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 <div class="subTitle">org.apache.hadoop.hbase.io.hfile</div>
 <h2 title="Class HFileBlock" class="title">Class HFileBlock</h2>
 </div>
 <div class="contentContainer">
 <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.HFileBlock</li>
 </ul>
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 <dl>
 <dt>All Implemented Interfaces:</dt>
 <dd><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/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>, <a href="../../../../../../org/apache/hadoop/hbase/nio/HBaseReferenceCounted.html" title="interface in org.apache.hadoop.hbase.nio">HBaseReferenceCounted</a>, org.apache.hbase.thirdparty.io.netty.util.ReferenceCounted</dd>
 </dl>
 <dl>
 <dt>Direct Known Subclasses:</dt>
 <dd><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ExclusiveMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">ExclusiveMemHFileBlock</a>, <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/SharedMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">SharedMemHFileBlock</a></dd>
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 <hr>
 <br>
 <pre>@InterfaceAudience.Private
 public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.115">HFileBlock</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/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></pre>
 <div class="block">Cacheable Blocks of an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> version 2 file.
  Version 2 was introduced in hbase-0.92.0.

  <p>Version 1 was the original file block. Version 2 was introduced when we changed the hbase file
  format to support multi-level block indexes and compound bloom filters (HBASE-3857). Support
  for Version 1 was removed in hbase-1.3.0.

  <h3>HFileBlock: Version 2</h3>
  In version 2, a block is structured as follows:
  <ul>
  <li><b>Header:</b> See Writer#putHeader() for where header is written; header total size is
  HFILEBLOCK_HEADER_SIZE
  <ul>
  <li>0. blockType: Magic record identifying the <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile"><code>BlockType</code></a> (8 bytes):
  e.g. <code>DATABLK*</code>
  <li>1. onDiskSizeWithoutHeader: Compressed -- a.k.a 'on disk' -- block size, excluding header,
  but including tailing checksum bytes (4 bytes)
  <li>2. uncompressedSizeWithoutHeader: Uncompressed block size, excluding header, and excluding
  checksum bytes (4 bytes)
  <li>3. prevBlockOffset: The offset of the previous block of the same type (8 bytes). This is
  used to navigate to the previous block without having to go to the block index
  <li>4: For minorVersions &gt;=1, the ordinal describing checksum type (1 byte)
  <li>5: For minorVersions &gt;=1, the number of data bytes/checksum chunk (4 bytes)
  <li>6: onDiskDataSizeWithHeader: For minorVersions &gt;=1, the size of data 'on disk', including
  header, excluding checksums (4 bytes)
  </ul>
  </li>
  <li><b>Raw/Compressed/Encrypted/Encoded data:</b> The compression
  algorithm is the same for all the blocks in an <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a>. If compression is NONE, this is
  just raw, serialized Cells.
  <li><b>Tail:</b> For minorVersions &gt;=1, a series of 4 byte checksums, one each for
  the number of bytes specified by bytesPerChecksum.
  </ul>

  <h3>Caching</h3>
  Caches cache whole blocks with trailing checksums if any. We then tag on some metadata, the
  content of BLOCK_METADATA_SPACE which will be flag on if we are doing 'hbase'
  checksums and then the offset into the file which is needed when we re-make a cache key
  when we return the block to the cache as 'done'.
  See <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html#serialize-java.nio.ByteBuffer-boolean-"><code>Cacheable.serialize(ByteBuffer, boolean)</code></a> and <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html#getDeserializer--"><code>Cacheable.getDeserializer()</code></a>.

  <p>TODO: Should we cache the checksums? Down in Writer#getBlockForCaching(CacheConfig) where
  we make a block to cache-on-write, there is an attempt at turning off checksums. This is not the
  only place we get blocks to cache. We also will cache the raw return from an hdfs read. In this
  case, the checksums may be present. If the cache is backed by something that doesn't do ECC,
  say an SSD, we might want to preserve checksums. For now this is open question.
  <p>TODO: Over in BucketCache, we save a block allocation by doing a custom serialization.
  Be sure to change it if serialization changes in here. Could we add a method here that takes an
  IOEngine and that then serializes to it rather than expose our internals over in BucketCache?
  IOEngine is in the bucket subpackage. Pull it up? Then this class knows about bucketcache. Ugh.</div>
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 <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>static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockDeserializer.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockDeserializer</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static interface&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockIterator</a></span></code>
 <div class="block">Iterator for reading <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFileBlock</code></a>s in load-on-open-section, such as root data index
  block, meta index block, file info block etc.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>(package private) static interface&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockWritable.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.BlockWritable</a></span></code>
 <div class="block">Something that can be written into a block.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static interface&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.FSReader.html" title="interface in org.apache.hadoop.hbase.io.hfile">HFileBlock.FSReader</a></span></code>
 <div class="block">An HFile block reader with iteration ability.</div>
 </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/HFileBlock.FSReaderImpl.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.FSReaderImpl</a></span></code>
 <div class="block">Reads version 2 HFile blocks from the filesystem.</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/HFileBlock.Header.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.Header</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static class&nbsp;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.PrefetchedHeader.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.PrefetchedHeader</a></span></code>
 <div class="block">Data-structure to use caching the header of the NEXT block.</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/HFileBlock.Writer.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock.Writer</a></span></code>
 <div class="block">Unified version 2 <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> block writer.</div>
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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 <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io">ByteBuffAllocator</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#allocator">allocator</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile">CacheableDeserializer</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#BLOCK_DESERIALIZER">BLOCK_DESERIALIZER</a></span></code>
 <div class="block">Used deserializing blocks from Cache.</div>
 </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/HFileBlock.html#BLOCK_METADATA_SPACE">BLOCK_METADATA_SPACE</a></span></code>
 <div class="block">Space for metadata on a block that gets stored along with the block when we cache it.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#blockType">blockType</a></span></code>
 <div class="block">Type of block.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#buf">buf</a></span></code>
 <div class="block">The in-memory representation of the hfile block.</div>
 </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/HFileBlock.html#CHECKSUM_SIZE">CHECKSUM_SIZE</a></span></code>
 <div class="block">Each checksum value is an integer that can be stored in 4 bytes.</div>
 </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/HFileBlock.html#CHECKSUM_VERIFICATION_NUM_IO_THRESHOLD">CHECKSUM_VERIFICATION_NUM_IO_THRESHOLD</a></span></code>
 <div class="block">On a checksum failure, do these many succeeding read requests using hdfs checksums before
  auto-reenabling hbase checksum verification.</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/HFileBlock.html#DESERIALIZER_IDENTIFIER">DESERIALIZER_IDENTIFIER</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#DONT_FILL_HEADER">DONT_FILL_HEADER</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>(package private) static byte[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#DUMMY_HEADER_NO_CHECKSUM">DUMMY_HEADER_NO_CHECKSUM</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#fileContext">fileContext</a></span></code>
 <div class="block">Meta data that holds meta information on the hfileblock.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>static boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#FILL_HEADER">FILL_HEADER</a></span></code>&nbsp;</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/HFileBlock.html#FIXED_OVERHEAD">FIXED_OVERHEAD</a></span></code>&nbsp;</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/HFileBlock.html#LOG">LOG</a></span></code>&nbsp;</td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#MULTI_BYTE_BUFFER_HEAP_SIZE">MULTI_BYTE_BUFFER_HEAP_SIZE</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/HFileBlock.html#nextBlockOnDiskSize">nextBlockOnDiskSize</a></span></code>
 <div class="block">The on-disk size of the next block, including the header and checksums if present.</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/HFileBlock.html#offset">offset</a></span></code>
 <div class="block">The offset of this block in the file.</div>
 </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/HFileBlock.html#onDiskDataSizeWithHeader">onDiskDataSizeWithHeader</a></span></code>
 <div class="block">Size on disk of header + data.</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/HFileBlock.html#onDiskSizeWithoutHeader">onDiskSizeWithoutHeader</a></span></code>
 <div class="block">Size on disk excluding header, including checksum.</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/HFileBlock.html#prevBlockOffset">prevBlockOffset</a></span></code>
 <div class="block">The offset of the previous block on disk.</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/HFileBlock.html#uncompressedSizeWithoutHeader">uncompressedSizeWithoutHeader</a></span></code>
 <div class="block">Size of pure data.</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/HFileBlock.html#UNSET">UNSET</a></span></code>&nbsp;</td>
 </tr>
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 <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/HFileBlock.html#HFileBlock-org.apache.hadoop.hbase.io.hfile.BlockType-int-int-long-org.apache.hadoop.hbase.nio.ByteBuff-boolean-long-int-int-org.apache.hadoop.hbase.io.hfile.HFileContext-org.apache.hadoop.hbase.io.ByteBuffAllocator-">HFileBlock</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a>&nbsp;blockType,
           int&nbsp;onDiskSizeWithoutHeader,
           int&nbsp;uncompressedSizeWithoutHeader,
           long&nbsp;prevBlockOffset,
           <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a>&nbsp;buf,
           boolean&nbsp;fillHeader,
           long&nbsp;offset,
           int&nbsp;nextBlockOnDiskSize,
           int&nbsp;onDiskDataSizeWithHeader,
           <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a>&nbsp;fileContext,
           <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io">ByteBuffAllocator</a>&nbsp;allocator)</code>
 <div class="block">Creates a new <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>HFile</code></a> block from the given fields.</div>
 </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>private <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#addMetaData-java.nio.ByteBuffer-boolean-">addMetaData</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;destination,
            boolean&nbsp;includeNextBlockMetadata)</code>
 <div class="block">Adds metadata at current position (position is moved forward).</div>
 </td>
 </tr>
 <tr id="i1" 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/HFileBlock.html#allocateBuffer--">allocateBuffer</a></span>()</code>
 <div class="block">Always allocates a new buffer of the correct size.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>private static <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlockBuilder.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlockBuilder</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#createBuilder-org.apache.hadoop.hbase.io.hfile.HFileBlock-">createBuilder</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a>&nbsp;blk)</code>&nbsp;</td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>(package private) static <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#createFromBuff-org.apache.hadoop.hbase.nio.ByteBuff-boolean-long-int-org.apache.hadoop.hbase.io.hfile.HFileContext-org.apache.hadoop.hbase.io.ByteBuffAllocator-">createFromBuff</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a>&nbsp;buf,
               boolean&nbsp;usesHBaseChecksum,
               long&nbsp;offset,
               int&nbsp;nextBlockOnDiskSize,
               <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a>&nbsp;fileContext,
               <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io">ByteBuffAllocator</a>&nbsp;allocator)</code>
 <div class="block">Creates a block from an existing buffer starting with a header.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>(package private) static <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#deepCloneOnHeap-org.apache.hadoop.hbase.io.hfile.HFileBlock-">deepCloneOnHeap</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a>&nbsp;blk)</code>&nbsp;</td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#equals-java.lang.Object-">equals</a></span>(<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>&nbsp;comparison)</code>&nbsp;</td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getBlockType--">getBlockType</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getBufferReadOnly--">getBufferReadOnly</a></span>()</code>
 <div class="block">Returns a read-only duplicate of the buffer this block stores internally ready to be read.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getBufferWithoutHeader--">getBufferWithoutHeader</a></span>()</code>
 <div class="block">Returns a buffer that does not include the header and checksum.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getBufferWithoutHeader-boolean-">getBufferWithoutHeader</a></span>(boolean&nbsp;withChecksum)</code>
 <div class="block">Returns a buffer that does not include the header or checksum.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io">ByteBuffAllocator</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getByteBuffAllocator--">getByteBuffAllocator</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i11" class="rowColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getBytesPerChecksum--">getBytesPerChecksum</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i12" class="altColor">
 <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataInputStream.html?is-external=true" title="class or interface in java.io">DataInputStream</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getByteStream--">getByteStream</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i13" class="rowColor">
 <td class="colFirst"><code>(package private) byte</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getChecksumType--">getChecksumType</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i14" class="altColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.html" title="enum in org.apache.hadoop.hbase.io.encoding">DataBlockEncoding</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getDataBlockEncoding--">getDataBlockEncoding</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>(package private) short</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getDataBlockEncodingId--">getDataBlockEncodingId</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i16" class="altColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile">CacheableDeserializer</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getDeserializer--">getDeserializer</a></span>()</code>
 <div class="block">Returns CacheableDeserializer instance which reconstructs original object from ByteBuffer.</div>
 </td>
 </tr>
 <tr id="i17" class="rowColor">
 <td class="colFirst"><code>(package private) byte[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getDummyHeaderForVersion--">getDummyHeaderForVersion</a></span>()</code>
 <div class="block">Return the appropriate DUMMY_HEADER for the minor version</div>
 </td>
 </tr>
 <tr id="i18" class="altColor">
 <td class="colFirst"><code>private static byte[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getDummyHeaderForVersion-boolean-">getDummyHeaderForVersion</a></span>(boolean&nbsp;usesHBaseChecksum)</code>
 <div class="block">Return the appropriate DUMMY_HEADER for the minor version</div>
 </td>
 </tr>
 <tr id="i19" class="rowColor">
 <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getHFileContext--">getHFileContext</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i20" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getMetaData--">getMetaData</a></span>()</code>
 <div class="block">For use by bucketcache.</div>
 </td>
 </tr>
 <tr id="i21" class="rowColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getNextBlockOnDiskSize--">getNextBlockOnDiskSize</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i22" 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/HFileBlock.html#getOffset--">getOffset</a></span>()</code>
 <div class="block">Cannot be <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#UNSET"><code>UNSET</code></a>.</div>
 </td>
 </tr>
 <tr id="i23" class="rowColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getOnDiskDataSizeWithHeader--">getOnDiskDataSizeWithHeader</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i24" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getOnDiskSizeWithHeader--">getOnDiskSizeWithHeader</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i25" 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/HFileBlock.html#getOnDiskSizeWithHeader-org.apache.hadoop.hbase.nio.ByteBuff-boolean-">getOnDiskSizeWithHeader</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a>&nbsp;headerBuf,
                        boolean&nbsp;verifyChecksum)</code>
 <div class="block">Parse total on disk size including header and checksum.</div>
 </td>
 </tr>
 <tr id="i26" class="altColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getOnDiskSizeWithoutHeader--">getOnDiskSizeWithoutHeader</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i27" class="rowColor">
 <td class="colFirst"><code>(package private) long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getPrevBlockOffset--">getPrevBlockOffset</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i28" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getSerializedLength--">getSerializedLength</a></span>()</code>
 <div class="block">Returns the length of the ByteBuffer required to serialized the object.</div>
 </td>
 </tr>
 <tr id="i29" class="rowColor">
 <td class="colFirst"><code>(package private) int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#getUncompressedSizeWithoutHeader--">getUncompressedSizeWithoutHeader</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i30" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#hashCode--">hashCode</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i31" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#headerSize--">headerSize</a></span>()</code>
 <div class="block">Returns the size of this block header.</div>
 </td>
 </tr>
 <tr id="i32" class="altColor">
 <td class="colFirst"><code>static int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#headerSize-boolean-">headerSize</a></span>(boolean&nbsp;usesHBaseChecksum)</code>
 <div class="block">Maps a minor version to the size of the header.</div>
 </td>
 </tr>
 <tr id="i33" class="rowColor">
 <td class="colFirst"><code>long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#heapSize--">heapSize</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i34" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#isSharedMem--">isSharedMem</a></span>()</code>
 <div class="block">Will be override by <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/SharedMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>SharedMemHFileBlock</code></a> or <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ExclusiveMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>ExclusiveMemHFileBlock</code></a>.</div>
 </td>
 </tr>
 <tr id="i35" class="rowColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#isUnpacked--">isUnpacked</a></span>()</code>
 <div class="block">Return true when this block's buffer has been unpacked, false otherwise.</div>
 </td>
 </tr>
 <tr id="i36" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#overwriteHeader--">overwriteHeader</a></span>()</code>
 <div class="block">Rewinds <code>buf</code> and writes first 4 header fields.</div>
 </td>
 </tr>
 <tr id="i37" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#refCnt--">refCnt</a></span>()</code>
 <div class="block">Reference count of this Cacheable.</div>
 </td>
 </tr>
 <tr id="i38" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#release--">release</a></span>()</code>
 <div class="block">Call <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html#release--"><code>ByteBuff.release()</code></a> to decrease the reference count, if no other reference, it will
  return back the <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio"><code>ByteBuffer</code></a> to <a href="../../../../../../org/apache/hadoop/hbase/io/ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io"><code>ByteBuffAllocator</code></a></div>
 </td>
 </tr>
 <tr id="i39" class="rowColor">
 <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#retain--">retain</a></span>()</code>
 <div class="block">Increase its reference count, and only when no reference we can free the object's memory.</div>
 </td>
 </tr>
 <tr id="i40" 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/HFileBlock.html#sanityCheck--">sanityCheck</a></span>()</code>
 <div class="block">Checks if the block is internally consistent, i.e.</div>
 </td>
 </tr>
 <tr id="i41" 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/HFileBlock.html#sanityCheckAssertion-org.apache.hadoop.hbase.io.hfile.BlockType-org.apache.hadoop.hbase.io.hfile.BlockType-">sanityCheckAssertion</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a>&nbsp;valueFromBuf,
                     <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a>&nbsp;valueFromField)</code>&nbsp;</td>
 </tr>
 <tr id="i42" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#sanityCheckAssertion-long-long-java.lang.String-">sanityCheckAssertion</a></span>(long&nbsp;valueFromBuf,
                     long&nbsp;valueFromField,
                     <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;fieldName)</code>&nbsp;</td>
 </tr>
 <tr id="i43" class="rowColor">
 <td class="colFirst"><code>(package private) void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#sanityCheckUncompressed--">sanityCheckUncompressed</a></span>()</code>
 <div class="block">An additional sanity-check in case no compression or encryption is being used.</div>
 </td>
 </tr>
 <tr id="i44" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#serialize-java.nio.ByteBuffer-boolean-">serialize</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;destination,
          boolean&nbsp;includeNextBlockMetadata)</code>
 <div class="block">Serializes its data into destination.</div>
 </td>
 </tr>
 <tr id="i45" class="rowColor">
 <td class="colFirst"><code>(package private) static <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#shallowClone-org.apache.hadoop.hbase.io.hfile.HFileBlock-">shallowClone</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a>&nbsp;blk)</code>&nbsp;</td>
 </tr>
 <tr id="i46" class="altColor">
 <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/HFileBlock.html#toString--">toString</a></span>()</code>&nbsp;</td>
 </tr>
 <tr id="i47" class="rowColor">
 <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/HFileBlock.html#toStringHeader-org.apache.hadoop.hbase.nio.ByteBuff-">toStringHeader</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a>&nbsp;buf)</code>
 <div class="block">Convert the contents of the block header into a human readable string.</div>
 </td>
 </tr>
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  <p>Be careful reading from this <code>buf</code>. Duplicate and work on the duplicate or if
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  <p>TODO: Make this read-only once made.

  <p>We are using the ByteBuff type. ByteBuffer is not extensible yet we need to be able to have
  a ByteBuffer-like API across multiple ByteBuffers reading from a cache such as BucketCache.
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  UNSET if unknown.

  Blocks try to carry the size of the next block to read in this data member. Usually
  we get block sizes from the hfile index but sometimes the index is not available:
  e.g. when we read the indexes themselves (indexes are stored in blocks, we do not
  have an index for the indexes). Saves seeks especially around file open when
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 <div class="block">On a checksum failure, do these many succeeding read requests using hdfs checksums before
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  8 bytes are for the offset of this block (long) in the file. Offset is important because is is
  used when we remake the CacheKey when we return block to the cache when done. There is also
  a flag on whether checksumming is being done by hbase or not. See class comment for note on
  uncertain state of checksumming of blocks that come out of cache (should we or should we not?).
  Finally there are 4 bytes to hold the length of the next block which can save a seek on
  occasion if available.
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  ++++++++++++++
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                   long&nbsp;offset,
                   int&nbsp;nextBlockOnDiskSize,
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  is used only while writing blocks and caching,
  and is sitting in a byte buffer and we want to stuff the block into cache.

  <p>TODO: The caller presumes no checksumming
  <p>TODO: HFile block writer can also off-heap ? </p>
  required of this block instance since going into cache; checksum already verified on
  underlying block data pulled in from filesystem. Is that correct? What if cache is SSD?</div>
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 <dd><code>buf</code> - block buffer with header (<a href="../../../../../../org/apache/hadoop/hbase/HConstants.html#HFILEBLOCK_HEADER_SIZE"><code>HConstants.HFILEBLOCK_HEADER_SIZE</code></a> bytes)</dd>
 <dd><code>fillHeader</code> - when true, write the first 4 header fields into passed buffer.</dd>
 <dd><code>offset</code> - the file offset the block was read from</dd>
 <dd><code>onDiskDataSizeWithHeader</code> - see <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#onDiskDataSizeWithHeader"><code>onDiskDataSizeWithHeader</code></a></dd>
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                                  long&nbsp;offset,
                                  int&nbsp;nextBlockOnDiskSize,
                                  <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileContext.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileContext</a>&nbsp;fileContext,
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 <div class="block">Creates a block from an existing buffer starting with a header. Rewinds
  and takes ownership of the buffer. By definition of rewind, ignores the
  buffer position, but if you slice the buffer beforehand, it will rewind
  to that point.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>buf</code> - Has header, content, and trailing checksums if present.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>headerBuf</code> - Header ByteBuffer. Presumed exact size of header.</dd>
 <dd><code>verifyChecksum</code> - true if checksum verification is in use.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Size of the block with header included.</dd>
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 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the on-disk size of the next block (including the header size and any checksums if
    present) read by peeking into the next block's header; use as a hint when doing
    a read of the next block when scanning or running over a file.</dd>
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 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html#retain--">retain</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></code></dd>
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 <dd>the on-disk size of header + data part + checksum.</dd>
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 <dd>the on-disk size of the data part + checksum (header excluded).</dd>
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 <dd>the uncompressed size of data part (header and checksum excluded).</dd>
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 <pre>long&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.466">getPrevBlockOffset</a>()</pre>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the offset of the previous block of the same type in the file, or
          -1 if unknown</dd>
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 <div class="block">Rewinds <code>buf</code> and writes first 4 header fields. <code>buf</code> position
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 <div class="block">Returns a buffer that does not include the header and checksum.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the buffer with header skipped and checksum omitted.</dd>
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>withChecksum</code> - to indicate whether include the checksum or not.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the buffer with header skipped and checksum omitted.</dd>
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 <div class="block">Returns a read-only duplicate of the buffer this block stores internally ready to be read.
  Clients must not modify the buffer object though they may set position and limit on the
  returned buffer since we pass back a duplicate. This method has to be public because it is used
  in <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CompoundBloomFilter.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>CompoundBloomFilter</code></a> to avoid object creation on every Bloom
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  and any follow-on checksums if present.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the buffer of this block for read-only operations</dd>
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                                   long&nbsp;valueFromField,
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 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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                            throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <pre>void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.551">sanityCheck</a>()
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 <div class="block">Checks if the block is internally consistent, i.e. the first
  <a href="../../../../../../org/apache/hadoop/hbase/HConstants.html#HFILEBLOCK_HEADER_SIZE"><code>HConstants.HFILEBLOCK_HEADER_SIZE</code></a> bytes of the buffer contain a
  valid header consistent with the fields. Assumes a packed block structure.
  This function is primary for testing and debugging, and is not
  thread-safe, because it alters the internal buffer pointer.
  Used by tests only.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <a name="toString--">
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 <h4>toString</h4>
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 <dl>
 <dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code>&nbsp;in class&nbsp;<code><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></code></dd>
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 <div class="block">Retrieves the decompressed/decrypted view of this block. An encoded block remains in its
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 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <pre>private&nbsp;void&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.666">allocateBuffer</a>()</pre>
 <div class="block">Always allocates a new buffer of the correct size. Copies header bytes
  from the existing buffer. Does not change header fields.
  Reserve room to keep checksum bytes too.</div>
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 <div class="block">Return true when this block's buffer has been unpacked, false otherwise. Note this is a
  calculated heuristic, not tracked attribute of the block.</div>
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 <a name="getOffset--">
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 <pre>long&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.699">getOffset</a>()</pre>
 <div class="block">Cannot be <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html#UNSET"><code>UNSET</code></a>. Must be a legitimate value. Used re-making the <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockCacheKey.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>BlockCacheKey</code></a>
  when block is returned to the cache.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the offset of this block in the file it was read from</dd>
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 <h4>getByteStream</h4>
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 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a byte stream reading the data + checksum of this block</dd>
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 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html#heapSize--">heapSize</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/HeapSize.html" title="interface in org.apache.hadoop.hbase.io">HeapSize</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>Approximate 'exclusive deep size' of implementing object.  Includes
  count of payload and hosting object sizings.</dd>
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 <div class="block">Will be override by <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/SharedMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>SharedMemHFileBlock</code></a> or <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ExclusiveMemHFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile"><code>ExclusiveMemHFileBlock</code></a>. Return true
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 <div class="block">An additional sanity-check in case no compression or encryption is being used.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <div class="block">Returns the length of the ByteBuffer required to serialized the object. If the
  object cannot be serialized, it should return 0.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html#getSerializedLength--">getSerializedLength</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>int length in bytes of the serialized form or 0 if the object cannot be cached.</dd>
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 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html#serialize-java.nio.ByteBuffer-boolean-">Cacheable</a></code></span></div>
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 <h4>getDeserializer</h4>
 <pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile">CacheableDeserializer</a>&lt;<a href="../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>&gt;&nbsp;<a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line.1905">getDeserializer</a>()</pre>
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 <dl>
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