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| <pre>public interface <span class="typeNameLabel">State</span></pre> |
| <div class="block"><p>There’s 3 different kinds of state:</p><p><p>1. non-transactional: ignores commits, updates are permanent. no rollback. a cassandra incrementing state would be like this 2. repeat-transactional: idempotent as long as all batches for a txid are identical 3. opaque-transactional: the most general kind of state. updates are always done based on the previous version of the value if the current commit = latest stored commit Idempotent even if the batch for a txid can change.</p><p><p>repeat transactional is idempotent for transactional spouts opaque transactional is idempotent for opaque or transactional spouts</p><p><p>Trident should log warnings when state is idempotent but updates will not be idempotent because of spout</p></div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/trident/state/State.html#beginCommit-java.lang.Long-">beginCommit</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a> txid)</code> </td> |
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