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arhimondr merged 1 commit into from
May 5, 2022
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Update writer scaling documentation #12261

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11 changes: 5 additions & 6 deletions docs/src/main/sphinx/admin/properties-writer-scaling.rst
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Expand Up @@ -2,11 +2,10 @@
Writer scaling properties
=========================

By default, the number of writer tasks is static. Enabling writer scaling allows
Trino to dynamically scale out the number of writer tasks rather than
allocating a fixed number of tasks. Additional tasks are added when the average
amount of physical data per writer is above a minimum threshold, but only if the
query is bottlenecked on writing.
Writer scaling allows Trino to dynamically scale out the number of writer tasks
rather than allocating a fixed number of tasks. Additional tasks are added when
the average amount of physical data per writer is above a minimum threshold, but
only if the query is bottlenecked on writing.

Writer scaling is useful with connectors like Hive that produce one or more
files per writer -- reducing the number of writers results in a larger average
Expand All @@ -18,7 +17,7 @@ the needs of the query.
^^^^^^^^^^^^^^^^^

* **Type:** :ref:`prop-type-boolean`
* **Default value:** ``false``
* **Default value:** ``true``

Enable writer scaling. This can be specified on a per-query basis
using the ``scale_writers`` session property.
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