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 <div class="subTitle">org.apache.hadoop.hbase.io.hfile</div>
 <h2 title="Class LruBlockCache" class="title">Class LruBlockCache</h2>
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 <ul class="inheritance">
 <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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 <li>org.apache.hadoop.hbase.io.hfile.LruBlockCache</li>
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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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 <br>
 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.88">LruBlockCache</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">A 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/LruBlockCache.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/LruBlockCache.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.</div>
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 <h3>Nested Class Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Nested Class Summary table, listing nested classes, and an explanation">
 <caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
 <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/LruBlockCache.BlockBucket.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.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/LruBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.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/LruBlockCache.StatisticsThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.StatisticsThread</a></span></code>&nbsp;</td>
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 <!-- =========== FIELD SUMMARY =========== -->
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 <h3>Field Summary</h3>
 <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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.html#CACHE_FIXED_OVERHEAD">CACHE_FIXED_OVERHEAD</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/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/LruBlockCache.html#count">count</a></span></code>
 <div class="block">Cache access count (sequential ID)</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/LruBlockCache.html#dataBlockElements">dataBlockElements</a></span></code>
 <div class="block">Current number of cached data block elements</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/LruBlockCache.html#dataBlockSize">dataBlockSize</a></span></code>
 <div class="block">Current size of data blocks</div>
 </td>
 </tr>
 <tr class="altColor">
 <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/LruBlockCache.html#DEFAULT_ACCEPTABLE_FACTOR">DEFAULT_ACCEPTABLE_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <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/LruBlockCache.html#DEFAULT_CONCURRENCY_LEVEL">DEFAULT_CONCURRENCY_LEVEL</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/LruBlockCache.html#DEFAULT_HARD_CAPACITY_LIMIT_FACTOR">DEFAULT_HARD_CAPACITY_LIMIT_FACTOR</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#DEFAULT_IN_MEMORY_FORCE_MODE">DEFAULT_IN_MEMORY_FORCE_MODE</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <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/LruBlockCache.html#DEFAULT_LOAD_FACTOR">DEFAULT_LOAD_FACTOR</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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.EvictionThread</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.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/LruBlockCache.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/LruBlockCache.html#hardCapacityLimitFactor">hardCapacityLimitFactor</a></span></code>
 <div class="block">hard capacity limit</div>
 </td>
 </tr>
 <tr class="altColor">
 <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/LruBlockCache.html#LOG">LOG</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/LruBlockCache.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="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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.html#LruBlockCache-long-long-">LruBlockCache</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/LruBlockCache.html#LruBlockCache-long-long-boolean-">LruBlockCache</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/LruBlockCache.html#LruBlockCache-long-long-boolean-org.apache.hadoop.conf.Configuration-">LruBlockCache</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/LruBlockCache.html#LruBlockCache-long-long-boolean-int-float-int-float-float-float-float-float-float-boolean-long-">LruBlockCache</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)</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/LruBlockCache.html#LruBlockCache-long-long-org.apache.hadoop.conf.Configuration-">LruBlockCache</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/LruBlockCache.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/LruBlockCache.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 LRUBlockCache 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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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>
 </tr>
 <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/LruBlockCache.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,
         boolean&nbsp;caching,
         boolean&nbsp;repeat,
         boolean&nbsp;updateCacheMetrics)</code>
 <div class="block">Get the buffer of the block with the specified name.</div>
 </td>
 </tr>
 <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/LruBlockCache.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/LruBlockCache.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>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="class or interface in java.util">SortedSet</a>&lt;<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>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#getCachedFileNamesForTest--">getCachedFileNamesForTest</a></span>()</code>
 <div class="block">Used in testing.</div>
 </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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.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/LruBlockCache.html#getEncodingCountsForTest--">getEncodingCountsForTest</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.EvictionThread.html" title="class in org.apache.hadoop.hbase.io.hfile">LruBlockCache.EvictionThread</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#getEvictionThread--">getEvictionThread</a></span>()</code>&nbsp;</td>
 </tr>
 <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/LruBlockCache.html#getFreeSize--">getFreeSize</a></span>()</code>
 <div class="block">Returns the free size of the block cache, in bytes.</div>
 </td>
 </tr>
 <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/LruBlockCache.html#getMapForTests--">getMapForTests</a></span>()</code>&nbsp;</td>
 </tr>
 <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/LruBlockCache.html#getMaxSize--">getMaxSize</a></span>()</code>
 <div class="block">Get the maximum size of this cache.</div>
 </td>
 </tr>
 <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/LruBlockCache.html#getOverhead--">getOverhead</a></span>()</code>&nbsp;</td>
 </tr>
 <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/LruBlockCache.html#getStats--">getStats</a></span>()</code>
 <div class="block">Get counter statistics for this cache.</div>
 </td>
 </tr>
 <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/LruBlockCache.html#heapSize--">heapSize</a></span>()</code>&nbsp;</td>
 </tr>
 <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/LruBlockCache.html#isEvictionInProgress--">isEvictionInProgress</a></span>()</code>&nbsp;</td>
 </tr>
 <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>
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 <td class="colFirst"><code>void</code></td>
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 <td class="colFirst"><code>void</code></td>
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 <div class="block">Default constructor.  Specify maximum size and expected average block
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
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 <dd><code>blockSize</code> - approximate size of each block, in bytes</dd>
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                      org.apache.hadoop.conf.Configuration&nbsp;conf)</pre>
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                      int&nbsp;mapInitialSize,
                      float&nbsp;mapLoadFactor,
                      int&nbsp;mapConcurrencyLevel,
                      float&nbsp;minFactor,
                      float&nbsp;acceptableFactor,
                      float&nbsp;singleFactor,
                      float&nbsp;multiFactor,
                      float&nbsp;memoryFactor,
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 <div class="block">Configurable constructor.  Use this constructor if not using defaults.</div>
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 <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>
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 <div class="block">Specifies the secondary cache. An entry that is evicted from this cache due to a size
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 <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>
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 <dd><code>maxSize</code> - The max heap size.</dd>
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 <div class="block">The block cached in LRUBlockCache 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 LRUBlockCache size is always
  calculated based on the total heap size, if caching an off-heap block in LRUBlockCache, 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 LRUBlockCache release the block, then it can be garbage collected by
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 <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>
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 <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)
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 <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>
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 <div class="block">Sanity-checking for parity between actual block cache content and metrics.
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 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.477">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,
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 <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>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cacheKey</code> - block's cache key</dd>
 <dd><code>buf</code> - block buffer</dd>
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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">Evict block from cache.</div>
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 <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>
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 <dd>true if block existed and was evicted, false if not</dd>
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 <div class="block">Evicts all blocks for a specific HFile. This is an
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  in the cache. Ideally this should be a search in a log-access-time map.

  <p>
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 <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>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>evictedByEvictionProcess</code> - true if the given block is evicted by
           EvictionThread</dd>
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 <div class="block">Get the maximum size of this cache.</div>
 <dl>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getMaxSize--">getMaxSize</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>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getCurrentSize--">getCurrentSize</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>
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 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getCurrentDataSize--">BlockCache</a></code></span></div>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getCurrentDataSize--">getCurrentDataSize</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>
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 <pre>public&nbsp;long&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.889">getFreeSize</a>()</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getFreeSize--">BlockCache</a></code></span></div>
 <div class="block">Returns the free size of the block cache, in bytes.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getFreeSize--">getFreeSize</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>
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 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#size--">BlockCache</a></code></span></div>
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 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#size--">size</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>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getBlockCount--">getBlockCount</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>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getDataBlockCount--">getDataBlockCount</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>
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 <div class="block">Get counter statistics for this cache.

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 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getStats--">getStats</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>
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 <dt><span class="returnLabel">Returns:</span></dt>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#iterator--">iterator</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>
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 <div class="block">Shutdown the cache.</div>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#shutdown--">shutdown</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>
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 <pre>public&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.1178">clearCache</a>()</pre>
 <div class="block">Clears the cache. Used in tests.</div>
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 <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/SortedSet.html?is-external=true" title="class or interface in java.util">SortedSet</a>&lt;<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>&gt;&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.1188">getCachedFileNamesForTest</a>()</pre>
 <div class="block">Used in testing. May be very inefficient.</div>
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 <pre>public&nbsp;<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;&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.1196">getEncodingCountsForTest</a>()</pre>
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 <pre><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;&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/LruBlockCache.html#line.1206">getMapForTests</a>()</pre>
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 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCache.html#getBlockCaches--">getBlockCaches</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 list of sub blockcaches that make up this one; returns null if no sub caches.</dd>
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