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| <div class="subTitle">org.apache.ignite.cache</div> |
| <h2 title="Enum CacheAtomicityMode" class="title">Enum CacheAtomicityMode</h2> |
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| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a><span class='angle_bracket'>></span></li> |
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| <li>org.apache.ignite.cache.CacheAtomicityMode</li> |
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| <pre>public enum <span class="typeNameLabel">CacheAtomicityMode</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><span class='angle_bracket'><</span><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a><span class='angle_bracket'>></span></pre> |
| <div class="block">Cache atomicity mode controls whether cache should maintain fully transactional semantics |
| or more light-weight atomic behavior. It is recommended that <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#ATOMIC"><code>ATOMIC</code></a> mode is |
| used whenever transactions and explicit locking are not needed. Note that in <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#ATOMIC"><code>ATOMIC</code></a> |
| mode cache will still maintain full data consistency across all cache nodes. |
| <p> |
| Cache atomicity may be set via <a href="../../../../org/apache/ignite/configuration/CacheConfiguration.html#getAtomicityMode--"><code>CacheConfiguration.getAtomicityMode()</code></a> |
| configuration property.</div> |
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| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#ATOMIC">ATOMIC</a></span></code> |
| <div class="block">Specifies atomic-only cache behaviour.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#TRANSACTIONAL">TRANSACTIONAL</a></span></code> |
| <div class="block">Enables fully <code>ACID</code>-compliant transactional cache behavior for the key-value API.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#TRANSACTIONAL_SNAPSHOT">TRANSACTIONAL_SNAPSHOT</a></span></code> |
| <div class="block"><b>This is an experimental feature.</div> |
| </td> |
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| <td class="colFirst"><code>static @Nullable <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#fromOrdinal-int-">fromOrdinal</a></span>(int ord)</code> |
| <div class="block">Efficiently gets enumerated value from its ordinal.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#valueOf-java.lang.String-">valueOf</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h3>Enum Constant Detail</h3> |
| <a name="TRANSACTIONAL"> |
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| <h4>TRANSACTIONAL</h4> |
| <pre>public static final <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a> TRANSACTIONAL</pre> |
| <div class="block">Enables fully <code>ACID</code>-compliant transactional cache behavior for the key-value API. |
| <p> |
| <b>Note!</b> In this mode, transactional consistency is guaranteed for key-value API operations only. |
| To enable ACID capabilities for SQL transactions, use the <code>TRANSACTIONAL_SNAPSHOT</code> mode. |
| <p> |
| <b>Note!</b> This atomicity mode is not compatible with the other modes within the same transaction. |
| if a transaction is executed over multiple caches, all caches must have the same atomicity mode, |
| either <code>TRANSACTIONAL_SNAPSHOT</code> or <code>TRANSACTIONAL</code>. |
| <p> |
| See <a href="../../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions"><code>Transaction</code></a> for more information about transactions.</div> |
| </li> |
| </ul> |
| <a name="ATOMIC"> |
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| <h4>ATOMIC</h4> |
| <pre>public static final <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a> ATOMIC</pre> |
| <div class="block">Specifies atomic-only cache behaviour. In this mode distributed transactions and distributed |
| locking are not supported. Disabling transactions and locking allows to achieve much higher |
| performance and throughput ratios. |
| <p> |
| In addition to transactions and locking, one of the main differences in <code>ATOMIC</code> mode |
| is that bulk writes, such as <code>putAll(...)</code>, <code>removeAll(...)</code>, and <code>transformAll(...)</code> |
| methods, become simple batch operations which can partially fail. In case of partial |
| failure <a href="../../../../org/apache/ignite/cache/CachePartialUpdateException.html" title="class in org.apache.ignite.cache"><code>CachePartialUpdateException</code></a> will be thrown |
| which will contain a list of keys for which the update failed. It is recommended that bulk writes are used |
| whenever multiple keys need to be inserted or updated in cache, as they reduce number of network trips and |
| provide better performance. |
| <p> |
| Note that even without locking and transactions, <code>ATOMIC</code> mode makes best effort to provide |
| full consistency guarantees across all cache nodes. However, in following scenarios (but not limited to) |
| full consistency is not possible and <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html#TRANSACTIONAL"><code>TRANSACTIONAL</code></a> mode should be used or custom defined recovery |
| logic should be applied to restore data consistency: |
| <ul> |
| <li> |
| Node that originated update has left together with at least one primary node |
| for this update operation, and left primary node has not finished update propagation |
| to all nodes holding backup partitions. This way backup copies may differ. And also if |
| persistent store is configured it may come to an inconsistent state as well. |
| </li> |
| <li> |
| If update originating node is alive then update is retried by default and for operations |
| <code>put(...)</code>, <code>putAll(...)</code>, <code>remove(K, V)</code> and <code>removeAll(Set<span class='angle_bracket'><</span>K<span class='angle_bracket'>></span>)</code> |
| all copies of partitions will come to a consistent state. |
| </li> |
| <li> |
| If <code>EntryProcessor</code> is used and processor is not idempotent then failure of primary node |
| may result in applying the same processor on next chosen primary which may have already been |
| updated within current operation. If processor is not idempotent it is recommended to disable |
| automatic retries and manually restore consistency between key-value copies in case of update failure. |
| </li> |
| <li> |
| For operations <code>putIfAbsent(K, V)</code>, <code>replace(K, V, V)</code> and <code>remove(K, V)</code> return |
| value on primary node crash may be incorrect because of the automatic retries. It is recommended |
| to disable retries with <a href="../../../../org/apache/ignite/IgniteCache.html#withNoRetries--"><code>IgniteCache.withNoRetries()</code></a> and manually restore primary-backup |
| consistency in case of update failure. |
| </li> |
| </ul> |
| <p> |
| Also note that all data modifications in <code>ATOMIC</code> mode are guaranteed to be atomic |
| and consistent with writes to the underlying persistent store, if one is configured. |
| <p> |
| Note! Consistency behavior of atomic cache will be improved in future releases.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/ignite/IgniteCache.html#withNoRetries--"><code>IgniteCache.withNoRetries()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="TRANSACTIONAL_SNAPSHOT"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>TRANSACTIONAL_SNAPSHOT</h4> |
| <pre>public static final <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a> TRANSACTIONAL_SNAPSHOT</pre> |
| <div class="block"><b>This is an experimental feature. Transactional SQL is currently in a beta status.</b> |
| <p> |
| Specifies fully <code>ACID</code>-compliant transactional cache behavior for both key-value API and SQL transactions. |
| <p> |
| This atomicity mode enables multiversion concurrency control (MVCC) for the cache. In MVCC-enabled caches, |
| when a transaction updates a row, it creates a new version of that row instead of overwriting it. |
| Other users continue to see the old version of the row until the transaction is committed. |
| In this way, readers and writers do not conflict with each other and always work with a consistent dataset. |
| The old version of data is cleaned up when it's no longer accessed by anyone. |
| <p> |
| With this mode enabled, one node is elected as an MVCC coordinator. This node tracks all in-flight transactions |
| and queries executed in the cluster. Each transaction or query executed over the cache with |
| <code>TRANSACTIONAL_SNAPSHOT</code> mode works with a current snapshot of data generated for this transaction or query |
| by the coordinator. This snapshot ensures that the transaction works with a consistent database state |
| during its execution period. |
| <p> |
| <b>Note!</b> This atomicity mode is not compatible with the other modes within the same transaction. |
| If a transaction is executed over multiple caches, all caches must have the same atomicity mode, |
| either <code>TRANSACTIONAL_SNAPSHOT</code> or <code>TRANSACTIONAL</code>. |
| <p> |
| See <a href="../../../../org/apache/ignite/transactions/Transaction.html" title="interface in org.apache.ignite.transactions"><code>Transaction</code></a> for more information about transactions.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
| <a name="values--"> |
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| <h4>values</h4> |
| <pre>public static <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (CacheAtomicityMode c : CacheAtomicityMode.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="valueOf-java.lang.String-"> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a> valueOf(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>fromOrdinal</h4> |
| <pre>@Nullable |
| public static @Nullable <a href="../../../../org/apache/ignite/cache/CacheAtomicityMode.html" title="enum in org.apache.ignite.cache">CacheAtomicityMode</a> fromOrdinal(int ord)</pre> |
| <div class="block">Efficiently gets enumerated value from its ordinal.</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>ord</code> - Ordinal value.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Enumerated value or <code>null</code> if ordinal out of range.</dd> |
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