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| <div class="subTitle">org.apache.hadoop.hbase.util</div> |
| <h2 title="Class ClassSize" class="title">Class ClassSize</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line.40">ClassSize</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></pre> |
| <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> |
| </li> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></span></code> |
| <div class="block">MemoryLayout abstracts details about the JVM object layout.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.UnsafeLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.UnsafeLayout</a></span></code> |
| <div class="block">UnsafeLayout uses Unsafe to guesstimate the object-layout related parameters like object header |
| sizes and oop sizes |
| See HBASE-15950.</div> |
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| </tr> |
| </table> |
| </li> |
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| <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>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ARRAY">ARRAY</a></span></code> |
| <div class="block">Array overhead</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ARRAYLIST">ARRAYLIST</a></span></code> |
| <div class="block">Overhead for ArrayList(0)</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ATOMIC_BOOLEAN">ATOMIC_BOOLEAN</a></span></code> |
| <div class="block">Overhead for AtomicBoolean</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ATOMIC_INTEGER">ATOMIC_INTEGER</a></span></code> |
| <div class="block">Overhead for AtomicInteger</div> |
| </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ATOMIC_LONG">ATOMIC_LONG</a></span></code> |
| <div class="block">Overhead for AtomicLong</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ATOMIC_REFERENCE">ATOMIC_REFERENCE</a></span></code> |
| <div class="block">Overhead for AtomicReference</div> |
| </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/util/ClassSize.html#BYTE_BUFFER">BYTE_BUFFER</a></span></code> |
| <div class="block">Overhead for ByteBuffer</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CELL_ARRAY_MAP">CELL_ARRAY_MAP</a></span></code> |
| <div class="block">Overhead for CellArrayMap</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CELL_ARRAY_MAP_ENTRY">CELL_ARRAY_MAP_ENTRY</a></span></code> |
| <div class="block">Overhead for Cell Array Entry</div> |
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| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CELL_CHUNK_MAP">CELL_CHUNK_MAP</a></span></code> |
| <div class="block">Overhead for CellChunkMap</div> |
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| </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/util/ClassSize.html#CELL_CHUNK_MAP_ENTRY">CELL_CHUNK_MAP_ENTRY</a></span></code> |
| <div class="block">Overhead for Cell Chunk Map Entry</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CELL_FLAT_MAP">CELL_FLAT_MAP</a></span></code> |
| <div class="block">Overhead for CellFlatMap</div> |
| </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/util/ClassSize.html#CELL_SET">CELL_SET</a></span></code> |
| <div class="block">Overhead for CellSkipListSet</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CONCURRENT_HASHMAP">CONCURRENT_HASHMAP</a></span></code> |
| <div class="block">Overhead for ConcurrentHashMap</div> |
| </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/util/ClassSize.html#CONCURRENT_HASHMAP_ENTRY">CONCURRENT_HASHMAP_ENTRY</a></span></code> |
| <div class="block">Overhead for ConcurrentHashMap.Entry</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CONCURRENT_HASHMAP_SEGMENT">CONCURRENT_HASHMAP_SEGMENT</a></span></code> |
| <div class="block">Overhead for ConcurrentHashMap.Segment</div> |
| </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/util/ClassSize.html#CONCURRENT_SKIPLISTMAP">CONCURRENT_SKIPLISTMAP</a></span></code> |
| <div class="block">Overhead for ConcurrentSkipListMap</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#CONCURRENT_SKIPLISTMAP_ENTRY">CONCURRENT_SKIPLISTMAP_ENTRY</a></span></code> |
| <div class="block">Overhead for ConcurrentSkipListMap Entry</div> |
| </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/util/ClassSize.html#COPYONWRITE_ARRAYLIST">COPYONWRITE_ARRAYLIST</a></span></code> |
| <div class="block">Overhead for CopyOnWriteArrayList</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#COPYONWRITE_ARRAYSET">COPYONWRITE_ARRAYSET</a></span></code> |
| <div class="block">Overhead for CopyOnWriteArraySet</div> |
| </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/util/ClassSize.html#INTEGER">INTEGER</a></span></code> |
| <div class="block">Overhead for an Integer</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#LINKEDLIST">LINKEDLIST</a></span></code> |
| <div class="block">Overhead for LinkedList(0)</div> |
| </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/util/ClassSize.html#LINKEDLIST_ENTRY">LINKEDLIST_ENTRY</a></span></code> |
| <div class="block">Overhead for a single entry in LinkedList</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#LOG">LOG</a></span></code> </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/util/ClassSize.html#MAP_ENTRY">MAP_ENTRY</a></span></code> |
| <div class="block">Overhead for entry in map</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static <a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.MemoryLayout.html" title="class in org.apache.hadoop.hbase.util">ClassSize.MemoryLayout</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#memoryLayout">memoryLayout</a></span></code> </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/util/ClassSize.html#NON_SYNC_TIMERANGE_TRACKER">NON_SYNC_TIMERANGE_TRACKER</a></span></code> |
| <div class="block">Overhead for NonSyncTimeRangeTracker</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#OBJECT">OBJECT</a></span></code> |
| <div class="block">Object overhead is minimum 2 * reference size (8 bytes on 64-bit)</div> |
| </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/util/ClassSize.html#REENTRANT_LOCK">REENTRANT_LOCK</a></span></code> |
| <div class="block">Overhead for ReentrantReadWriteLock</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#REFERENCE">REFERENCE</a></span></code> |
| <div class="block">Reference size is 8 bytes on 64-bit, 4 bytes on 32-bit</div> |
| </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/util/ClassSize.html#STORE_SERVICES">STORE_SERVICES</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#STRING">STRING</a></span></code> |
| <div class="block">String overhead</div> |
| </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/util/ClassSize.html#SYNC_TIMERANGE_TRACKER">SYNC_TIMERANGE_TRACKER</a></span></code> |
| <div class="block">Overhead for SyncTimeRangeTracker</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#TIMERANGE">TIMERANGE</a></span></code> |
| <div class="block">Overhead for timerange</div> |
| </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/util/ClassSize.html#TREEMAP">TREEMAP</a></span></code> |
| <div class="block">Overhead for TreeMap</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#USE_UNSAFE_LAYOUT">USE_UNSAFE_LAYOUT</a></span></code> </td> |
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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"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#ClassSize--">ClassSize</a></span>()</code> </td> |
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| <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"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </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>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#align-int-">align</a></span>(int num)</code> |
| <div class="block">Aligns a number to 8.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#align-long-">align</a></span>(long num)</code> |
| <div class="block">Aligns a number to 8.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/ClassSize.html#estimateBase-java.lang.Class-boolean-">estimateBase</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> cl, |
| boolean debug)</code> |
| <div class="block">Estimate the static space taken up by the fields of a class.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
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| <dd><code>debug</code> - debug flag</dd> |
| <dt><span class="returnLabel">Returns:</span></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> |
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| <pre>private static long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line.412">estimateBaseFromCoefficients</a>(int[] coeff, |
| boolean debug)</pre> |
| <div class="block">Estimate the static space taken up by a class instance given the |
| coefficients returned by getSizeCoefficients.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>coeff</code> - the coefficients</dd> |
| <dd><code>debug</code> - debug flag</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the size estimate, in bytes</dd> |
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| <pre>public static long <a href="../../../../../src-html/org/apache/hadoop/hbase/util/ClassSize.html#line.439">estimateBase</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a> cl, |
| boolean debug)</pre> |
| <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> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>cl</code> - class</dd> |
| <dd><code>debug</code> - debug flag</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the size estimate in bytes.</dd> |
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| <div class="block">Aligns a number to 8.</div> |
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| <dd><code>num</code> - number to align to 8</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>smallest number >= input that is a multiple of 8</dd> |
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| <div class="block">Aligns a number to 8.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>num</code> - number to align to 8</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>smallest number >= input that is a multiple of 8</dd> |
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| <div class="block">Determines if we are running in a 32-bit JVM. Some unit tests need to |
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| <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. |
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| <dd><code>b</code> - the byte array</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the memory consumption (in byte) of the whole byte array</dd> |
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| <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. |
| |
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| For example, in <a href="../../../../../org/apache/hadoop/hbase/KeyValue.html" title="class in org.apache.hadoop.hbase"><code>KeyValue</code></a>, |
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| Also see <a href="../../../../../org/apache/hadoop/hbase/KeyValue.html#heapSize--"><code>KeyValue.heapSize()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>len</code> - the length (in byte) used partially in the backing byte array</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the memory consumption (in byte) of the part of the byte array</dd> |
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