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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.iceberg.spark</a></div> |
| <h2 title="Class SparkExecutorCache" class="title">Class SparkExecutorCache</h2> |
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| <li>java.lang.Object</li> |
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| <li>org.apache.iceberg.spark.SparkExecutorCache</li> |
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| <pre>public class <span class="typeNameLabel">SparkExecutorCache</span> |
| extends java.lang.Object</pre> |
| <div class="block">An executor cache for reducing the computation and IO overhead in tasks. |
| |
| <p>The cache is configured and controlled through Spark SQL properties. It supports both limits |
| on the total cache size and maximum size for individual entries. Additionally, it implements |
| automatic eviction of entries after a specified duration of inactivity. The cache will respect |
| the SQL configuration valid at the time of initialization. All subsequent changes to the |
| configuration will have no effect. |
| |
| <p>The cache is accessed and populated via <a href="#getOrLoad(java.lang.String,java.lang.String,java.util.function.Supplier,long)"><code>getOrLoad(String, String, Supplier, long)</code></a>. If |
| the value is not present in the cache, it is computed using the provided supplier and stored in |
| the cache, subject to the defined size constraints. When a key is added, it must be associated |
| with a particular group ID. Once the group is no longer needed, it is recommended to explicitly |
| invalidate its state by calling <a href="#invalidate(java.lang.String)"><code>invalidate(String)</code></a> instead of relying on automatic |
| eviction. |
| |
| <p>Note that this class employs the singleton pattern to ensure only one cache exists per JVM.</div> |
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| <h3>Method Summary</h3> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="SparkExecutorCache.html" title="class in org.apache.iceberg.spark">SparkExecutorCache</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#get()">get</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the cache if already created or null otherwise.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="SparkExecutorCache.html" title="class in org.apache.iceberg.spark">SparkExecutorCache</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOrCreate()">getOrCreate</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the cache if created or creates and returns it.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><V> V</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getOrLoad(java.lang.String,java.lang.String,java.util.function.Supplier,long)">getOrLoad</a></span>​(java.lang.String group, |
| java.lang.String key, |
| java.util.function.Supplier<V> valueSupplier, |
| long valueSize)</code></th> |
| <td class="colLast"> |
| <div class="block">Gets the cached value for the key or populates the cache with a new mapping.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#invalidate(java.lang.String)">invalidate</a></span>​(java.lang.String group)</code></th> |
| <td class="colLast"> |
| <div class="block">Invalidates all keys associated with the given group ID.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#maxEntrySize()">maxEntrySize</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the max entry size in bytes that will be considered for caching.</div> |
| </td> |
| </tr> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h4>getOrCreate</h4> |
| <pre class="methodSignature">public static <a href="SparkExecutorCache.html" title="class in org.apache.iceberg.spark">SparkExecutorCache</a> getOrCreate()</pre> |
| <div class="block">Returns the cache if created or creates and returns it. |
| |
| <p>Note this method returns null if caching is disabled.</div> |
| </li> |
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| <a id="get()"> |
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| <h4>get</h4> |
| <pre class="methodSignature">public static <a href="SparkExecutorCache.html" title="class in org.apache.iceberg.spark">SparkExecutorCache</a> get()</pre> |
| <div class="block">Returns the cache if already created or null otherwise.</div> |
| </li> |
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| <h4>maxEntrySize</h4> |
| <pre class="methodSignature">public long maxEntrySize()</pre> |
| <div class="block">Returns the max entry size in bytes that will be considered for caching.</div> |
| </li> |
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| <h4>getOrLoad</h4> |
| <pre class="methodSignature">public <V> V getOrLoad​(java.lang.String group, |
| java.lang.String key, |
| java.util.function.Supplier<V> valueSupplier, |
| long valueSize)</pre> |
| <div class="block">Gets the cached value for the key or populates the cache with a new mapping.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>group</code> - a group ID</dd> |
| <dd><code>key</code> - a cache key</dd> |
| <dd><code>valueSupplier</code> - a supplier to compute the value</dd> |
| <dd><code>valueSize</code> - an estimated memory size of the value in bytes</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the cached or computed value</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>invalidate</h4> |
| <pre class="methodSignature">public void invalidate​(java.lang.String group)</pre> |
| <div class="block">Invalidates all keys associated with the given group ID.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>group</code> - a group ID</dd> |
| </dl> |
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