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| <h1 id="tasks-overview">Tasks Overview</h1> |
| |
| <p>Apache Druid (incubating) tasks are run on MiddleManagers and always operate on a single data source.</p> |
| |
| <p>Tasks are submitted using POST requests to the Overlord. Please see <a href="../operations/api-reference.html#overlord-tasks">Overlord Task API</a> for API details.</p> |
| |
| <p>There are several different types of tasks.</p> |
| |
| <h2 id="segment-creation-tasks">Segment Creation Tasks</h2> |
| |
| <h3 id="hadoop-index-task">Hadoop Index Task</h3> |
| |
| <p>See <a href="../ingestion/hadoop.html">batch ingestion</a>.</p> |
| |
| <h3 id="native-index-tasks">Native Index Tasks</h3> |
| |
| <p>Druid provides a native index task which doesn't need any dependencies on other systems. |
| See <a href="./native_tasks.html">native index tasks</a> for more details.</p> |
| |
| <div class="note info"> |
| Please check [Hadoop-based Batch Ingestion VS Native Batch Ingestion](./hadoop-vs-native-batch.html) for differences between native batch ingestion and Hadoop-based ingestion. |
| </div> |
| |
| <h3 id="kafka-indexing-tasks">Kafka Indexing Tasks</h3> |
| |
| <p>Kafka Indexing tasks are automatically created by a Kafka Supervisor and are responsible for pulling data from Kafka streams. These tasks are not meant to be created/submitted directly by users. See <a href="../development/extensions-core/kafka-ingestion.html">Kafka Indexing Service</a> for more details.</p> |
| |
| <h3 id="stream-push-tasks-tranquility">Stream Push Tasks (Tranquility)</h3> |
| |
| <p>Tranquility Server automatically creates "realtime" tasks that receive events over HTTP using an <a href="../ingestion/firehose.html#eventreceiverfirehose">EventReceiverFirehose</a>. These tasks are not meant to be created/submitted directly by users. See <a href="../ingestion/stream-push.html">Tranquility Stream Push</a> for more info.</p> |
| |
| <h2 id="compaction-tasks">Compaction Tasks</h2> |
| |
| <p>Compaction tasks merge all segments of the given interval. Please see <a href="../ingestion/compaction.html">Compaction</a> for details.</p> |
| |
| <h2 id="segment-merging-tasks">Segment Merging Tasks</h2> |
| |
| <div class="note info"> |
| The documentation for the Append Task, Merge Task, and Same Interval Merge Task has been moved to <a href="../ingestion/misc-tasks.html">Miscellaneous Tasks</a>. |
| </div> |
| |
| <h2 id="kill-task">Kill Task</h2> |
| |
| <p>Kill tasks delete all information about a segment and removes it from deep storage. </p> |
| |
| <p>Please see <a href="../ingestion/delete-data.html">Deleting Data</a> for details.</p> |
| |
| <h2 id="misc-tasks">Misc. Tasks</h2> |
| |
| <p>Please see <a href="../ingestion/misc-tasks.html">Miscellaneous Tasks</a>.</p> |
| |
| <h2 id="task-locking-and-priority">Task Locking and Priority</h2> |
| |
| <p>Please see <a href="../ingestion/locking-and-priority.html">Task Locking and Priority</a>.</p> |
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