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| <h2 title="Class LRUDictionary" class="title">Class LRUDictionary</h2> |
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| <li>org.apache.hadoop.hbase.io.util.LRUDictionary</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.40">LRUDictionary</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/util/Dictionary.html" title="interface in org.apache.hadoop.hbase.io.util">Dictionary</a></pre> |
| <div class="block">WALDictionary using an LRU eviction algorithm. Uses a linked list running |
| through a hashtable. Currently has max of 2^15 entries. Will start |
| evicting if exceeds this number The maximum memory we expect this dictionary |
| to take in the worst case is about: |
| <code>(2 ^ 15) * 5 (Regionname, Row key, CF, Column qual, table) * 100 bytes |
| (these are some big names) = ~16MB</code>. |
| If you want to get silly, even at 1kb entries, it maxes out at 160 megabytes.</div> |
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| <td class="colFirst"><code>(package private) static class </code></td> |
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| <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.BidirectionalLRUMap.html" title="class in org.apache.hadoop.hbase.io.util">LRUDictionary.BidirectionalLRUMap</a></code></td> |
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| <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#NOT_IN_DICTIONARY">NOT_IN_DICTIONARY</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#LRUDictionary--">LRUDictionary</a></span>()</code> </td> |
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| <td class="colFirst"><code>short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#addEntry-byte:A-int-int-">addEntry</a></span>(byte[] data, |
| int offset, |
| int length)</code> |
| <div class="block">Adds an entry to the dictionary.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>private short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#addEntryInternal-byte:A-int-int-boolean-">addEntryInternal</a></span>(byte[] data, |
| int offset, |
| int length, |
| boolean copy)</code> </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#clear--">clear</a></span>()</code> |
| <div class="block">Flushes the dictionary, empties all values.</div> |
| </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#findEntry-byte:A-int-int-">findEntry</a></span>(byte[] data, |
| int offset, |
| int length)</code> |
| <div class="block">Finds the index of an entry.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>short</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#findEntry-java.nio.ByteBuffer-int-int-">findEntry</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> data, |
| int offset, |
| int length)</code> |
| <div class="block">Finds the index of an entry.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#getEntry-short-">getEntry</a></span>(short idx)</code> |
| <div class="block">Gets an entry from the dictionary.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/util/LRUDictionary.html#init-int-">init</a></span>(int initialSize)</code> </td> |
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| <h4>getEntry</h4> |
| <pre>public byte[] <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.44">getEntry</a>(short idx)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#getEntry-short-">Dictionary</a></code></span></div> |
| <div class="block">Gets an entry from the dictionary.</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>idx</code> - index of the entry</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the entry, or null if non existent</dd> |
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| <h4>findEntry</h4> |
| <pre>public short <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.53">findEntry</a>(byte[] data, |
| int offset, |
| int length)</pre> |
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| <div class="block">Finds the index of an entry. |
| If no entry found, we add it.</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - the byte array that we're looking up</dd> |
| <dd><code>offset</code> - Offset into <code>data</code> to add to Dictionary.</dd> |
| <dd><code>length</code> - Length beyond <code>offset</code> that comprises entry; must be > 0.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the index of the entry, or <a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#NOT_IN_DICTIONARY"><code>Dictionary.NOT_IN_DICTIONARY</code></a> if not found</dd> |
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| <h4>addEntry</h4> |
| <pre>public short <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.62">addEntry</a>(byte[] data, |
| int offset, |
| int length)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#addEntry-byte:A-int-int-">Dictionary</a></code></span></div> |
| <div class="block">Adds an entry to the dictionary. |
| Be careful using this method. It will add an entry to the |
| dictionary even if it already has an entry for the same data. |
| Call {<a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#findEntry-byte:A-int-int-"><code>Dictionary.findEntry(byte[], int, int)</code></a>} to add without duplicating |
| dictionary entries.</div> |
| <dl> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - the entry to add</dd> |
| <dd><code>offset</code> - Offset into <code>data</code> to add to Dictionary.</dd> |
| <dd><code>length</code> - Length beyond <code>offset</code> that comprises entry; must be > 0.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the index of the entry</dd> |
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| <h4>addEntryInternal</h4> |
| <pre>private short <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.66">addEntryInternal</a>(byte[] data, |
| int offset, |
| int length, |
| boolean copy)</pre> |
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| <a name="clear--"> |
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| <h4>clear</h4> |
| <pre>public void <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.72">clear</a>()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#clear--">Dictionary</a></code></span></div> |
| <div class="block">Flushes the dictionary, empties all values.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#clear--">clear</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html" title="interface in org.apache.hadoop.hbase.io.util">Dictionary</a></code></dd> |
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| <h4>findEntry</h4> |
| <pre>public short <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/util/LRUDictionary.html#line.315">findEntry</a>(<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> data, |
| int offset, |
| int length)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#findEntry-java.nio.ByteBuffer-int-int-">Dictionary</a></code></span></div> |
| <div class="block">Finds the index of an entry. |
| If no entry found, we add it.</div> |
| <dl> |
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| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#findEntry-java.nio.ByteBuffer-int-int-">findEntry</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html" title="interface in org.apache.hadoop.hbase.io.util">Dictionary</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - the ByteBuffer that we're looking up</dd> |
| <dd><code>offset</code> - Offset into <code>data</code> to add to Dictionary.</dd> |
| <dd><code>length</code> - Length beyond <code>offset</code> that comprises entry; must be > 0.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the index of the entry, or <a href="../../../../../../org/apache/hadoop/hbase/io/util/Dictionary.html#NOT_IN_DICTIONARY"><code>Dictionary.NOT_IN_DICTIONARY</code></a> if not found</dd> |
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