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| <pre>public interface <span class="typeNameLabel">Callback</span></pre> |
| <div class="block">A callback interface that the user can implement to allow code to execute when the request is complete. This callback |
| will generally execute in the background I/O thread so it should be fast.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/kafka/clients/producer/Callback.html#onCompletion-org.apache.kafka.clients.producer.RecordMetadata-java.lang.Exception-">onCompletion</a></span>(<a href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html" title="class in org.apache.kafka.clients.producer">RecordMetadata</a> metadata, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a> exception)</code> |
| <div class="block">A callback method the user can implement to provide asynchronous handling of request completion.</div> |
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| <h4>onCompletion</h4> |
| <pre>void onCompletion(<a href="../../../../../org/apache/kafka/clients/producer/RecordMetadata.html" title="class in org.apache.kafka.clients.producer">RecordMetadata</a> metadata, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a> exception)</pre> |
| <div class="block">A callback method the user can implement to provide asynchronous handling of request completion. This method will |
| be called when the record sent to the server has been acknowledged. When exception is not null in the callback, |
| metadata will contain the special -1 value for all fields except for topicPartition, which will be valid.</div> |
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| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>metadata</code> - The metadata for the record that was sent (i.e. the partition and offset). An empty metadata |
| with -1 value for all fields except for topicPartition will be returned if an error occurred.</dd> |
| <dd><code>exception</code> - The exception thrown during processing of this record. Null if no error occurred. |
| Possible thrown exceptions include: |
| |
| Non-Retriable exceptions (fatal, the message will never be sent): |
| |
| InvalidTopicException |
| OffsetMetadataTooLargeException |
| RecordBatchTooLargeException |
| RecordTooLargeException |
| UnknownServerException |
| UnknownProducerIdException |
| InvalidProducerEpochException |
| |
| Retriable exceptions (transient, may be covered by increasing #.retries): |
| |
| CorruptRecordException |
| InvalidMetadataException |
| NotEnoughReplicasAfterAppendException |
| NotEnoughReplicasException |
| OffsetOutOfRangeException |
| TimeoutException |
| UnknownTopicOrPartitionException</dd> |
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