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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.hadoop.hbase.io.hfile</a></div> |
| <h1 title="Interface HFileBlock.BlockIterator" class="title">Interface HFileBlock.BlockIterator</h1> |
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| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>Enclosing class:</dt> |
| <dd><a href="HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="modifiers">static interface </span><span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.html#line-1244">HFileBlock.BlockIterator</a></span></div> |
| <div class="block">Iterator for reading <a href="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> |
| </section> |
| <section class="summary"> |
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| <div class="table-header col-first">Modifier and Type</div> |
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| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#freeBlocks()" class="member-name-link">freeBlocks</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Now we use the <a href="../ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io"><code>ByteBuffAllocator</code></a> to manage the nio ByteBuffers for HFileBlocks, so we |
| must deallocate all of the ByteBuffers in the end life.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#nextBlock()" class="member-name-link">nextBlock</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Get the next block, or null if there are no more blocks to iterate.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#nextBlockWithBlockType(org.apache.hadoop.hbase.io.hfile.BlockType)" class="member-name-link">nextBlockWithBlockType</a><wbr>(<a href="BlockType.html" title="enum class in org.apache.hadoop.hbase.io.hfile">BlockType</a> blockType)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"> |
| <div class="block">Similar to <a href="#nextBlock()"><code>nextBlock()</code></a> but checks block type, throws an exception if incorrect, and |
| returns the HFile block</div> |
| </div> |
| </div> |
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| <h2>Method Details</h2> |
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| <section class="detail" id="nextBlock()"> |
| <h3>nextBlock</h3> |
| <div class="member-signature"><span class="return-type"><a href="HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html#line-1248">nextBlock</a></span>() |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block">Get the next block, or null if there are no more blocks to iterate.</div> |
| <dl class="notes"> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="nextBlockWithBlockType(org.apache.hadoop.hbase.io.hfile.BlockType)"> |
| <h3>nextBlockWithBlockType</h3> |
| <div class="member-signature"><span class="return-type"><a href="HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html#line-1254">nextBlockWithBlockType</a></span><wbr><span class="parameters">(<a href="BlockType.html" title="enum class in org.apache.hadoop.hbase.io.hfile">BlockType</a> blockType)</span> |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block">Similar to <a href="#nextBlock()"><code>nextBlock()</code></a> but checks block type, throws an exception if incorrect, and |
| returns the HFile block</div> |
| <dl class="notes"> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="freeBlocks()"> |
| <h3>freeBlocks</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name"><a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFileBlock.BlockIterator.html#line-1264">freeBlocks</a></span>()</div> |
| <div class="block">Now we use the <a href="../ByteBuffAllocator.html" title="class in org.apache.hadoop.hbase.io"><code>ByteBuffAllocator</code></a> to manage the nio ByteBuffers for HFileBlocks, so we |
| must deallocate all of the ByteBuffers in the end life. the BlockIterator's life cycle is |
| starting from opening an HFileReader and stopped when the HFileReader#close, so we will keep |
| track all the read blocks until we call <a href="#freeBlocks()"><code>freeBlocks()</code></a> when closing the |
| HFileReader. Sum bytes of those blocks in load-on-open section should be quite small, so |
| tracking them should be OK.</div> |
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