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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.util</a></div> |
| <h1 title="Class ClassSize" class="title">Class ClassSize</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.hadoop.hbase.util.ClassSize</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="annotations">@Private |
| </span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-33">ClassSize</a></span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <div class="block">Class for determining the "size" of a class, an attempt to calculate the actual bytes that an |
| object of this class will occupy in memory The core of this class is taken from the Derby project</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <li> |
| <section class="nested-class-summary" id="nested-class-summary"> |
| <h2>Nested Class Summary</h2> |
| <div class="caption"><span>Nested Classes</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Class</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>private static class </code></div> |
| <div class="col-second even-row-color"><code><a href="ClassSize.MemoryLayout.html" class="type-name-link" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">MemoryLayout abstracts details about the JVM object layout.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private static class </code></div> |
| <div class="col-second odd-row-color"><code><a href="ClassSize.UnsafeLayout.html" class="type-name-link" title="class in org.apache.hadoop.hbase.util">ClassSize.UnsafeLayout</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">UnsafeLayout uses Unsafe to guesstimate the object-layout related parameters like object header |
| sizes and oop sizes See HBASE-15950.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="caption"><span>Fields</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#ARRAY" class="member-name-link">ARRAY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Array overhead</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#ARRAYLIST" class="member-name-link">ARRAYLIST</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for ArrayList(0)</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#ATOMIC_BOOLEAN" class="member-name-link">ATOMIC_BOOLEAN</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for AtomicBoolean</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#ATOMIC_INTEGER" class="member-name-link">ATOMIC_INTEGER</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for AtomicInteger</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#ATOMIC_LONG" class="member-name-link">ATOMIC_LONG</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for AtomicLong</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#ATOMIC_REFERENCE" class="member-name-link">ATOMIC_REFERENCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for AtomicReference</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#BYTE_BUFFER" class="member-name-link">BYTE_BUFFER</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for ByteBuffer</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CELL_ARRAY_MAP" class="member-name-link">CELL_ARRAY_MAP</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for CellArrayMap</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#CELL_ARRAY_MAP_ENTRY" class="member-name-link">CELL_ARRAY_MAP_ENTRY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for Cell Array Entry</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CELL_CHUNK_MAP" class="member-name-link">CELL_CHUNK_MAP</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for CellChunkMap</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#CELL_CHUNK_MAP_ENTRY" class="member-name-link">CELL_CHUNK_MAP_ENTRY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for Cell Chunk Map Entry</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CELL_FLAT_MAP" class="member-name-link">CELL_FLAT_MAP</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for CellFlatMap</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#CELL_SET" class="member-name-link">CELL_SET</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for CellSkipListSet</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CONCURRENT_HASHMAP" class="member-name-link">CONCURRENT_HASHMAP</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for ConcurrentHashMap</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#CONCURRENT_HASHMAP_ENTRY" class="member-name-link">CONCURRENT_HASHMAP_ENTRY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for ConcurrentHashMap.Entry</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CONCURRENT_HASHMAP_SEGMENT" class="member-name-link">CONCURRENT_HASHMAP_SEGMENT</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for ConcurrentHashMap.Segment</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#CONCURRENT_SKIPLISTMAP" class="member-name-link">CONCURRENT_SKIPLISTMAP</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for ConcurrentSkipListMap</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#CONCURRENT_SKIPLISTMAP_ENTRY" class="member-name-link">CONCURRENT_SKIPLISTMAP_ENTRY</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for ConcurrentSkipListMap Entry</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#COPYONWRITE_ARRAYLIST" class="member-name-link">COPYONWRITE_ARRAYLIST</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for CopyOnWriteArrayList</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#COPYONWRITE_ARRAYSET" class="member-name-link">COPYONWRITE_ARRAYSET</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for CopyOnWriteArraySet</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#INTEGER" class="member-name-link">INTEGER</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for an Integer</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#LINKEDLIST" class="member-name-link">LINKEDLIST</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for LinkedList(0)</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#LINKEDLIST_ENTRY" class="member-name-link">LINKEDLIST_ENTRY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for a single entry in LinkedList</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private static final org.slf4j.Logger</code></div> |
| <div class="col-second odd-row-color"><code><a href="#LOG" class="member-name-link">LOG</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#MAP_ENTRY" class="member-name-link">MAP_ENTRY</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for entry in map</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private static final <a href="ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#memoryLayout" class="member-name-link">memoryLayout</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#NON_SYNC_TIMERANGE_TRACKER" class="member-name-link">NON_SYNC_TIMERANGE_TRACKER</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for NonSyncTimeRangeTracker</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#OBJECT" class="member-name-link">OBJECT</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Object overhead is minimum 2 * reference size (8 bytes on 64-bit)</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#REENTRANT_LOCK" class="member-name-link">REENTRANT_LOCK</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for ReentrantReadWriteLock</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#REFERENCE" class="member-name-link">REFERENCE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Reference size is 8 bytes on 64-bit, 4 bytes on 32-bit</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#STORE_SERVICES" class="member-name-link">STORE_SERVICES</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#STRING" class="member-name-link">STRING</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">String overhead</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#SYNC_TIMERANGE_TRACKER" class="member-name-link">SYNC_TIMERANGE_TRACKER</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for SyncTimeRangeTracker</div> |
| </div> |
| <div class="col-first odd-row-color"><code>static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#TIMERANGE" class="member-name-link">TIMERANGE</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">Overhead for timerange</div> |
| </div> |
| <div class="col-first even-row-color"><code>static final int</code></div> |
| <div class="col-second even-row-color"><code><a href="#TREEMAP" class="member-name-link">TREEMAP</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Overhead for TreeMap</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private static final boolean</code></div> |
| <div class="col-second odd-row-color"><code><a href="#USE_UNSAFE_LAYOUT" class="member-name-link">USE_UNSAFE_LAYOUT</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">ClassSize</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static int</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#align(int)" class="member-name-link">align</a><wbr>(int num)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Aligns a number to 8.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static long</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#align(long)" class="member-name-link">align</a><wbr>(long num)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Aligns a number to 8.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static long</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#estimateBase(java.lang.Class,boolean)" class="member-name-link">estimateBase</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a> cl, |
| boolean debug)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Estimate the static space taken up by the fields of a class.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>private static long</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#estimateBaseFromCoefficients(int%5B%5D,boolean)" class="member-name-link">estimateBaseFromCoefficients</a><wbr>(int[] coeff, |
| boolean debug)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Estimate the static space taken up by a class instance given the coefficients returned by |
| getSizeCoefficients.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>private static <a href="ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getMemoryLayout()" class="member-name-link">getMemoryLayout</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>private static int[]</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getSizeCoefficients(java.lang.Class,boolean)" class="member-name-link">getSizeCoefficients</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a> cl, |
| boolean debug)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">The estimate of the size of a class instance depends on whether the JVM uses 32 or 64 bit |
| addresses, that is it depends on the size of an object reference.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#is32BitJVM()" class="member-name-link">is32BitJVM</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Determines if we are running in a 32-bit JVM.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static long</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#sizeOf(byte%5B%5D)" class="member-name-link">sizeOf</a><wbr>(byte[] b)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Calculate the memory consumption (in byte) of a byte array, including the array header and the |
| whole backing byte array.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static long</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#sizeOfByteArray(int)" class="member-name-link">sizeOfByteArray</a><wbr>(int len)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Calculate the memory consumption (in byte) of a part of a byte array, including the array |
| header and the part of the backing byte array.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#useUnsafeLayout()" class="member-name-link">useUnsafeLayout</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="LOG"> |
| <h3>LOG</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">org.slf4j.Logger</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-35">LOG</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ARRAY"> |
| <h3>ARRAY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-38">ARRAY</a></span></div> |
| <div class="block">Array overhead</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ARRAYLIST"> |
| <h3>ARRAYLIST</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-41">ARRAYLIST</a></span></div> |
| <div class="block">Overhead for ArrayList(0)</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="LINKEDLIST"> |
| <h3>LINKEDLIST</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-44">LINKEDLIST</a></span></div> |
| <div class="block">Overhead for LinkedList(0)</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="LINKEDLIST_ENTRY"> |
| <h3>LINKEDLIST_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-47">LINKEDLIST_ENTRY</a></span></div> |
| <div class="block">Overhead for a single entry in LinkedList</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="BYTE_BUFFER"> |
| <h3>BYTE_BUFFER</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-50">BYTE_BUFFER</a></span></div> |
| <div class="block">Overhead for ByteBuffer</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="INTEGER"> |
| <h3>INTEGER</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-53">INTEGER</a></span></div> |
| <div class="block">Overhead for an Integer</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="MAP_ENTRY"> |
| <h3>MAP_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-56">MAP_ENTRY</a></span></div> |
| <div class="block">Overhead for entry in map</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="OBJECT"> |
| <h3>OBJECT</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-59">OBJECT</a></span></div> |
| <div class="block">Object overhead is minimum 2 * reference size (8 bytes on 64-bit)</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="REFERENCE"> |
| <h3>REFERENCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-62">REFERENCE</a></span></div> |
| <div class="block">Reference size is 8 bytes on 64-bit, 4 bytes on 32-bit</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="STRING"> |
| <h3>STRING</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-65">STRING</a></span></div> |
| <div class="block">String overhead</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="TREEMAP"> |
| <h3>TREEMAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-68">TREEMAP</a></span></div> |
| <div class="block">Overhead for TreeMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CONCURRENT_HASHMAP"> |
| <h3>CONCURRENT_HASHMAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-71">CONCURRENT_HASHMAP</a></span></div> |
| <div class="block">Overhead for ConcurrentHashMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CONCURRENT_HASHMAP_ENTRY"> |
| <h3>CONCURRENT_HASHMAP_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-74">CONCURRENT_HASHMAP_ENTRY</a></span></div> |
| <div class="block">Overhead for ConcurrentHashMap.Entry</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CONCURRENT_HASHMAP_SEGMENT"> |
| <h3>CONCURRENT_HASHMAP_SEGMENT</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-77">CONCURRENT_HASHMAP_SEGMENT</a></span></div> |
| <div class="block">Overhead for ConcurrentHashMap.Segment</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CONCURRENT_SKIPLISTMAP"> |
| <h3>CONCURRENT_SKIPLISTMAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-80">CONCURRENT_SKIPLISTMAP</a></span></div> |
| <div class="block">Overhead for ConcurrentSkipListMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CONCURRENT_SKIPLISTMAP_ENTRY"> |
| <h3>CONCURRENT_SKIPLISTMAP_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-83">CONCURRENT_SKIPLISTMAP_ENTRY</a></span></div> |
| <div class="block">Overhead for ConcurrentSkipListMap Entry</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_FLAT_MAP"> |
| <h3>CELL_FLAT_MAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-86">CELL_FLAT_MAP</a></span></div> |
| <div class="block">Overhead for CellFlatMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_CHUNK_MAP"> |
| <h3>CELL_CHUNK_MAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-89">CELL_CHUNK_MAP</a></span></div> |
| <div class="block">Overhead for CellChunkMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_CHUNK_MAP_ENTRY"> |
| <h3>CELL_CHUNK_MAP_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-92">CELL_CHUNK_MAP_ENTRY</a></span></div> |
| <div class="block">Overhead for Cell Chunk Map Entry</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_ARRAY_MAP"> |
| <h3>CELL_ARRAY_MAP</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-95">CELL_ARRAY_MAP</a></span></div> |
| <div class="block">Overhead for CellArrayMap</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_ARRAY_MAP_ENTRY"> |
| <h3>CELL_ARRAY_MAP_ENTRY</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-98">CELL_ARRAY_MAP_ENTRY</a></span></div> |
| <div class="block">Overhead for Cell Array Entry</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="REENTRANT_LOCK"> |
| <h3>REENTRANT_LOCK</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-101">REENTRANT_LOCK</a></span></div> |
| <div class="block">Overhead for ReentrantReadWriteLock</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ATOMIC_LONG"> |
| <h3>ATOMIC_LONG</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-104">ATOMIC_LONG</a></span></div> |
| <div class="block">Overhead for AtomicLong</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ATOMIC_INTEGER"> |
| <h3>ATOMIC_INTEGER</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-107">ATOMIC_INTEGER</a></span></div> |
| <div class="block">Overhead for AtomicInteger</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ATOMIC_BOOLEAN"> |
| <h3>ATOMIC_BOOLEAN</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-110">ATOMIC_BOOLEAN</a></span></div> |
| <div class="block">Overhead for AtomicBoolean</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ATOMIC_REFERENCE"> |
| <h3>ATOMIC_REFERENCE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-113">ATOMIC_REFERENCE</a></span></div> |
| <div class="block">Overhead for AtomicReference</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="COPYONWRITE_ARRAYSET"> |
| <h3>COPYONWRITE_ARRAYSET</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-116">COPYONWRITE_ARRAYSET</a></span></div> |
| <div class="block">Overhead for CopyOnWriteArraySet</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="COPYONWRITE_ARRAYLIST"> |
| <h3>COPYONWRITE_ARRAYLIST</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-119">COPYONWRITE_ARRAYLIST</a></span></div> |
| <div class="block">Overhead for CopyOnWriteArrayList</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="TIMERANGE"> |
| <h3>TIMERANGE</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-122">TIMERANGE</a></span></div> |
| <div class="block">Overhead for timerange</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="SYNC_TIMERANGE_TRACKER"> |
| <h3>SYNC_TIMERANGE_TRACKER</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-125">SYNC_TIMERANGE_TRACKER</a></span></div> |
| <div class="block">Overhead for SyncTimeRangeTracker</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="NON_SYNC_TIMERANGE_TRACKER"> |
| <h3>NON_SYNC_TIMERANGE_TRACKER</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-128">NON_SYNC_TIMERANGE_TRACKER</a></span></div> |
| <div class="block">Overhead for NonSyncTimeRangeTracker</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="CELL_SET"> |
| <h3>CELL_SET</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-131">CELL_SET</a></span></div> |
| <div class="block">Overhead for CellSkipListSet</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="STORE_SERVICES"> |
| <h3>STORE_SERVICES</h3> |
| <div class="member-signature"><span class="modifiers">public static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-133">STORE_SERVICES</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="memoryLayout"> |
| <h3>memoryLayout</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type"><a href="ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-235">memoryLayout</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="USE_UNSAFE_LAYOUT"> |
| <h3>USE_UNSAFE_LAYOUT</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-236">USE_UNSAFE_LAYOUT</a></span></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>ClassSize</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-34">ClassSize</a></span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getMemoryLayout()"> |
| <h3>getMemoryLayout</h3> |
| <div class="member-signature"><span class="modifiers">private static</span> <span class="return-type"><a href="ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-220">getMemoryLayout</a></span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="useUnsafeLayout()"> |
| <h3>useUnsafeLayout</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-238">useUnsafeLayout</a></span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getSizeCoefficients(java.lang.Class,boolean)"> |
| <h3>getSizeCoefficients</h3> |
| <div class="member-signature"><span class="modifiers">private static</span> <span class="return-type">int[]</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-349">getSizeCoefficients</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a> cl, |
| boolean debug)</span></div> |
| <div class="block">The estimate of the size of a class instance depends on whether the JVM uses 32 or 64 bit |
| addresses, that is it depends on the size of an object reference. It is a linear function of |
| the size of a reference, e.g. 24 + 5*r where r is the size of a reference (usually 4 or 8 |
| bytes). This method returns the coefficients of the linear function, e.g. {24, 5} in the above |
| example.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>cl</code> - A class whose instance size is to be estimated</dd> |
| <dd><code>debug</code> - debug flag</dd> |
| <dt>Returns:</dt> |
| <dd>an array of 3 integers. The first integer is the size of the primitives, the second the |
| number of arrays and the third the number of references.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="estimateBaseFromCoefficients(int[],boolean)"> |
| <h3>estimateBaseFromCoefficients</h3> |
| <div class="member-signature"><span class="modifiers">private static</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-398">estimateBaseFromCoefficients</a></span><wbr><span class="parameters">(int[] coeff, |
| boolean debug)</span></div> |
| <div class="block">Estimate the static space taken up by a class instance given the coefficients returned by |
| getSizeCoefficients.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>coeff</code> - the coefficients</dd> |
| <dd><code>debug</code> - debug flag</dd> |
| <dt>Returns:</dt> |
| <dd>the size estimate, in bytes</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="estimateBase(java.lang.Class,boolean)"> |
| <h3>estimateBase</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-421">estimateBase</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a> cl, |
| boolean debug)</span></div> |
| <div class="block">Estimate the static space taken up by the fields of a class. This includes the space taken up |
| by by references (the pointer) but not by the referenced object. So the estimated size of an |
| array field does not depend on the size of the array. Similarly the size of an object |
| (reference) field does not depend on the object.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>cl</code> - class</dd> |
| <dd><code>debug</code> - debug flag</dd> |
| <dt>Returns:</dt> |
| <dd>the size estimate in bytes.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="align(int)"> |
| <h3>align</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-431">align</a></span><wbr><span class="parameters">(int num)</span></div> |
| <div class="block">Aligns a number to 8.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>num</code> - number to align to 8</dd> |
| <dt>Returns:</dt> |
| <dd>smallest number >= input that is a multiple of 8</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="align(long)"> |
| <h3>align</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-440">align</a></span><wbr><span class="parameters">(long num)</span></div> |
| <div class="block">Aligns a number to 8.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>num</code> - number to align to 8</dd> |
| <dt>Returns:</dt> |
| <dd>smallest number >= input that is a multiple of 8</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="is32BitJVM()"> |
| <h3>is32BitJVM</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-447">is32BitJVM</a></span>()</div> |
| <div class="block">Determines if we are running in a 32-bit JVM. Some unit tests need to know this too.</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="sizeOf(byte[])"> |
| <h3>sizeOf</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-459">sizeOf</a></span><wbr><span class="parameters">(byte[] b)</span></div> |
| <div class="block">Calculate the memory consumption (in byte) of a byte array, including the array header and the |
| whole backing byte array. If the whole byte array is occupied (not shared with other objects), |
| please use this function. If not, please use <a href="#sizeOfByteArray(int)"><code>sizeOfByteArray(int)</code></a> instead.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>b</code> - the byte array</dd> |
| <dt>Returns:</dt> |
| <dd>the memory consumption (in byte) of the whole byte array</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="sizeOfByteArray(int)"> |
| <h3>sizeOfByteArray</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line-472">sizeOfByteArray</a></span><wbr><span class="parameters">(int len)</span></div> |
| <div class="block">Calculate the memory consumption (in byte) of a part of a byte array, including the array |
| header and the part of the backing byte array. This function is used when the byte array backs |
| multiple objects. For example, in <a href="../KeyValue.html" title="class in org.apache.hadoop.hbase"><code>KeyValue</code></a>, multiple KeyValue |
| objects share a same backing byte array (<a href="../KeyValue.html#bytes"><code>KeyValue.bytes</code></a>). Also |
| see <a href="../KeyValue.html#heapSize()"><code>KeyValue.heapSize()</code></a>.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>len</code> - the length (in byte) used partially in the backing byte array</dd> |
| <dt>Returns:</dt> |
| <dd>the memory consumption (in byte) of the part of the byte array</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
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