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<strong>IMPORTANT</strong>: No additional bug fixes or documentation updates
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<h2 class="title"><a id="execution-model"></a>Execution Model<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/logstash/edit/7.0/docs/static/life-of-an-event.asciidoc">edit</a></h2>
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<p>The Logstash event processing pipeline coordinates the execution of inputs,
filters, and outputs.</p>
<p>Each input stage in the Logstash pipeline runs in its own thread. Inputs write
events to a central queue that is either in memory (default) or on disk. Each
pipeline worker thread takes a batch of events off this queue, runs the batch of
events through the configured filters, and then runs the filtered events through
any outputs. The size of the batch and number of pipeline worker threads are
configurable (see <a class="xref" href="tuning-logstash.html" title="Tuning and Profiling Logstash Performance">Tuning and Profiling Logstash Performance</a>).</p>
<p>By default, Logstash uses in-memory bounded queues between pipeline stages
(input → filter and filter → output) to buffer events. If Logstash terminates
unsafely, any events that are stored in memory will be lost. To help prevent data
loss, you can enable Logstash to persist in-flight events to disk. See
<a class="xref" href="persistent-queues.html" title="Persistent Queues">Persistent Queues</a> for more information.</p>
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