <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a>, <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">FirstLevelBlockCache</a>, <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ResizableBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">ResizableBlockCache</a></dd>
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 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.149">LruAdaptiveBlockCache</a>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
 implements <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">FirstLevelBlockCache</a></pre>
 <div class="block"><b>This realisation improve performance of classical LRU
  cache up to 3 times via reduce GC job.</b>
  </p>
  The classical block cache implementation that is memory-aware using <a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html" title="interface in org.apache.hadoop.hbase.io"><code>HeapSize</code></a>,
  memory-bound using an
  LRU eviction algorithm, and concurrent: backed by a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentHashMap</code></a> and with a
  non-blocking eviction thread giving constant-time <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-boolean-"><code>cacheBlock(org.apache.hadoop.hbase.io.hfile.BlockCacheKey, org.apache.hadoop.hbase.io.hfile.Cacheable, boolean)</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-boolean-boolean-boolean-"><code>getBlock(org.apache.hadoop.hbase.io.hfile.BlockCacheKey, boolean, boolean, boolean)</code></a>
  operations.
  </p>
  Contains three levels of block priority to allow for scan-resistance and in-memory families
  <a href="../../../../../../org/apache/hadoop/hbase/client/ColumnFamilyDescriptorBuilder.html#setInMemory-boolean-"><code>ColumnFamilyDescriptorBuilder.setInMemory(boolean)</code></a> (An
  in-memory column family is a column family that should be served from memory if possible):
  single-access, multiple-accesses, and in-memory priority. A block is added with an in-memory
  priority flag if <a href="../../../../../../org/apache/hadoop/hbase/client/ColumnFamilyDescriptor.html#isInMemory--"><code>ColumnFamilyDescriptor.isInMemory()</code></a>,
  otherwise a block becomes a single access priority the first time it is read into this block
  cache. If a block is accessed again while in cache, it is marked as a multiple access priority
  block. This delineation of blocks is used to prevent scans from thrashing the cache adding a
  least-frequently-used element to the eviction algorithm.
  <p/>
  Each priority is given its own chunk of the total cache to ensure fairness during eviction. Each
  priority will retain close to its maximum size, however, if any priority is not using its entire
  chunk the others are able to grow beyond their chunk size.
  <p/>
  Instantiated at a minimum with the total size and average block size. All sizes are in bytes. The
  block size is not especially important as this cache is fully dynamic in its sizing of blocks. It
  is only used for pre-allocating data structures and in initial heap estimation of the map.
  <p/>
  The detailed constructor defines the sizes for the three priorities (they should total to the
  <code>maximum size</code> defined). It also sets the levels that trigger and control the eviction
  thread.
  <p/>
  The <code>acceptable size</code> is the cache size level which triggers the eviction process to
  start. It evicts enough blocks to get the size below the minimum size specified.
  <p/>
  Eviction happens in a separate thread and involves a single full-scan of the map. It determines
  how many bytes must be freed to reach the minimum size, and then while scanning determines the
  fewest least-recently-used blocks necessary from each of the three priorities (would be 3 times
  bytes to free). It then uses the priority chunk sizes to evict fairly according to the relative
  sizes and usage.
  <p/>
  Adaptive LRU cache lets speed up performance while we are reading much more data than can fit
  into BlockCache and it is the cause of a high rate of evictions. This in turn leads to heavy
  Garbage Collector works. So a lot of blocks put into BlockCache but never read, but spending
  a lot of CPU resources for cleaning. We could avoid this situation via parameters:
  <p/>
  <b>hbase.lru.cache.heavy.eviction.count.limit</b>  - set how many times we have to run the
  eviction process that starts to avoid putting data to BlockCache. By default it is 0 and it
  meats the feature will start at the beginning. But if we have some times short reading the same
  data and some times long-term reading - we can divide it by this parameter. For example we know
  that our short reading used to be about 1 minutes, then we have to set the parameter about 10
  and it will enable the feature only for long time massive reading (after ~100 seconds). So when
  we use short-reading and want all of them in the cache we will have it (except for eviction of
  course). When we use long-term heavy reading the feature will be enabled after some time and
  bring better performance.
  <p/>
  <b>hbase.lru.cache.heavy.eviction.mb.size.limit</b> - set how many bytes in 10 seconds desirable
  putting into BlockCache (and evicted from it). The feature will try to reach this value and
  maintain it. Don't try to set it too small because it leads to premature exit from this mode.
  For powerful CPUs (about 20-40 physical cores)  it could be about 400-500 MB. Average system
  (~10 cores) 200-300 MB. Some weak systems (2-5 cores) may be good with 50-100 MB.
  How it works: we set the limit and after each ~10 second calculate how many bytes were freed.
  Overhead = Freed Bytes Sum (MB) * 100 / Limit (MB) - 100;
  For example we set the limit = 500 and were evicted 2000 MB. Overhead is:
  2000 * 100 / 500 - 100 = 300%
  The feature is going to reduce a percent caching data blocks and fit evicted bytes closer to
  100% (500 MB). Some kind of an auto-scaling.
  If freed bytes less then the limit we have got negative overhead.
  For example if were freed 200 MB:
  200 * 100 / 500 - 100 = -60%
  The feature will increase the percent of caching blocks.
  That leads to fit evicted bytes closer to 100% (500 MB).
  The current situation we can find out in the log of RegionServer:
  BlockCache evicted (MB): 0, overhead (%): -100, heavy eviction counter: 0, current caching
  DataBlock (%): 100 - means no eviction, 100% blocks is caching
  BlockCache evicted (MB): 2000, overhead (%): 300, heavy eviction counter: 1, current caching
  DataBlock (%): 97 - means eviction begin, reduce of caching blocks by 3%.
  It help to tune your system and find out what value is better set. Don't try to reach 0%
  overhead, it is impossible. Quite good 50-100% overhead,
  it prevents premature exit from this mode.
  <p/>
  <b>hbase.lru.cache.heavy.eviction.overhead.coefficient</b> - set how fast we want to get the
  result. If we know that our reading is heavy for a long time, we don't want to wait and can
  increase the coefficient and get good performance sooner. But if we aren't sure we can do it
  slowly and it could prevent premature exit from this mode. So, when the coefficient is higher
  we can get better performance when heavy reading is stable. But when reading is changing we
  can adjust to it and set  the coefficient to lower value.
  For example, we set the coefficient = 0.01. It means the overhead (see above) will be
  multiplied by 0.01 and the result is the value of reducing percent caching blocks. For example,
  if the overhead = 300% and the coefficient = 0.01,
  then percent of caching blocks will reduce by 3%.
  Similar logic when overhead has got negative value (overshooting).  Maybe it is just short-term
  fluctuation and we will try to stay in this mode. It helps avoid premature exit during
  short-term fluctuation. Backpressure has simple logic: more overshooting - more caching blocks.
  <p/>
  Find more information about improvement: https://issues.apache.org/jira/browse/HBASE-23887</div>
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 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Class and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.BlockBucket.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.BlockBucket</a></span></code>
 <div class="block">Used to group blocks into priority buckets.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.EvictionThread</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.StatisticsThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.StatisticsThread</a></span></code>&nbsp;</td>
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 <!-- =========== FIELD SUMMARY =========== -->
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 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation">
 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#acceptableFactor">acceptableFactor</a></span></code>
 <div class="block">Acceptable size of cache (no evictions if size < acceptable)</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#blockSize">blockSize</a></span></code>
 <div class="block">Approximate block size</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#CACHE_FIXED_OVERHEAD">CACHE_FIXED_OVERHEAD</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#cacheDataBlockPercent">cacheDataBlockPercent</a></span></code>
 <div class="block">Percent of cached data blocks</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#count">count</a></span></code>
 <div class="block">Cache access count (sequential ID)</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/LongAdder.html?is-external=true" title="class or interface in java.util.concurrent.atomic">LongAdder</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#dataBlockElements">dataBlockElements</a></span></code>
 <div class="block">Current number of cached data block elements</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/LongAdder.html?is-external=true" title="class or interface in java.util.concurrent.atomic">LongAdder</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#dataBlockSize">dataBlockSize</a></span></code>
 <div class="block">Current size of data blocks</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_ACCEPTABLE_FACTOR">DEFAULT_ACCEPTABLE_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_CONCURRENCY_LEVEL">DEFAULT_CONCURRENCY_LEVEL</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_HARD_CAPACITY_LIMIT_FACTOR">DEFAULT_HARD_CAPACITY_LIMIT_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_IN_MEMORY_FORCE_MODE">DEFAULT_IN_MEMORY_FORCE_MODE</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_LOAD_FACTOR">DEFAULT_LOAD_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_LRU_CACHE_HEAVY_EVICTION_COUNT_LIMIT">DEFAULT_LRU_CACHE_HEAVY_EVICTION_COUNT_LIMIT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_LRU_CACHE_HEAVY_EVICTION_MB_SIZE_LIMIT">DEFAULT_LRU_CACHE_HEAVY_EVICTION_MB_SIZE_LIMIT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_LRU_CACHE_HEAVY_EVICTION_OVERHEAD_COEFFICIENT">DEFAULT_LRU_CACHE_HEAVY_EVICTION_OVERHEAD_COEFFICIENT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_MAX_BLOCK_SIZE">DEFAULT_MAX_BLOCK_SIZE</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_MEMORY_FACTOR">DEFAULT_MEMORY_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_MIN_FACTOR">DEFAULT_MIN_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_MULTI_FACTOR">DEFAULT_MULTI_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#DEFAULT_SINGLE_FACTOR">DEFAULT_SINGLE_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#elements">elements</a></span></code>
 <div class="block">Current number of cached elements</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictionInProgress">evictionInProgress</a></span></code>
 <div class="block">Volatile boolean to track if we are in an eviction process or not</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html?is-external=true" title="class or interface in java.util.concurrent.locks">ReentrantLock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictionLock">evictionLock</a></span></code>
 <div class="block">Eviction lock (locked when eviction in process)</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.EvictionThread</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictionThread">evictionThread</a></span></code>
 <div class="block">Eviction thread</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#forceInMemory">forceInMemory</a></span></code>
 <div class="block">Whether in-memory hfile's data block has higher priority when evicting</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#hardCapacityLimitFactor">hardCapacityLimitFactor</a></span></code>
 <div class="block">hard capacity limit</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#heavyEvictionCountLimit">heavyEvictionCountLimit</a></span></code>
 <div class="block">Limit of count eviction process when start to avoid to cache blocks</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#heavyEvictionMbSizeLimit">heavyEvictionMbSizeLimit</a></span></code>
 <div class="block">Limit of volume eviction process when start to avoid to cache blocks</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#heavyEvictionOverheadCoefficient">heavyEvictionOverheadCoefficient</a></span></code>
 <div class="block">Adjust auto-scaling via overhead of evition rate</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static org.slf4j.Logger</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LOG">LOG</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_ACCEPTABLE_FACTOR_CONFIG_NAME">LRU_ACCEPTABLE_FACTOR_CONFIG_NAME</a></span></code>
 <div class="block">Acceptable size of cache (no evictions if size < acceptable)</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_CACHE_HEAVY_EVICTION_COUNT_LIMIT">LRU_CACHE_HEAVY_EVICTION_COUNT_LIMIT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_CACHE_HEAVY_EVICTION_MB_SIZE_LIMIT">LRU_CACHE_HEAVY_EVICTION_MB_SIZE_LIMIT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_CACHE_HEAVY_EVICTION_OVERHEAD_COEFFICIENT">LRU_CACHE_HEAVY_EVICTION_OVERHEAD_COEFFICIENT</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_HARD_CAPACITY_LIMIT_FACTOR_CONFIG_NAME">LRU_HARD_CAPACITY_LIMIT_FACTOR_CONFIG_NAME</a></span></code>
 <div class="block">Hard capacity limit of cache, will reject any put if size > this * acceptable</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_IN_MEMORY_FORCE_MODE_CONFIG_NAME">LRU_IN_MEMORY_FORCE_MODE_CONFIG_NAME</a></span></code>
 <div class="block">Configuration key to force data-block always (except in-memory are too much)
  cached in memory for in-memory hfile, unlike inMemory, which is a column-family
  configuration, inMemoryForceMode is a cluster-wide configuration</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_MAX_BLOCK_SIZE">LRU_MAX_BLOCK_SIZE</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_MEMORY_PERCENTAGE_CONFIG_NAME">LRU_MEMORY_PERCENTAGE_CONFIG_NAME</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_MIN_FACTOR_CONFIG_NAME">LRU_MIN_FACTOR_CONFIG_NAME</a></span></code>
 <div class="block">Percentage of total size that eviction will evict until; e.g.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_MULTI_PERCENTAGE_CONFIG_NAME">LRU_MULTI_PERCENTAGE_CONFIG_NAME</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LRU_SINGLE_PERCENTAGE_CONFIG_NAME">LRU_SINGLE_PERCENTAGE_CONFIG_NAME</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentHashMap</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>,<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#map">map</a></span></code>
 <div class="block">Defined the cache map as <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentHashMap.html?is-external=true" title="class or interface in java.util.concurrent"><code>ConcurrentHashMap</code></a> here, because in
  <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-boolean-boolean-boolean-"><code>getBlock(org.apache.hadoop.hbase.io.hfile.BlockCacheKey, boolean, boolean, boolean)</code></a>, we need to guarantee the atomicity
  of map#computeIfPresent (key, func).</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#maxBlockSize">maxBlockSize</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#maxSize">maxSize</a></span></code>
 <div class="block">Maximum allowable size of cache (block put if size > max, evict)</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#memoryFactor">memoryFactor</a></span></code>
 <div class="block">In-memory bucket size</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#minFactor">minFactor</a></span></code>
 <div class="block">Minimum threshold of cache (when evicting, evict until size < min)</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#multiFactor">multiFactor</a></span></code>
 <div class="block">Multiple access bucket size</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#overhead">overhead</a></span></code>
 <div class="block">Overhead of the structure itself</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ScheduledExecutorService</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#scheduleThreadPool">scheduleThreadPool</a></span></code>
 <div class="block">Statistics thread schedule pool (for heavy debugging, could remove)</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private float</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#singleFactor">singleFactor</a></span></code>
 <div class="block">Single access bucket size</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicLong</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#size">size</a></span></code>
 <div class="block">Current size of cache</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#STAT_THREAD_PERIOD">STAT_THREAD_PERIOD</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheStats.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheStats</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#stats">stats</a></span></code>
 <div class="block">Cache statistics</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#victimHandler">victimHandler</a></span></code>
 <div class="block">Where to send victims (blocks evicted/missing from the cache).</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
 <!-- ======== CONSTRUCTOR SUMMARY ======== -->
 <ul class="blockList">
 <li class="blockList"><a name="constructor.summary">
 <!--   -->
 </a>
 <h3>Constructor Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
 <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colOne" scope="col">Constructor and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LruAdaptiveBlockCache-long-long-">LruAdaptiveBlockCache</a></span>(long&nbsp;maxSize,
                      long&nbsp;blockSize)</code>
 <div class="block">Default constructor.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LruAdaptiveBlockCache-long-long-boolean-">LruAdaptiveBlockCache</a></span>(long&nbsp;maxSize,
                      long&nbsp;blockSize,
                      boolean&nbsp;evictionThread)</code>
 <div class="block">Constructor used for testing.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LruAdaptiveBlockCache-long-long-boolean-org.apache.hadoop.conf.Configuration-">LruAdaptiveBlockCache</a></span>(long&nbsp;maxSize,
                      long&nbsp;blockSize,
                      boolean&nbsp;evictionThread,
                      org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LruAdaptiveBlockCache-long-long-boolean-int-float-int-float-float-float-float-float-float-boolean-long-int-long-float-">LruAdaptiveBlockCache</a></span>(long&nbsp;maxSize,
                      long&nbsp;blockSize,
                      boolean&nbsp;evictionThread,
                      int&nbsp;mapInitialSize,
                      float&nbsp;mapLoadFactor,
                      int&nbsp;mapConcurrencyLevel,
                      float&nbsp;minFactor,
                      float&nbsp;acceptableFactor,
                      float&nbsp;singleFactor,
                      float&nbsp;multiFactor,
                      float&nbsp;memoryFactor,
                      float&nbsp;hardLimitFactor,
                      boolean&nbsp;forceInMemory,
                      long&nbsp;maxBlockSize,
                      int&nbsp;heavyEvictionCountLimit,
                      long&nbsp;heavyEvictionMbSizeLimit,
                      float&nbsp;heavyEvictionOverheadCoefficient)</code>
 <div class="block">Configurable constructor.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#LruAdaptiveBlockCache-long-long-org.apache.hadoop.conf.Configuration-">LruAdaptiveBlockCache</a></span>(long&nbsp;maxSize,
                      long&nbsp;blockSize,
                      org.apache.hadoop.conf.Configuration&nbsp;conf)</code>&nbsp;</td>
 </tr>
 </table>
 </li>
 </ul>
 <!-- ========== METHOD SUMMARY =========== -->
 <ul class="blockList">
 <li class="blockList"><a name="method.summary">
 <!--   -->
 </a>
 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#acceptableSize--">acceptableSize</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#asReferencedHeapBlock-org.apache.hadoop.hbase.io.hfile.Cacheable-">asReferencedHeapBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf)</code>
 <div class="block">The block cached in LruAdaptiveBlockCache will always be an heap block: on the one side,
  the heap access will be more faster then off-heap, the small index block or meta block
  cached in CombinedBlockCache will benefit a lot.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>private static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#assertCounterSanity-long-long-">assertCounterSanity</a></span>(long&nbsp;mapSize,
                    long&nbsp;counterVal)</code>
 <div class="block">Sanity-checking for parity between actual block cache content and metrics.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-">cacheBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
           <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf)</code>
 <div class="block">Cache the block with the specified name and buffer.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-boolean-">cacheBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
           <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf,
           boolean&nbsp;inMemory)</code>
 <div class="block">Cache the block with the specified name and buffer.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>private static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#calculateOverhead-long-long-int-">calculateOverhead</a></span>(long&nbsp;maxSize,
                  long&nbsp;blockSize,
                  int&nbsp;concurrency)</code>&nbsp;</td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#clearCache--">clearCache</a></span>()</code>
 <div class="block">Clears the cache.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#containsBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">containsBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey)</code>
 <div class="block">Whether the cache contains block with specified cacheKey</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evict--">evict</a></span>()</code>
 <div class="block">Eviction method.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">evictBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey)</code>
 <div class="block">Evict block from cache.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>protected long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictBlock-org.apache.hadoop.hbase.io.hfile.LruCachedBlock-boolean-">evictBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&nbsp;block,
           boolean&nbsp;evictedByEvictionProcess)</code>
 <div class="block">Evict the block, and it will be cached by the victim handler if exists &amp;&amp;
  block may be read again later</div>
 </td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#evictBlocksByHfileName-java.lang.String-">evictBlocksByHfileName</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hfileName)</code>
 <div class="block">Evicts all blocks for a specific HFile.</div>
 </td>
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 <tr id="i12" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-boolean-boolean-boolean-">getBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
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 <div class="block">Get the buffer of the block with the specified name.</div>
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 <tr id="i13" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getBlockCaches--">getBlockCaches</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getBlockCount--">getBlockCount</a></span>()</code>
 <div class="block">Returns the number of blocks currently cached in the block cache.</div>
 </td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getCacheDataBlockPercent--">getCacheDataBlockPercent</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getCurrentDataSize--">getCurrentDataSize</a></span>()</code>
 <div class="block">Returns the occupied size of data blocks, in bytes.</div>
 </td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getCurrentSize--">getCurrentSize</a></span>()</code>
 <div class="block">Returns the occupied size of the block cache, in bytes.</div>
 </td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getDataBlockCount--">getDataBlockCount</a></span>()</code>
 <div class="block">Returns the number of data blocks currently cached in the block cache.</div>
 </td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.html" title="enum in org.apache.hadoop.hbase.io.encoding">DataBlockEncoding</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getEncodingCountsForTest--">getEncodingCountsForTest</a></span>()</code>&nbsp;</td>
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 <tr id="i20" class="altColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruAdaptiveBlockCache.EvictionThread</a></code></td>
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 <tr id="i21" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getFreeSize--">getFreeSize</a></span>()</code>
 <div class="block">Returns the free size of the block cache, in bytes.</div>
 </td>
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 <tr id="i22" class="altColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>,<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getMapForTests--">getMapForTests</a></span>()</code>&nbsp;</td>
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 <tr id="i23" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getMaxSize--">getMaxSize</a></span>()</code>
 <div class="block">Get the maximum size of this cache.</div>
 </td>
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 <tr id="i24" class="altColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getOverhead--">getOverhead</a></span>()</code>&nbsp;</td>
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 <tr id="i25" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheStats.html" title="class in org.apache.hadoop.hbase.io.hfile">CacheStats</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#getStats--">getStats</a></span>()</code>
 <div class="block">Get counter statistics for this cache.</div>
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 <tr id="i26" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#heapSize--">heapSize</a></span>()</code>&nbsp;</td>
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 <tr id="i27" class="rowColor">
 <td class="colFirst"><code>(package private) boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#isEvictionInProgress--">isEvictionInProgress</a></span>()</code>&nbsp;</td>
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 <tr id="i28" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html?is-external=true" title="class or interface in java.util">Iterator</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CachedBlock.html" title="interface in org.apache.hadoop.hbase.io.hfile">CachedBlock</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#iterator--">iterator</a></span>()</code>&nbsp;</td>
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 <tr id="i29" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#logStats--">logStats</a></span>()</code>&nbsp;</td>
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 <tr id="i30" class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#memorySize--">memorySize</a></span>()</code>&nbsp;</td>
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 <tr id="i31" class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#minSize--">minSize</a></span>()</code>&nbsp;</td>
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 <tr id="i32" class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#multiSize--">multiSize</a></span>()</code>&nbsp;</td>
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 <tr id="i33" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#runEviction--">runEviction</a></span>()</code>
 <div class="block">Multi-threaded call to run the eviction process.</div>
 </td>
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 <tr id="i34" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#setMaxSize-long-">setMaxSize</a></span>(long&nbsp;maxSize)</code>
 <div class="block">Sets the max heap size that can be used by the BlockCache.</div>
 </td>
 </tr>
 <tr id="i35" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#setVictimCache-org.apache.hadoop.hbase.io.hfile.BlockCache-">setVictimCache</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a>&nbsp;victimCache)</code>
 <div class="block">Specifies the secondary cache.</div>
 </td>
 </tr>
 <tr id="i36" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#shutdown--">shutdown</a></span>()</code>
 <div class="block">Shutdown the cache.</div>
 </td>
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 <tr id="i37" class="rowColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#singleSize--">singleSize</a></span>()</code>&nbsp;</td>
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 <tr id="i38" class="altColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#size--">size</a></span>()</code>
 <div class="block">Returns the total size of the block cache, in bytes.</div>
 </td>
 </tr>
 <tr id="i39" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#toString--">toString</a></span>()</code>&nbsp;</td>
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 <tr id="i40" class="altColor">
 <td class="colFirst"><code>private long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#updateSizeMetrics-org.apache.hadoop.hbase.io.hfile.LruCachedBlock-boolean-">updateSizeMetrics</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&nbsp;cb,
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 <div class="block">Helper function that updates the local size counter and also updates any
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 <div class="block">Configuration key to force data-block always (except in-memory are too much)
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 <pre>private final&nbsp;int <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.310">heavyEvictionCountLimit</a></pre>
 <div class="block">Limit of count eviction process when start to avoid to cache blocks</div>
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 <pre>private final&nbsp;long <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.313">heavyEvictionMbSizeLimit</a></pre>
 <div class="block">Limit of volume eviction process when start to avoid to cache blocks</div>
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 <div class="block">Adjust auto-scaling via overhead of evition rate</div>
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 <pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.328">LruAdaptiveBlockCache</a>(long&nbsp;maxSize,
                              long&nbsp;blockSize)</pre>
 <div class="block">Default constructor.  Specify maximum size and expected average block
  size (approximation is fine).

  <p>All other factors will be calculated based on defaults specified in
  this class.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>maxSize</code> - maximum size of cache, in bytes</dd>
 <dd><code>blockSize</code> - approximate size of each block, in bytes</dd>
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 <pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.335">LruAdaptiveBlockCache</a>(long&nbsp;maxSize,
                              long&nbsp;blockSize,
                              boolean&nbsp;evictionThread)</pre>
 <div class="block">Constructor used for testing.  Allows disabling of the eviction thread.</div>
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 <pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.351">LruAdaptiveBlockCache</a>(long&nbsp;maxSize,
                              long&nbsp;blockSize,
                              boolean&nbsp;evictionThread,
                              org.apache.hadoop.conf.Configuration&nbsp;conf)</pre>
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 <pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.374">LruAdaptiveBlockCache</a>(long&nbsp;maxSize,
                              long&nbsp;blockSize,
                              org.apache.hadoop.conf.Configuration&nbsp;conf)</pre>
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 <pre>public&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.399">LruAdaptiveBlockCache</a>(long&nbsp;maxSize,
                              long&nbsp;blockSize,
                              boolean&nbsp;evictionThread,
                              int&nbsp;mapInitialSize,
                              float&nbsp;mapLoadFactor,
                              int&nbsp;mapConcurrencyLevel,
                              float&nbsp;minFactor,
                              float&nbsp;acceptableFactor,
                              float&nbsp;singleFactor,
                              float&nbsp;multiFactor,
                              float&nbsp;memoryFactor,
                              float&nbsp;hardLimitFactor,
                              boolean&nbsp;forceInMemory,
                              long&nbsp;maxBlockSize,
                              int&nbsp;heavyEvictionCountLimit,
                              long&nbsp;heavyEvictionMbSizeLimit,
                              float&nbsp;heavyEvictionOverheadCoefficient)</pre>
 <div class="block">Configurable constructor.  Use this constructor if not using defaults.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>maxSize</code> - maximum size of this cache, in bytes</dd>
 <dd><code>blockSize</code> - expected average size of blocks, in bytes</dd>
 <dd><code>evictionThread</code> - whether to run evictions in a bg thread or not</dd>
 <dd><code>mapInitialSize</code> - initial size of backing ConcurrentHashMap</dd>
 <dd><code>mapLoadFactor</code> - initial load factor of backing ConcurrentHashMap</dd>
 <dd><code>mapConcurrencyLevel</code> - initial concurrency factor for backing CHM</dd>
 <dd><code>minFactor</code> - percentage of total size that eviction will evict until</dd>
 <dd><code>acceptableFactor</code> - percentage of total size that triggers eviction</dd>
 <dd><code>singleFactor</code> - percentage of total size for single-access blocks</dd>
 <dd><code>multiFactor</code> - percentage of total size for multiple-access blocks</dd>
 <dd><code>memoryFactor</code> - percentage of total size for in-memory blocks</dd>
 <dd><code>hardLimitFactor</code> - hard capacity limit</dd>
 <dd><code>forceInMemory</code> - in-memory hfile's data block has higher priority when evicting</dd>
 <dd><code>maxBlockSize</code> - maximum block size for caching</dd>
 <dd><code>heavyEvictionCountLimit</code> - when starts AdaptiveLRU algoritm work</dd>
 <dd><code>heavyEvictionMbSizeLimit</code> - how many bytes desirable putting into BlockCache</dd>
 <dd><code>heavyEvictionOverheadCoefficient</code> - how aggressive AdaptiveLRU will reduce GC</dd>
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 <h4>setVictimCache</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.457">setVictimCache</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a>&nbsp;victimCache)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html#setVictimCache-org.apache.hadoop.hbase.io.hfile.BlockCache-">FirstLevelBlockCache</a></code></span></div>
 <div class="block">Specifies the secondary cache. An entry that is evicted from this cache due to a size
  constraint will be inserted into the victim cache.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html#setVictimCache-org.apache.hadoop.hbase.io.hfile.BlockCache-">setVictimCache</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">FirstLevelBlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>victimCache</code> - the second level cache</dd>
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 <h4>setMaxSize</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.465">setMaxSize</a>(long&nbsp;maxSize)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ResizableBlockCache.html#setMaxSize-long-">ResizableBlockCache</a></code></span></div>
 <div class="block">Sets the max heap size that can be used by the BlockCache.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ResizableBlockCache.html#setMaxSize-long-">setMaxSize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ResizableBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">ResizableBlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>maxSize</code> - The max heap size.</dd>
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 <pre>public&nbsp;int&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.472">getCacheDataBlockPercent</a>()</pre>
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 <pre>private&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.491">asReferencedHeapBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf)</pre>
 <div class="block">The block cached in LruAdaptiveBlockCache will always be an heap block: on the one side,
  the heap access will be more faster then off-heap, the small index block or meta block
  cached in CombinedBlockCache will benefit a lot. on other side, the LruAdaptiveBlockCache
  size is always calculated based on the total heap size, if caching an off-heap block in
  LruAdaptiveBlockCache, the heap size will be messed up. Here we will clone the block into an
  heap block if it's an off-heap block, otherwise just use the original block. The key point is
  maintain the refCnt of the block (HBASE-22127): <br>
  1. if cache the cloned heap block, its refCnt is an totally new one, it's easy to handle; <br>
  2. if cache the original heap block, we're sure that it won't be tracked in ByteBuffAllocator's
  reservoir, if both RPC and LruAdaptiveBlockCache release the block, then it can be garbage
  collected by JVM, so need a retain here.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>buf</code> - the original block</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>an block with an heap memory backend.</dd>
 </dl>
 </li>
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 <h4>cacheBlock</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.516">cacheBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
                        <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf,
                        boolean&nbsp;inMemory)</pre>
 <div class="block">Cache the block with the specified name and buffer.
  <p>
  It is assumed this will NOT be called on an already cached block. In rare cases (HBASE-8547)
  this can happen, for which we compare the buffer contents.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-boolean-">cacheBlock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - block's cache key</dd>
 <dd><code>buf</code> - block buffer</dd>
 <dd><code>inMemory</code> - if block is in-memory</dd>
 </dl>
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 <h4>assertCounterSanity</h4>
 <pre>private static&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.587">assertCounterSanity</a>(long&nbsp;mapSize,
                                         long&nbsp;counterVal)</pre>
 <div class="block">Sanity-checking for parity between actual block cache content and metrics.
  Intended only for use with TRACE level logging and -ea JVM.</div>
 </li>
 </ul>
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 <h4>cacheBlock</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.613">cacheBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
                        <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;buf)</pre>
 <div class="block">Cache the block with the specified name and buffer.
  <p>
  TODO after HBASE-22005, we may cache an block which allocated from off-heap, but our LRU cache
  sizing is based on heap size, so we should handle this in HBASE-22127. It will introduce an
  switch whether make the LRU on-heap or not, if so we may need copy the memory to on-heap,
  otherwise the caching size is based on off-heap.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#cacheBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-org.apache.hadoop.hbase.io.hfile.Cacheable-">cacheBlock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - block's cache key</dd>
 <dd><code>buf</code> - block buffer</dd>
 </dl>
 </li>
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 <a name="updateSizeMetrics-org.apache.hadoop.hbase.io.hfile.LruCachedBlock-boolean-">
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 <h4>updateSizeMetrics</h4>
 <pre>private&nbsp;long&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.622">updateSizeMetrics</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&nbsp;cb,
                                boolean&nbsp;evict)</pre>
 <div class="block">Helper function that updates the local size counter and also updates any
  per-cf or per-blocktype metrics it can discern from given
  <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>LruCachedBlock</code></a></div>
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 <h4>getBlock</h4>
 <pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.647">getBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey,
                           boolean&nbsp;caching,
                           boolean&nbsp;repeat,
                           boolean&nbsp;updateCacheMetrics)</pre>
 <div class="block">Get the buffer of the block with the specified name.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-boolean-boolean-boolean-">getBlock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - block's cache key</dd>
 <dd><code>caching</code> - true if the caller caches blocks on cache misses</dd>
 <dd><code>repeat</code> - Whether this is a repeat lookup for the same block
                            (used to avoid double counting cache misses when doing double-check
                            locking)</dd>
 <dd><code>updateCacheMetrics</code> - Whether to update cache metrics or not</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>buffer of specified cache key, or null if not in cache</dd>
 </dl>
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 <h4>containsBlock</h4>
 <pre>public&nbsp;boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.690">containsBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey)</pre>
 <div class="block">Whether the cache contains block with specified cacheKey</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html#containsBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">containsBlock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/FirstLevelBlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">FirstLevelBlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - cache key for the block</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true if contains the block</dd>
 </dl>
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 <h4>evictBlock</h4>
 <pre>public&nbsp;boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.695">evictBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile">BlockCacheKey</a>&nbsp;cacheKey)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#evictBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">BlockCache</a></code></span></div>
 <div class="block">Evict block from cache.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#evictBlock-org.apache.hadoop.hbase.io.hfile.BlockCacheKey-">evictBlock</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - Block to evict</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true if block existed and was evicted, false if not</dd>
 </dl>
 </li>
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 <a name="evictBlocksByHfileName-java.lang.String-">
 <!--   -->
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 <li class="blockList">
 <h4>evictBlocksByHfileName</h4>
 <pre>public&nbsp;int&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.711">evictBlocksByHfileName</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;hfileName)</pre>
 <div class="block">Evicts all blocks for a specific HFile. This is an
  expensive operation implemented as a linear-time search through all blocks
  in the cache. Ideally this should be a search in a log-access-time map.

  <p>
  This is used for evict-on-close to remove all blocks of a specific HFile.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#evictBlocksByHfileName-java.lang.String-">evictBlocksByHfileName</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html" title="interface in org.apache.hadoop.hbase.io.hfile">BlockCache</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the number of blocks evicted</dd>
 </dl>
 </li>
 </ul>
 <a name="evictBlock-org.apache.hadoop.hbase.io.hfile.LruCachedBlock-boolean-">
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 <h4>evictBlock</h4>
 <pre>protected&nbsp;long&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.728">evictBlock</a>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruCachedBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">LruCachedBlock</a>&nbsp;block,
                           boolean&nbsp;evictedByEvictionProcess)</pre>
 <div class="block">Evict the block, and it will be cached by the victim handler if exists &amp;&amp;
  block may be read again later</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>evictedByEvictionProcess</code> - true if the given block is evicted by
           EvictionThread</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the heap size of evicted block</dd>
 </dl>
 </li>
 </ul>
 <a name="runEviction--">
 <!--   -->
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 <h4>runEviction</h4>
 <pre>private&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.760">runEviction</a>()</pre>
 <div class="block">Multi-threaded call to run the eviction process.</div>
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 <h4>isEvictionInProgress</h4>
 <pre>boolean&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruAdaptiveBlockCache.html#line.768">isEvictionInProgress</a>()</pre>
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